The morphology of nanoscale materials such as the size and the shape of the nanoparticles and nanocrystals can dramatically affect their properties. Research on nanoscale materials is motivated by the observation that materials, previously only known in their bulk phase, show a significant change in physical and chemical properties or even exhibit novel phenomena at the nanoscale due to a high surface-to-volume ratio and finite size effects. The thorough characterization and understanding of these properties in interplay with nanoscopic length scales will ultimately guide the way to the exploitation of these effects in applications, including high density storage media and biomedical materials. The group of nanoscale chemistry is focusing on the synthesis of inorganic, organic, and hybrid nanomaterials. For instance, we develop new methods to synthesize single-crystalline inorganic nanowires and nanocrystals directly inside the carbon nanotubes. On even a smaller scale, single metal ions and small clusters are encapsulated inside fullerenes during their formation in arc-discharge synthesis forming endohedral fullerenes. Carbon nanostructures in such hybrid materials act not only as templating matrices but also as protecting shields stabilizing the nanosized forms of inorganic materials. Unique electronic, transport, and magnetic properties of these hybrid heterostructures are achieved due to nanosize of encapsulated structures and the interface effects at the boundary with the carbon π-system are then studied in close cooperation with other groups of IFW. Reducing only one dimension to nanoscopic length scale we have to consider ultrathin layers of the materials. The charge carrier densities of ultrathin layers which are part of an electric double layer can be influenced strongly by applying an electrochemical potential. Our aim is to investigate how huge charge carrier densities will influence the electric and magnetic properties of appropriate materials.
The empty space inside the fullerene cage can be filled with atom, ions, clusters, or even small molecules. The fullerenes with encapsulated species are called endohedral fullerenes. Particular focus of our work is the synthesis of endohedral metallofullerenes (EMFs) with different clusters. The group in IFW Dresden pioneered in the development of the reactive atmosphere method, in which NH3 or CH4 gases are used as a source of nitrogen or hydrogen in the arc-discharge synthesis of EMF. More recent developments include the use of solid nitrogen-containing organic compounds as the sources of nitrogen. Reaction atmosphere method results in the dramatic suppression of the empty fullerene formation, leading to EMFs as the main fullerene products. We are also looking for new types of EMFs, which led to the discovery of such clusterfullerenes as Sc3CH@C80, Sc2S@C82, or TiLu2C@C80. Encapsulation of metal atoms within the carbon-based π-system results in a variety of unprecedented chemical and physical properties of EMFs. In IFW Dresden we are specifically focused on the electron-transfer mechanism in EMFs as studied by electrochemistry and spectroelectrochemistry, and on the magnetic properties of lanthanide-based EMFs, including their single molecule magnetism. Experimental studies are accompanied by quantum-chemical calculations of molecular structure, spectroscopic properties, and spin states.
Group Leader: Dr. Alexey Popov
Phone: +49 351 4659 871
Email
Syhthesis of EMFs and single-crystal X-ray diffraction: Dr. Fupin Liu
Phone: +49 351 4659 1130
Email
Computational studies of static and dynamic properties: Dr. Stanislav Avdoshenko
Phone: +49 351 4659 1130
Email
Dr. Alexey A. Popov (Group leader)
Dr. Fupin Liu, head of the group "Synthesis and properties"
Dr. Stanislav Avdoshenko, head of the group"Computational studies"
PhD Students
Yaofeng Wang
Synthesis of EMFs and derivatives
Wei Yang
Synthesis of EMFs and derivatives
Vasilii Dubrovin
Quantum chemical calculations
Georgios Velkos
Magnetometry, XMCD
Emmanouil Koutsouflakis
Scanning tunneling microscopy
Technicians
Alex Beger
Sandra Schiemenz
Frank Ziegs
Recent Alumni and Visitors
Dr. Lukas Spree, PhD student (defense in July 2020)
Victor Nekrasov, visiting PhD student (Moscow State University, 2019)
Yajuan Hao, visiting PhD student (Soochow University, 2018-2019)
Dr. Peter Machata, Postdoc (till 09.2019)
Svetlana Sudarkova, visiting PhD student (Moscow State University, 2018 and 2019)
Jimmy Kuo, visiting student (2-months DAAD Fellowship in 2018)
Dr. Christin Schlesier, PhD student (defense in November 2018)
Dr. Ariane Brandenburg, PhD student (defense in September 2018)
Dr. Chia-Hsiang Chen, Postdoc (till 07.2018)
Dr. Denis Krylov, PhD student (defense in June 2017)
Dr. Nataliya Samoylova, PhD student (defense in September 2017)
Dr. Katrin Junghans, PhD student (defense in May 2017)
Dr. Qingming Deng, PhD student (defense in May 2016)
Metallofullerene photoswitches driven by photoinduced fullerene-to-metal electron transfer.
M. Zalibera, F. Ziegs, S. Schiemenz, V. Dubrovin, W. Lubitz, A. Savitsky, S. Deng, X.-B. Wang, S. Avdoshenko, A. A. Popov.
Chem. Sci.2021, 12, 7818-7838. DOI: 10.1039/D0SC07045A
Magnetic hysteresis at 10 K in single molecule magnet self-assembled on gold
C.-H. Chen, L. Spree, E. Koutsouflakis, D. S. Krylov, F. Liu, A. Brandenburg, G. Velkos, S. Schimmel, S. M. Avdoshenko, A. Fedorov, E. Weschke, F. Choueikani, P. Ohresser, J. Dreiser, B. Büchner, A. A. Popov.
Adv. Sci.2021, 8 (5), 2000777. DOI: 10.1002/advs.202000777
Caught in Phase Transition: Snapshot of the Metallofullerene Sc3N@C70 Rotation in the Crystal
Y. Hao, Y. Wang, V. Dubrovin, S. M. Avdoshenko, A. A. Popov, F. Liu.
J. Am. Chem. Soc.2021, 143 (2), 612–616.DOI: 10.1021/jacs.0c10758
Substrate‐independent magnetic bistability in monolayers of single molecule magnet Dy2ScN@C80 on metals and insulator
D. S. Krylov, S. Schimmel, V. Dubrovin, F. Liu, T. T. N. Nguyen, L. Spree, C.-H. Chen, G. Velkos, C. Bulbucan, R. Westerström, M. Studniarek, J. Dreiser, C. Hess, B. Büchner, S. M. Avdoshenko, A. A. Popov
Angew. Chem. Int. Ed. 2020, 59 (14), 5756-5764. DOI: 10.1002/anie.201913955
Air-stable redox-active nanomagnets with lanthanide spins radical-bridged by a metal-metal bond
F. Liu, G. Velkos, D. S. Krylov, L. Spree, M. Zalibera, R. Ray, N. A. Samoylova, C.-H. Chen, M. Rosenkranz, S. Schiemenz, F. Ziegs, K. Nenkov, A. Kostanyan, T. Greber, A. U. B. Wolter, M. Richter, B. Büchner, S. M. Avdoshenko, A. A. Popov
Nat. Commun. 2019, 10, 571. DOI: 10.1038/s41467-019-08513-6
Single-electron lanthanide-lanthanide bonds inside fullerenes toward robust redox-active molecular magnets
F. Liu, L. Spree, D. S. Krylov, G. Velkos, S. M. Avdoshenko, A. A. Popov
Acc. Chem. Res. 2019, 52 (10), 2981-2993. DOI: 10.1021/acs.accounts.9b00373
Single molecule magnetism with strong magnetic anisotropy and enhanced Dy∙∙∙Dy coupling in three isomers of Dy-oxide clusterfullerene Dy2O@C82
W. Yang, G. Velkos, F. Liu, S. M. Sudarkova, Y. Wang, J. Zhuang, H. Zhang, X. Li, X. Zhang, B. Büchner, S. M. Avdoshenko, A. A. Popov, N. Chen
Adv. Sci. 2019, 1901352. DOI: 10.1002/advs.201901352
High blocking temperature of magnetization and giant coercivity in the azafullerene Tb2@C79N with a single-electron Tb–Tb bond
G. Velkos, D. S. Krylov, K. Kirkpatrick, L. Spree, V. Dubrovin, B. Büchner, S. M. Avdoshenko, V. Bezmelnitsyn, S. Davis, P. Faust, J. Duchamp, H. C. Dorn, A. A. Popov
Angew. Chem. Int. Ed. 2019, 58, 5891. DOI: 10.1002/anie.201900943
Thermally-activated delayed fluorescence in Y3N@C80 endohedral fullerene: time resolved luminescence and electron paramagnetic resonance studies
M. Zalibera, D. S. Krylov, D. Karagiannis, P.-A. Will, F. Ziegs, S. Schiemenz, W. Lubitz, S. Reineke, A. Savitsky, A. A. Popov
Angew. Chem. Int. Ed. 2018, 130 (1), 283–287. DOI: 10.1002/anie.201710637
Record-high thermal barrier of the relaxation of magnetization in the nitride clusterfullerene Dy2ScN@C80-Ih
D. S. Krylov, F. Liu, S. M. Avdoshenko, L. Spree, B. Weise, A. Waske, A. U. B. Wolter, B. Büchner, A. A Popov
Chem. Commun. 2017, 53, 7901-7904. DOI: 10.1039/C7CC03580B
Single molecule magnet with an unpaired electron trapped between two lanthanide ions inside a fullerene
F. Liu, D. S. Krylov, L. Spree, S. M. Avdoshenko, N. A. Samoylova, M. Rosenkranz, A. Kostanyan, T. Greber, A. U. B. Wolter, B. Büchner, A. A. Popov
Nat. Commun. 2017, 8, 16098. DOI: 10.1038/ncomms16098
Synthesis and Structure of LaSc2N@Cs(hept)‐C80 with One Heptagon and Thirteen Pentagons
Y. Zhang, K. B. Ghiassi, Q. Deng, N. Samoylova, M. M. Olmstead, A. L. Balch, A. A. Popov
Angew. Chem. Int. Ed. 2015, 54 (2), 495-499. DOI: 10.1002/anie.201409094
Perfluoroalkylfullerenes
O. V. Boltalina, A. A. Popov, I. V. Kuvychko, N. B. Shustova, S. H. Straus
Chem. Rev. 2015, 115, 1051-1105. DOI: 10.1021/cr5002595
Methane as a selectivity booster in the synthesis of endohedral fullerenes: towards selective synthesis of the single molecule magnet Dy2TiC@C80 and its congener Dy2TiC2@C80
K. Junghans, C. Schlesier, A. Kostanyan, N. A. Samoylova, Q. Deng, M. Rosenkranz, S. Schiemenz, R. Westerström, T. Greber, B. Büchner, A. A. Popov
Angew. Chem. Int. Ed. 2015, 54 (45), 13411-13415. DOI: 10.1002/anie.201505870
Endohedral fullerene with μ3-carbido ligand and Titanium-Carbon double bond stabilized inside a carbon cage
A. L. Svitova, K. B. Ghiassi, C. Schlesier, K. Junghans, Y. Zhang, M. M. Olmstead, A. L. Balch, L. Dunsch, A. A. Popov
Nat. Commun. 2014, 5, 3568. DOI: 10.1038/ncomms4568
Clusters encapsulated in Endohedral Metallofullerenes: How strained are they?
Q. Deng, A. A. Popov
J. Am. Chem. Soc. 2014, 136 (11), 4257-4264. DOI: 10.1021/ja4122582
Endohedral Fullerenes
A. A. Popov, S. Yang, L. Dunsch
Chem. Rev. 2013, 113 (8), 5989–6113. DOI: 10.1021/cr300297r
Bonding between strongly repulsive metal atoms: an oxymoron made real in a confined space of endohedral metallofullerenes
A. A. Popov, S. M. Avdoshenko, A. M. Pendás, L. Dunsch
Chem. Commun. 2012, 48, 8031-8050. DOI: 10.1039/C2CC32568C
Internal @ IFW Dresden
External
Scaling a material down to nanometer-size reveals several opportunities to increase physical properties compared to bulk material or even create new ones. When quantum effects come into play electrical conductivity, magnetic permeability and chemical reactivity change as a function of particle size. Our approach uses carbon nanotubes (CNT) as a reaction container for the synthesis of intermetallic nanoparticles. With the given diameter of the tube particle size becomes adjustable. Furthermore the presence of the CNT-surrounding eases the reduction to metallic particle and protects nanoparticles from chemical influences (e.g. oxidation). Depending on the used material one obtains single particles or nano wires inside the inner cavity of the CNT. CNT have been filled for example with elements of main group IV in their metallic state. 3 different procedures to post synthetically fill the inner cavity of the CNT were used and by variation of the reaction parameters the appearance of filling particles, degree of filling and the purity of the samples in terms of coating to filling particle ratio can be tailored. These filled CNT with high rates of filling are promising for sensoric and energy storage applications.
The interest on 2D materials is rapidly growing and chemical approaches offer absolute control over the structure of 2D materials at the molecular-level. The chemical approach will serve as strategy to develop new multifunctional systems, featuring exceptional physical or chemical properties with optimal control over the correlation between structure and function. Our research currently focusses on the chemical vapor transport (CVT) in sealed ampules. One example is the CVT of bismuth chalcogenides nanostructures (Bi2Ch3; Ch = S, Se, Te) which can be synthesized by catalyst-free decomposition sublimation. The nanostructures directly grow on Si/SiO2 substrates by a vapor−solid growth mechanism and show high degree of crystallinity with dimensions of >10 μm in length and simultaneously <10 nm in height (nanoribbons). In order to optimize the growth process in a reproducible way we realize parallel thermodynamic calculations. The electrical transport data are evidence that this approach offers the chance to synthesize and investigate crystals with high quality and to measure surface state properties.
HeatCNT
In this EFRE (European Regional Development Fund) project, the IFW Dresden and the Fraunhofer-Institut für Fertigungstechnik u. Angewandte Materialforschung, develop a composite material made of carbon nanotubes (CNTs) in a copper matrix for application as a heat-exchange medium. By playing with different fabrication parameters such as the alignment of the CNTs, their volume fraction, and selective etching that leaves CNTs partially exposed, it is possible to tailor the thermal properties of the material for specific radiative, convective and conducting applications.
Schlott A, Hutsch T, Hampel S, Lohse J, Weißgärber T, Kieback B. Heat Exchange Structures Based on Copper/CNT Composite. Key Engineering Materials 2019;809:106–14. https://doi.org/10.4028/www.scientific.net/kem.809.106
Small molecule single crystals as highly ordered systems allow for investigation of fundamental electronic properties of organic semiconductors. We grow high-purity organic single crystals and investigate charge transport, electronic correlations and charge transfer effects. The crystals are fully characterized by means of X-ray diffraction, atomic force microscopy (AFM), scanning Kelvin probe microscopy, and optical spectroscopy. Electronic transport properties are investigated by means of temperature-dependent multi-terminal conductivity, field effect transistor (FET), and Hall Effect measurements. To reach very high charge carrier concentrations we build charge transfer interfaces and use different ionic gate dielectrics.
Kamil Ivshin
Christoph Hadlich
T. Tang, P. Dacha, K. Haase, J. Kreß, C. Hänisch, J. Perez, Y. Krupskaya, A. Tahn, D. Pohl, S. Schneider, F. Talnack, M. Hambsch, S. Reineke, Y. Vaynzof, S.C.B. Mannsfeld
Analysis of the Annealing Budget of Metal Oxide Thin‐Film Transistors Prepared by an Aqueous Blade‐Coating Process
Advanced Functional Materials
33,
2207966/1-16
(2023) URL
N.K. Garg, Y. Goriya, S. Manojveer, S. Muratović, D. Pajić, M. Cetina, I. Petreska, Y. Krupskaya, V. Kataev, M.T. Johnson, O.F. Wendt, D. Žilić
A mononuclear iron(iii) complex with unusual changes of color and magneto-structural properties with temperature: synthesis, structure, magnetization, multi-frequency ESR and DFT study
Dalton Transactions
51,
2338-2345
(2022) URL
S. Muratović, V. Martinez, B. Karadeniz, D. Pajić, I. Brekalo, M. Arhangelskis, M. Mazaj, G. Mali, M. Etter, T. Friščić, Y. Krupskaya, V. Kataev, D. Žilić, K. Užarević
Low-Dimensional Magnetism in Multivariate Copper/Zinc MOF-74 Materials Formed via Different Mechanochemical Methods
Inorganic Chemistry
61,
18181-18192
(2022) URL
L. Graf, F. Liu, M. Naumann, F. Roth, B. Debnath, B. Büchner, Y. Krupskaya, A. Popov, M. Knupfer
Optical Anisotropy and Momentum-Dependent Excitons in Dibenzopentacene Single Crystals
ACS Omega
7,
21183–2119
(2022) URL
F. Talnack, S. Hutsch, M. Bretschneider, Y. Krupskaya, B. Büchner, M. Malfois, M. Hambsch, F. Ortmann, S. Mannsfeld
Thermal behavior and polymorphism of 2,9-didecyldinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene thin films
Molecular Systems Design & Engineering
7,
507-519
(2022) URL
O. Kataeva, K. Ivshin, K. Metlushka, K. Nikitina, V. Khrizanforova, Y. Budnikova, R. Fayzullin, S. Latypov, S. Schiemenz, M. Bretschneider, A. Popov, S. Avdoshenko, Y. Krupskaya, B. Büchner, M. Knupfer
New Charge Transfer Cocrystals of F2TCNQ with Polycyclic Aromatic Hydrocarbons: Acceptor–Acceptor Interactions and Their Contribution to Supramolecular Arrangement and Charge Transfer
Crystal Growth & Design
22,
751–762
(2022) URL
L. Graf, F. Liu, M. Naumann, F. Roth, B. Debnath, B. Büchner, Y. Krupskaya, A. Popov, M. Knupfer
Correction to: Optical Anisotropy and Momentum-Dependent Excitons in Dibenzopentacene Single Crystals
ACS Omega
7,
36902
(2022) URL
F. Borrmann, T. Tsuda, O. Guskova, N. Kiriy, C. Hoffmann, D. Neusser, S. Ludwigs, U. Lappan, F. Simon, M. Geisler, B. Debnath, Y. Krupskaya, M. Al‐Hussein, A. Kiriy
Charge‐Compensated N‐Doped π ‐Conjugated Polymers: Toward both Thermodynamic Stability of N‐Doped States in Water and High Electron Conductivity
Advanced Science
9,
2203530/1-17
(2022) URL
S. Wang, M. Panhans, I. Lashkov, H. Kleemann, F. Caglieris, D. Becker-Koch, J. Vahland, E. Guo, S. Huang, Y. Krupskaya, Y. Vaynzof, B. Büchner, F. Ortmann, K. Leo
Highly efficient modulation doping: A path toward superior organic thermoelectric devices
Science Advances
8,
eabl9264/1-8
(2022) URL
C. Albert, T. Ballé, F. Breitner, Y. Krupskaya, A. Alfonsov, Z. Zangeneh, S. Avdoshenko, M. Eldeeb, L. Hozoi, A. Vilangottunjalil, E. Haubold, A. Charnukha, B. Büchner, A. Jesche, V. Kataev
Terahertz Magneto-Optical Excitations of the sd-Hybrid States of Lithium Nitridocobaltate Li2(Li1–xCox)N
Inorganic Chemistry
60,
4497-4507
(2021) URL
L. Graf, Y. Krupskaya, B. Büchner, M. Knupfer
Exciton dispersion in para-quaterphenyl: Significant molecular interactions beyond Coulomb coupling
AIP Advances
11,
095313/1-6
(2021) URL
K. Ditte, N. Kiriy, J. Perez, M. Hambsch, S. Mannsfeld, Y. Krupskaya, R. Maragani, B. Voit, F. Lissel
Charge Carrier Mobility Improvement in Diketopyrrolopyrrole Block-Copolymers by Shear Coating
Polymers
13,
1435/1-14
(2021) URL
S. Wang, M. Sawatzki, H. Kleemann, I. Lashkov, D. Wolf, A. Lubk, F. Talnack, S. Mannsfeld, Y. Krupskaya, B. Büchner, K. Leo
Vacuum processed large area doped thin-film crystals: A new approach for high-performance organic electronics
Materials Today Physics
17,
100352/1-8
(2021) URL
Y. Karpov, N. Kiriy, P. Formanek, C. Hoffmann, T. Beryozkina, M. Hambsch, M. Al-Hussein, S. Mannsfeld, B. Büchner, B. Debnath, M. Bretschneider, Y. Krupskaya, F. Lissel, A. Kiriy
Sequentially Processed P3HT/CN6-CP•−NBu4+ Films: Interfacial or Bulk Doping?
Advanced Electronic Materials
2020,
1901346/1-13
(2020) URL
S. Muratović, B. Karadeniz, T. Stolar, S. Lukin, I. Halasz, M. Herak, G. Mali, Y. Krupskaya, V. Kataev, D. Žilić, K. Užarević
Impact of dehydration and mechanical amorphization on the magnetic properties of Ni(II)-MOF-74
Journal of Materials Chemistry C
8,
7132-7142
(2020) URL
O. Kataeva, K. Ivshin, K. Metlushka, S. Latypov, K. Nikitina, D. Zakharychev, A. Laskin, V. Alfonsov, O. Sinyashin, E. Mgeladze, A. Jäger, Y. Krupskaya, B. Büchner, M. Knupfer
Charge-Transfer Complexes of Linear Acenes with a New Acceptor Perfluoroanthraquinone. The Interplay of Charge-Transfer and F···F Interactions
Crystal Growth & Design
19,
5123-5131
(2019) URL
R. Shekurov, V. Khrizanforova, L. Gilmanova, M. Khrizanforov, V. Miluykov, O. Kataeva, Z. Yamaleeva, T. Burganov, T. Gerasimova, A. Khamatgalimov, S. Katsyuba, V. Kovalenko, Y. Krupskaya, V. Kataev, B. Büchner, V. Bon, I. Senkovska, S. Kaskel, A. Gubaidullin, O. Sinyashin, Y. Budnikova
Zn and Co redox active coordination polymers asefficient electrocatalysts
Dalton Transactions
48,
3601-3609
(2019) URL
S. Ehrling, I. Senkovska, V. Bon, J.D. Evans, P. Petkov, Y. Krupskaya, V. Kataev, T. Wulf, A. Krylov, A. Vtyurin, S. Krylova, S. Adichtchev, E. Slyusareva, M.S. Weiss, B. Büchner, T. Heine, S. Kaskel
Crystal size versus paddle wheel deformability: selective gated adsorption transitions of the switchable metal–organic frameworks DUT-8(Co) and DUT-8(Ni)
Journal of Materials Chemistry A
7,
21459-21475
(2019) URL
H. Zhong, K. Ly, M. Wang, Y. Krupskaya, X. Han, Jichao Zhang, Jian Zhang, V. Kataev, B. Büchner, I. Weidinger, S. Kaskel, P. Liu, M. Chen, R. Dong, X. Feng
A Phthalocyanine-Based Layered Two-Dimensional Conjugated Metal-Organic Framework as a Highly Efficient Electrocatalyst for the Oxygen Reduction Reaction
Angewandte Chemie-International Edition
58,
10677 – 10682
(2019) URL
O. Kataeva, K. Metlushka, K. Ivshin, K. Nikitina, V. Alfonsov, A. Vandyukov, M. Khrizanforov, Y. Budnikova, O. Sinyashin, Y. Krupskaya, V. Kataev, B. Büchner, M. Knupfer
An unusual donor–acceptor system MnIIPc-TCNQ/F4-TCNQ and the properties of the mixed single crystals of metal phthalocyanines with organic acceptor molecules
Dalton Transactions
48,
17252-17257
(2019) URL
O. Kataeva, K. Metlushka, K. Ivshin, A. Kiiamov, V. Alfonsov, M. Khrizanforov, Y. Budnikova, O. Sinyashin, Y. Krupskaya, V. Kataev, B. Büchner, M. Knupfer
Electron Transfer and Unusual Chemical Transformations of F4-TCNQ in a Reaction with Mn-Phthalocyanine
European Journal of Inorganic Chemistry
2018,
3344-3353
(2018) URL
L.A. Dubraja, M. Juric, J. Popovic, D. Pajic, Y. Krupskaya, V. Kataev, B. Büchner, D. Zilic
Magneto-structural correlations in oxalate-bridged Sr(II)Cr(III) coordination polymers: structure, magnetization, X-band, and high-field ESR studies
Dalton Transactions
47,
3992-4000
(2018) URL
Y. Krupskaya, M. Schäpers, A. Wolter-Giraud, H. Grafe, E. Vavilova, A. Moeller, B. Büchner, V. Kataev
Magnetic Resonance Study of the Spin-1/2 Quantum Magnet BaAg2Cu[VO4]2
Zeitschrift für Physikalische Chemie
231,
759-775
(2017) URL
M. Rams, M. Boehme, V. Kataev, Y. Krupskaya, B. Büchner, W. Plass, T. Neumann, Z. Tomkowicz, C. Naether
Static and dynamic magnetic properties of the ferromagnetic coordination polymer [Co(NCS)2(py)2]n
Physical Chemistry Chemical Physics
19,
24534-24544
(2017) URL
D. Zilic, K. Molcanov, M. Juric, J. Habjanic, B. Rakvin, Y. Krupskaya, V. Kataev, S. Wurmehl, B. Büchner
3D oxalate-based coordination polymers: Relationship between structure, magnetism and color, studied by high-field ESR spectroscopy
Polyhedron
126,
120-126
(2017) URL
R. Shekurov, V. Miluykov, O. Kataeva, D. Krivolapov, O. Sinyashin, T. Gerasimova, S. Katsyuba, V. Kovalenko, Y. Krupskaya, V. Kataev, B. Büchner, I. Senkovska, S. Kaskel
Reversible Water-Induced Structural and Magnetic Transformations and Selective Water Adsorption Properties of Poly(manganese 1,1'ferrocenediyl-bis(H-phosphinate))
Crystal Growth & Design
12,
5084-5090
(2016) URL
Y. Krupskaya, F. Rueckerl, M. Knupfer, A.F. Morpurgo
Charge Transfer, Band-Like Transport, and Magnetic Ions at F16CoPc/Rubrene Interfaces
Advanced Materials Interfaces
3,
1500863/1-5
(2016) URL
M.A. Abdulmalic, A. Aliabadi, A. Petr, Y. Krupskaya, V. Kataev, B. Büchner, R. Zaripov, E. Vavilova, V. Voronkova, K. Salikov, T. Hahn, J. Kortus, F. Eya'ane Meva, D. Schaarschmidt, T. Rueffer
Magnetic superexchange interactions: trinuclear bis(oxamidato) versus bis(oxamato) type complexes
Dalton Transactions
44,
8062-8079
(2015) URL
D. Zilic, L. Andros, Y. Krupskaya, V. Kataev, B. Büchner
Magnetic anisotropy of Cr(III) ions in polymeric oxalate complexes as revealed by HF-ESR spectroscopy
Applied Magnetic Resonance
46,
309-321
(2015) URL
I.A. Garifullin, P.V. Leksin, N.N. Garifyanov, A.A. Kamashev, Y.V. Fominov, J. Schumann, Y. Krupskaya, V. Kataev, O.G. Schmidt, B. Büchner
The superconducting spin valve and triplet superconductivity
Journal of Magnetism and Magnetic Materials
373,
18-22
(2015) URL
V.A. Miluykov, I.A. Bezkishko, L.R. Kochetkova, O.N. Kataeva, T.P. Gerasimova, S.A. Katsyuba, O.G. Sinyashin, P. Loennecke, E. Hey-Hawkins, A. Parameswaran, Y. Krupskaya, Kataevc V., B. Büchner
Synthesis and magnetic properties of manganese carbonyl complexes with different coordination modes of 3,4,5-triaryl-1,2-diphospholide ligands
Dalton Transactions
44,
10259-10266
(2015) URL
R.G. Mendes, B. Koch, A. Bachmatiuk, A.A. El-Gendy, Y. Krupskaya, A. Springer, R. Klingeler, O.G. Schmidt, B. Büchner, S. Sanchez, M.H. Ruemmeli
Synthesis and toxicity characterization of carbon coated iron oxide nanoparticles with highly defined size distributions
Biochimica et Biophysica Acta
1840,
160-169
(2014) URL
S. Johnston, M. Abdel-Hafiez, L. Harnagea, V. Grinenko, D. Bombor, Y. Krupskaya, C. Hess, S. Wurmehl, A.U.B. Wolter, B. Büchner, H. Rosner, S.-L. Drechsler
Specific heat of Ca0.32Na0.68Fe2As2 single crystals: Unconventional s +- multiband superconductivity with intermediate repulsive interband coupling and sizable attractive intraband couplings
Physical Review B
89,
134507/1-11
(2014) URL
A.L. Svitova, Y. Krupskaya, N. Samoylova, R. Kraus, J. Geck, L. Dunsch, A.A. Popov
Magnetic moments and exchange coupling in nitride clusterfullerenes GdxSc3-xN-at-C80 (x = 1-3)
Dalton Transactions
43,
7387-7390
(2014) URL
M. Golecki, J. Lach, A. Jeremies, F. Lungwitz, M. Fronk, G. Salvan, D.R.T. Zahn, J. Park, Y. Krupskaya, V. Kataev, R. Klingeler, B. Büchner, B. Mahns, M. Knupfer, P.F. Siles, D. Grimm, O.G. Schmidt, A. Reis, W.R. Thiel, D. Breite, B. Abel, B. Kersting
Chemisorption of exchange-coupled (Ni2L(dppba)) complexes on gold by using ambidentate 4- (Diphenylphosphino)benzoate Co-Ligands
Chemistry - A European Journal
19,
7787-7801
(2013) URL
P.V. Leksin, N.N. Garifyanov, I.A. Garifullin, Y.V. Fominov, J. Schumann, Y. Krupskaya, V. Kataev, O.G. Schmidt, B. Büchner
Evidence for triplet superconductivity in a superconductor-ferromagnet spin valve
Physical Review Letters
109,
057005/1-5
(2012) URL
M.A. Abdulmalic, A. Aliabadi, A. Petr, Y. Krupskaya, V. Kataev, B. Büchner, T. Hahn, J. Kortus, T. Rueffer
An interplay between the spin density distribution and magnetic superexchange interactions: A case study of mononuclear [nBu4N]2[Cu(opooMe)] and novel asymmetric trinuclear [Cu3(opooMe)(pmdta)2](NO3)2·3MeCN
Dalton Transactions
41,
14657-14670
(2012) URL
A.N. Vasiliev, O.S. Volkova, E. Hammer, R. Glaum, J.-M. Broto, M. Millot, G. Nenert, Y.T. Liu, J.-Y. Lin, R. Klingeler, M. Abdel-Hafiez, Y. Krupskaya, A.U.B. Wolter, B. Büchner
Weak ferrimagnetism and multiple magnetization reversal in α-Cr3(PO4)2
Physical Review B
85,
014415/1-7
(2012) URL
D. Yakhvarov, E. Trofimova, O. Sinyashin, O. Kataeva, Y. Budnikova, P. Loennecke, E. Hey-Hawkins, A. Petr, Y. Krupskaya, V. Kataev, R. Klingeler, B. Büchner
New dinuclear nickel(II) complexes: Synthesis, structure, electrochemical, and magnetic properties
Inorganic Chemistry
50,
4553-4558
(2011) URL
P. Lukanov, V.K. Anuganti, Y. Krupskaya, A.-M. Galibert, B. Soula, C. Tilmaciu, A.H. Velders, R. Klingeler, B. Büchner, E. Flahaut
CCVD synthesis of carbon-encapsulated cobalt nanoparticles for biomedical applications
Advanced Functional Materials
21,
3583-3588
(2011) URL
Y. Krupskaya, R. Zaripov, E. Vavilova, V. Miluykov, I. Bezkishko, D. Krivolapov, O. Kataeva, O. Sinyashin, E. Hey-Hawkins, V. Voronkova, K. Salikhov, V. Kataev, B. Büchner
Electron spin coherence in antiferromagnetically coupled binuclear Mn complexes
Physical Review B
84,
092402/1-4
(2011) URL
A. Das, K. Gieb, Y. Krupskaya, S. Demeshko, S. Dechert, R. Klingeler, V. Kataev, B. Büchner, P. Mueller, F. Meyer
A new family of 1D exchange biased heterometal single-molecule magnets: Observation of pronounced quantum tunneling steps in the hysteresis loops of quasi-linear {Mn2Ni3} clusters
Journal of the American Chemical Society
133,
3433-3443
(2011) URL
A. Taylor, Y. Krupskaya, K. Kraemer, S. Fuessel, R. Klingeler, B. Büchner, M.P. Wirth
Cisplatin-loaded carbon-encapsulated iron nanoparticles and their in vitro effects in magnetic fluid hyperthermia
Carbon
48,
2327-2334
(2010) URL
K. Lipert, M. Ritschel, A. Leonhardt, Y. Krupskaya, B. Büchner, R. Klingeler
Magnetic properties of carbon nanotubes with and without catalyst
Journal of Physics: Conference Series
200,
072061/1-4
(2010) URL
Y. Krupskaya, A. Alfonsov, A. Parameswaran, V. Kataev, R. Klingeler, G. Steinfeld, N. Beyer, M. Gressenbuch, B. Kersting, B. Büchner
Interplay of magnetic exchange interactions and NiSNi bond angles in polynuclear Nickel(II) complexes
ChemPhysChem
11,
1961-1970
(2010) URL
Y. Krupskaya, A. Parameswaran, A. Alfonsov, R. Klingeler, V. Kataev, N. Beyer, J. Lach, M. Gressenbuch, B. Kersting, B. Büchner
High-field ESR and magnetization study of a novel macrocyclic chelate trinuclear Ni(II) complex
Journal of Low Temperature Physics
159,
84-87
(2010) URL
V. Miluykov, I. Bezkishko, D. Krivolapov, O. Kataeva, O. Sinyashin, E. Hey-Hawkins, A. Parameswaran, Y. Krupskaya, V. Kataev, R. Klingeler, B. Büchner
Binuclear 1,2-diphosphacyclopentadienyl manganese(I) complexes: Synthesis, structure and magnetic properties
Organometallics
29,
1339-1342
(2010) URL
A. Taylor, Y. Krupskaya, S. Costa, S. Oswald, K. Kraemer, S. Fuessel, R. Klingeler, B. Büchner, E. Borowiak-Palen, M.P. Wirth
Functionalization of carbon encapsulated iron nanoparticles
Journal of Nanoparticle Research
12,
513-519
(2010) URL
A.A. El-Gendy, E.M.M. Ibrahim, V.O. Khavrus, Y. Krupskaya, S. Hampel, A. Leonhardt, B. Büchner, R. Klingeler
The synthesis of carbon coated Fe, Co and Ni nanoparticles and an examination of their magnetic properties
Carbon
47,
2821-2828
(2009) URL
Y. Krupskaya, C. Mahn, A. Parameswaran, A. Taylor, K. Kraemer, S. Hampel, A. Leonhardt, M. Ritschel, B. Büchner, R. Klingeler
Magnetic study of iron-containing carbon nanotubes: Feasibility for magnetic hyperthermia
Journal of Magnetism and Magnetic Materials
321,
4067-4071
(2009) URL
We kindly invite you to participate in the
6th Summer School Spectroelectrochemistry 2023.
Spectroelectrochemistry as the combination of electrochemistry and various spectroscopic methods delivers detailed information on the electron transfer reactions in organic semiconductors:
(i) detection of electrochemically generated species;
(ii) their characterization (structure, properties, stability);
(iii) concentration profile of charge carriers in dependence of applied potential;
(iv) elucidation of the electrochemical reaction mechanism.
We are studing π-conjugated organic structures (small organic molecules, oligomers, conducting polymers etc.), carbon nanostructures (nanotubes, empty and endohedral fullerenes, and their functional derivatives etc.), hybrid molecular structures (metal-organic compounds, coordination complexes, endohedral metallofullerenes etc.), reactive oxygen species (ROS) in solution.
We have an expertise in various electrochemical and spectroscopic techniques and their combinations for in situ measurements:
M. Rosenkranz, S. Leßny, B. Noecker, S. Breakspear, E. Dmitrieva
Formation of free radicals in human hair under strain: Combined electron paramagnetic resonance (EPR) – Strain technique
Talanta | 2022 | Volume: 249 | P. 123707 | URL
E. Dmitrieva, M. Rosenkranz, J.S. Danilova, E.A. Smirnova, M.P. Karushev, I.A. Chepurnaya, A.M. Timonov
Radical formation in polymeric nickel complexes with N2O2 Schiff base ligands: An in situ ESR and UV-vis-NIR spectroelectrochemical study
Electrochimica Acta | 2019 | Volume: 283 | P. 1742-1752 | URL
E. Dmitrieva, M. Rosenkranz, Y. Alesanco, A. Viñuales
Spectroelectrochemical study of alkyl-aryl asymmetric viologens in poly(vinyl alcohol) (PVA) – borax electrolyte
Electrochimica Acta | 2018 | Volume: 323 | P. 134792 | URL
Z. Morávková, E. Dmitrieva
The First Products of Aniline Oxidation - SERS Spectroelectrochemistry
ChemistrySelect | 2017 | Volume: 4 | Issue: 30 | P. 8847 –8854 | URL
The Spectroelectrochemistry group in IFW has state-of-the-art equipment and expertise for in situ studies of the electrochemical electron transfer in soluiton using IR, Raman, ESR, NMR, UV-vis-NIR and luminescence techniques.
Bruker EMXplus X-band CW spectrometer with a variable temperature unit and an integrated device for the EPR-strain measurements
Avantes diode array spectrometer (200 - 2000 nm)
Bruker FTIR spectrometer Vertex 80v (50-8000 cm-1, vacuum)
confocal FTIR microscope Hyperion 2000
Bruker Avance II 500 MHz with a standard 5 mm probe head
Thermo Fisher Scientific DXR Smart Raman spectrometer (532, 633 and 780 nm laser excitation)
Advanced Research Raman System T64000 (Horiba Scientific) with confocal Raman microscope
potentiostats (HEKA, Metrohm Autolab, PAR)
Layered van der Waals materials of the family TaTMTe4 (TM = Ir, Rh, Ru) areshowing interesting electronic properties. We report the growth and characterization of TaIrTe4, TaRhTe4, TaIr1−xRhxTe4 (x = 0.06, 0.14, 0.78, 0.92), Ta1+xRu1−xTe4 single crystals. X-ray powder diffraction confirms that TaRhTe4 is isostructural to TaIrTe4. All these compounds are metallic with diamagnetic behavior. Below T ≈ 4 K we observed signatures of the superconductivity in the TaIr1−xRhxTe4 compounds for x = 0.92. All samples show weak quadratic-in-field magnetoresistance (MR). However, for TaIr1−xRhxTe4 with x ≈ 0.78, the MR has a linear term dominating in low fields that indicates the presence of Dirac cones in the vicinity of the Fermi energy. For TaRhTe4 series the MR is almost isotropic. Electronic structure calculations for TaIrTe4 and TaRhTe4 reveal appearance of the Rh band close to the Fermi level.
J. Phys. Chem. Lett. 12, 6730−6735, (2021)
We report the crystal growth by chemical vapor transport together with a thorough structural and magnetic characterization of the quasi-2D magnets (Fe1−xNix)2P2S6 with xNi = 0, 0.3, 0.5, 0.7, 0.9, and 1. As-grown crystals exhibit a layered morphology with weak van der Waals interactions between layers parallel to the crystallographic ab plane of the monoclinic structure in the space group C2/m (No. 12). Magnetization measurements reveal an antiferromagnetic ground state for all grown crystals. In the ordered state, the magnetization along different crystallographic directions is in agreement with an Ising anisotropy for 0 x 0.9 and only for Ni2P2S6 a different behavior is observed which is in line with an anisotropic Heisenberg or XXZ model description. This striking abrupt change of anisotropy at a critical Ni concentration is coupled to a change in the width of the maximum in the magnetization around Tmax. Furthermore, all intermediate compounds 0 < x 0.9 exhibit an anisotropic magnetization already in the paramagnetic state similar to the parent compound Fe2P2S6.
Phys. Rev. Materials, 5, 073401(2021)
We report an optimized chemical vapor transport method to grow single crystals of (Mn1-xNix)2P2S6 where x = 0, 0.3, 0.5, 0.7, and 1. Single crystals up to 4 mm 3 mm 200 m were obtained by this method. As-grown crystals are characterized by means of scanning electron microscopy and powder X-ray diffraction measurements. The structural characterization shows that all crystals crystallize in monoclinic symmetry with the space group C2/m (No. 12). We have further investigated the magnetic properties of this series of single crystals. The magnetic measurements of the all as-grown single crystals show long-range antiferromagnetic order along all principal crystallographic axes. Overall, the Néel temperature TN is non-monotonous; with increasing Ni2+ doping, the temperature of the antiferromagnetic phase transition first decreases from 80 K for pristine Mn2P2S6 (x = 0) up to x = 0.5 and then increases again to 155 K for pure Ni2P2S6 (x = 1). The magnetic anisotropy switches from out-of-plane to in-plane as a function of composition in (Mn1-xNix)2P2S6 series. Transport studies under hydrostatic pressure on the parent compound Mn2P2S6 evidence an insulator-metal transition at an applied critical pressure of ~22 GPa.
Electron. Mater. 2021, 2, 284–298.
We report resistive switching in voltage biased point contacts (PCs) based on the van der Waals transition metal tellurides (TMTs) MeTe2 (Me = Mo, W) and TaMeTe4 (Me = Ru, Rh, Ir). The switching occurs between a low resistive “metallic-type” state, which is the ground state, and a high resistive “semiconducting-type” state by applying a certain bias voltage (<1V). The reverse switching takes place by applying voltage of opposite polarity. The origin of the effect can be attributed to the formation of domains with different crystal structure in the PC core due to a strong electric field (>10 kV/cm). The new functionality of the studied TMT materials, which emerges from switchable domains in submicron heterostructures, is very promising, e.g., for nonvolatile resistive random access memory engineering.
Phys. Rev. Materials, 5, 084004,(2021)
PtBi2 is a polymorphic system with interesting electronic properties. Here we report optimized crystal growth and structural characterization of pyrite-type and trigonal modification of PtBi2. Selected area electron diffraction, x-ray powder diffraction, and further Rietveld refinement confirms that trigonal PtBi2 crystallizes in the noncentrosymmetric P31m space group, and pyrite-type PtBi2 crystallizes in the Pa¯3 space group. A series of Pt1−xRhxBi2 samples was obtained for x = 0, 0.03, 0.35 in the trigonal PtBi2 structure. These Pt1−xRhxBi2 compounds become superconducting where the critical temperature increases from Tc = 600 mK for x = 0 up to Tc = 2.7 K for x = 0.35. Furthermore, we calculate the electronic band structure using the obtained structure parameters. The calculated density of states shows a minimum for the stoichiometric compound at the Fermi level. These findings warrant further research using a broader array of experimental techniques, as well as on the effect of the substitution on the nontrivial band structure.
Phys. Rev. Materials, 4, 124202 (2020)
For the next generation of functional devices, two dimensional (2D) materials are of great interest. Magnetic (2D) van der Waals (vdW) materials such as CuCrP2S6 got an unprecedented boost in scientific research because of the fascinating physical properties. CuCrP2S6 can be considered a potential magneto electric material, in which the out-of-plane ferroelectricity was recently observed in few-layers of CuCrP2S6. Becoming one of few examples of 2D multiferroic materials. While this is obviously promising for nano scaled devices which could revolutionize information technologies, also from the fundamental physics point of view it is interesting to understand the properties and coupling of the electrical and magnetic types of order. This study focuses on the optimized crystal growth via chemical vapor transport, their detailed structural and compositional characterization as well as a thorough investigation of the magnetic properties. CuCrP2S6 crystallizes in the monoclinic space group C2/c. Magnetization measurements on bulk single crystals reveal an antiferromagnetic ground state with TN ~ 30K and a positive Curie-Weiss temperature in agreement with dominant ferromagnetic intralayer coupling. Successful exfoliation of CuCrP2S6 flakes down to a thickness of 2.6 nm.
Ref. Selter et al., Phys. Rev. Materials, 7, 033402, (2023).
For the next generation of functional devices in spintronics and quantum devices, two dimensional (2D) materials are of great interest. Layered semimetallic van der Waals material TiSe2 has attracted a lot of attention because of the interplay between a chiral charge density wave (CDW) state and superconductivity. At the same time the sister compound TiS2, which is isovalent to TiSe2 and has the same crystal structure, shows a semiconducting behavior. The mixed crystalline system TiSeS is of great scientific interest as it is located in the middle with interesting properties. The authors report, the growth and electronic structure characterization of TiSeS single crystals. TiSeS crystals exhibit a layered morphology with weak van der Waals interactions between layers parallel to the crystallographic ab plane of the trigonal structure in the space group P3 ̅m1(No. 164). The low dimensionality character of the compound results in negative magneto resistance stemming from weak-localization effects. Angle-resolved photo emission (ARPES) experiments reveal that the electron and hole pockets are much smaller in TiSeS.
Ref. Shemerliuk et al., Phys. Rev. Materials, 7, 033405, (2023).
Our main focus of research is the synthesis of quantum materials. Materials that exhibit the phenomena arising from quantum mechanical properties of the electrons such as Mott transition, high temperature superconductivity, topological insulators (Weyl & Dirac semimetals) and quantum spin liquids etc., We aim to synthesize these quantum materials and establish the structure property relationship.
Sulfur based quantum materials: Plethora of novel phenomena occur at the phase boundary of insulator to metal, popularly known as Mott-transition caused by the repulsive Coulomb interactions between the electrons. We explore novel sulfides, in particular in the field of sulfur based quantum materials such as BaFe2S3, TMP2S6, TMS2 (TM=transtition metal). In our recent investigation on BaFe2S3 we have established such a bandwidth controlled insulator-metal transition. In another investigation we have shown effects of the magnetic correlations and effective tuning of magnetic anisotropy in (FeNi)2P2S6 & (MnNi)P2S6
Topological based quantum Materials: Dirac semimetals with multiple degenerate points of the electron band structure, which were predicted recently. We explore novel synthesis techniques to synthesize and investigate the electronic structure. In our recent investigation on cubic PtBi2 we have successfully shown such triple fermions very near to the Fermi level. Where as trigonal PtBi2 is superconducting at 600 mK.
Dr. Aswatham
Email: s.aswartham(@)ifw-dresden.de
Phone: + (49) 351 4659 668
In cooperation with University of Amsterdam, this group is devoted to the exploratory synthesis and comprehensive characterization of topologically non-trivial materials.
G. Naselli, V. Könye, S.K. Das, G.G.N. Angilella, A. Isaeva, J. van den Brink, I.C. Fulga
Nontrivial gapless electronic states at the stacking faults of weak topological insulators
Physical Review B
106,
094105/1-8
(2022) URL
T. Klaproth, M. Knupfer, A. Isaeva, M. Roslova, B. Büchner, A. Koitzsch
Charge transfer at the α−RuCl3/MnPc interface
Physical Review B
106,
165418/1-7
(2022) URL
T. Klaproth, E. Müller, C. Habenicht, B. Büchner, M. Knupfer, M. Roslova, A. Isaeva, T. Doert, A. Koitzsch
Tuning the electronic structure of the trichloride honeycomb lattice by transition metal substitution
Physical Review Materials
6,
014001/1-7
(2022) URL
G. Bastien, E. Vinokurova, M. Lange, K.K. Bestha, L.T. Corredor, G. Kreutzer, A. Lubk, T. Doert, B. Büchner, A. Isaeva, A.U.B. Wolter-Giraud
Dilution of the magnetic lattice in the Kitaev candidate α−RuCl3 by Rh3+ doping
Physical Review Materials
6,
114403/1-15
(2022) URL
L. Folkers, L.T. Corredor, F. Lukas, M. Sahoo, A. Wolter, A. Isaeva
Occupancy disorder in the magnetic topological insulator candidate Mn1−x Sb2+x Te4
Zeitschrift für Kristallographie
237,
101-108
(2022) URL
B. Wolf, D.A.S. Kaib, A. Razpopov, S. Biswas, K. Riedl, S.M. Winter, R. Valentí, Y. Saito, S. Hartmann, E. Vinokurova, T. Doert, A. Isaeva, G. Bastien, A.U.B. Wolter, B. Büchner, M. Lang
Combined experimental and theoretical study of hydrostatic He-gas pressure effects in α−RuCl3
Physical Review B
106,
134432/1-13
(2022) URL
T. Klaproth, M. Grönke, S. Hampel, M. Knupfer, B. Büchner, A. Isaeva, T. Doert, A. Koitzsch
Work Function Engineering of Thin α‐RuCl3 by Argon Sputtering
Advanced Materials Interfaces
9,
2200754/1-6
(2022) URL
A. Alfonsov, J.I. Facio, K. Mehlawat, A.G. Moghaddam, R. Ray, A. Zeugner, M. Richter, J. van den Brink, A. Isaeva, B. Büchner, V. Kataev
Strongly anisotropic spin dynamics in magnetic topological insulators
Physical Review B
103,
L180403/1-7
(2021) URL
R. Vidal, H. Bentmann, J. Facio, T. Heider, P. Kagerer, C. Fornari, T. Peixoto, T. Figgemeier, S. Jung, C. Cacho, B. Büchner, J. van den Brink, C. Schneider, L. Plucinski, E. Schwier, K. Shimada, M. Richter, A. Isaeva, F. Reinert
Orbital Complexity in Intrinsic Magnetic Topological Insulators MnBi4Te7 and MnBi6Te10
Physical Review Letters
126,
176403
(2021) URL
A. Alfonsov, K. Mehlawat, A. Zeugner, A. Isaeva, B. Büchner, V. Kataev
Magnetic-field tuning of the spin dynamics in the magnetic topological insulators (MnBi2Te4)(Bi2Te3)n
Physical Review B
104,
195139/1-12
(2021) URL
P. Gebauer, H. Poddig, L.T. Corredor, T.V. Menshchikova, I.P. Rusinov, P. Golub, F. Caglieris, C. Benndorf, T. Lindemann, E.V. Chulkov, A.U.B. Wolter, B. Büchner, T. Doert, A. Isaeva
Heavy-Atom Antiferromagnet GdBiTe: An Interplay of Magnetism and Topology in a Symmetry-Protected Topological Semimetal
Chemistry of Materials
33,
2420-2435
(2021) URL
J. Zeisner, K. Mehlawat, A. Alfonsov, M. Roslova, T. Doert, A. Isaeva, B. Büchner, V. Kataev
Electron spin resonance and ferromagnetic resonance spectroscopy in the high-field phase of the van der Waals magnet CrCl3
Physical Review Materials
4,
064406/1-8
(2020) URL
A. Tan, V. Labracherie, N. Kunchur, A. Wolter-Giraud, J. Cornejo, B. Büchner, J. Dufouleur, A. Isaeva, R. Giraud
Metamagnetism of Weakly Coupled Antiferromagnetic Topological Insulators
Physical Review Letters
124,
197201/1-6
(2020) URL
R. Hentrich, X. Hong, M. Gillig, F. Caglieris, M. Čulo, M. Shahrokhvand, U. Zeitler, M. Roslova, A. Isaeva, T. Doert, L. Janssen, M. Vojta, B. Büchner, C. Hess
High-field thermal transport properties of the Kitaev quantum magnet α−RuCl3: Evidence for low-energy excitations beyond the critical field
Physical Review B
102,
235155/1-8
(2020) URL
N. Avraham, A. Kumar Nayak, A. Steinbok, A. Norris, H. Fu, Y. Sun, Y. Qi, L. Pan, A. Isaeva, A. Zeugner, C. Felser, B. Yan, H. Beidenkopf
Visualizing coexisting surface states in the weak and crystalline topological insulator Bi2TeI
Nature Materials
19,
610-617
(2020) URL
C. Fornari, H. Bentmann, S. Morelhão, T. Peixoto, P. Rappl, A. Tcakaev, V. Zabolotnyy, M. Kamp, T. Lee, C. Min, P. Kagerer, R. Vidal, A. Isaeva, M. Ruck, V. Hinkov, F. Reinert, E. Abramof
Incorporation of Europium in Bi2Te3 Topological Insulator Epitaxial Films
Journal of Physical Chemistry C
124,
16048-16057
(2020) URL
A. Isaeva, R. Schönemann, T. Doert
Syntheses, Crystal Structure and Magnetic Properties of Tl9RETe6 (RE = Ce, Sm, Gd)
Crystals
10,
277/1-11
(2020) URL
A. Isaeva, M. Ruck
Crystal Chemistry and Bonding Patterns of Bismuth-Based Topological Insulators
Inorganic Chemistry
59,
3437-3451
(2020) URL
P. Kagerer, C. Fornari, S. Buchberger, S. Morelhão, R. Vidal, A. Tcakaev, V. Zabolotnyy, E. Weschke, V. Hinkov, M. Kamp, B. Büchner, A. Isaeva, H. Bentmann, F. Reinert
Molecular beam epitaxy of antiferromagnetic (MnBi2Te4)(Bi2Te3) thin films on BaF2 (111)
Journal of Applied Physics
128,
135303/1-7
(2020) URL
E. Haubold, A. Fedorov, F. Pielnhofer, I. Rusinov, T. Menshchikova, V. Duppel, D. Friedrich, R. Weihrich, A. Pfitzner, A. Zeugner, A. Isaeva, S. Thirupathaiah, Y. Kushnirenko, E. Rienks, T. Kim, E. Chulkov, B. Büchner, S. Borisenko
Possible experimental realization of a basic Z2 topological semimetal in GaGeTe
APL Materials
7,
121106/1-7
(2019) URL
R. Vidal, H. Bentmann, T. Peixoto, A. Zeugner, S. Moser, C. Min, S. Schatz, K. Kißner, M. Ünzelmann, C. Fornari, H. Vasili, M. Valvidares, K. Sakamoto, D. Mondal, J. Fujii, I. Vobornik, S. Jung, C. Cacho, T. Kim, R. Koch, C. Jozwiak, A. Bostwick, J. Denlinger, E. Rotenberg, J. Buck, M. Hoesch, F. Diekmann, S. Rohlf, M. Kalläne, K. Rossnagel, M. Otrokov, E. Chulkov, M. Ruck, A. Isaeva, F. Reinert
Surface states and Rashba-type spin polarization in antiferromagnetic MnBi2Te4(0001)
Physical Review B
100,
121104(R)/1-6
(2019) URL
G. Bastien, M. Roslova, M.H. Haghighi, K. Mehlawat, J. Hunger, A. Isaeva, T. Doert, M. Vojta, B. Büchner, A.U.B. Wolter
Spin-glass state and reversed magnetic anisotropy induced by Cr doping in the Kitaev magnet α−RuCl3
Physical Review B
99,
214410/1-11
(2019) URL
T. Menshchikova, I. Rusinov, P. Golub, I. Sklyadneva, R. Heid, A. Isaeva, V. Kuznetsov, E. Chulkov
Two- and one-dimensional quantum spin Hall states in stanene-functionalized GaTe and InTe matrices
Journal of Materials Chemistry C
7,
7929-7937
(2019) URL
M. Otrokov, I. Klimovskikh, H. Bentmann, D. Estyunin, A. Zeugner, Z. Aliev, S. Gaß, A.U.B. Wolter-Giraud, A. Koroleva, A. Shikin, M. Blanco-Rey, M. Hoffmann, I. Rusinov, A. Vyazovskaya, S. Eremeev, Y. Koroteev, V. Kuznetsov, F. Freyse, J. Sánchez-Barriga, I. Amiraslanov, M. Babanly, N. Mamedov, N. Abdullayev, V. Zverev, A. Alfonsov, V. Kataev, B. Büchner, E. Schwier, S. Kumar, A. Kimura, L. Petaccia, G. Di Santo, R. Vidal, S. Schatz, K. Kißner, M. Ünzelmann, C. Min, S. Moser, T. Peixoto, F. Reinert, A. Ernst, P. Echenique, A. Isaeva, E. Chulkov
Prediction and observation of an antiferromagnetic topological insulator
Nature
576,
416–422
(2019) URL
V. Falkowski, A. Zeugner, A. Isaeva, K. Wurst, M. Ruck, H. Huppertz
Synthesis and Characterization of the Manganese Hydroxide Halides Mn(OH)X (X = Br, I) and Crystal Structure of trans-MnBr2·4H2O
Journal of Inorganic and General Chemistry - Zeitschrift für anorganische und allgemeine Chemie ZAAC
645,
919-926
(2019) URL
D. Souchay, M. Nentwig, D. Günther, S. Keilholz, J. de Boor, A. Zeugner, A. Isaeva, M. Ruck, A.U.B. Wolter, B. Büchner, O. Oeckler
Layered manganese bismuth tellurides with GeBi4Te7- and GeBi6Te10-type structures: towards multifunctional materials
Journal of Materials Chemistry C
7,
9939-9953
(2019) URL
A. Zeugner, F. Nietschke, A.U.B. Wolter-Giraud, S. Gaß, R. Vidal, T. Peixoto, D. Pohl, C. Damm, A. Lubk, R. Hentrich, S. Moser, C. Fornari, C. Min, S. Schatz, K. Kißner, M. Ünzelmann, M. Kaiser, F. Scaravaggi, B. Rellinghaus, K. Nielsch, C. Hemker-Heß, B. Büchner, F. Reinert, H. Bentmann, O. Oeckler, T. Doert, M. Ruck, A. Isaeva
Chemical Aspects of the Candidate Antiferromagnetic Topological Insulator MnBi2Te4
Chemistry of Materials
31,
2795-2806
(2019) URL
R. Vidal, A. Zeugner, J. Facio, R. Ray, M.H. Haghighi, A. Wolter-Giraud, L.T. Corredor, F. Caglieris, S. Moser, T. Figgemeier, T. Peixoto, H. Vasili, M. Valvidares, S. Jung, C. Cacho, A. Alfonsov, K. Mehlawat, V. Kataev, C. Heß, M. Richter, B. Büchner, J. van den Brink, M. Ruck, F. Reinert, H. Bentmann, A. Isaeva
Topological Electronic Structure and Intrinsic Magnetization in MnBi4Te7: A Bi2Te3 Derivative with a Periodic Mn Sublattice
Physical Review X
9,
041065/1-13
(2019) URL
A. Polyakov, K. Mohseni, G.R. Castro, J. Rubio-Zuazo, A. Zeugner, A. Isaeva, Y.-J. Chen, C. Tusche, H.L. Meyerheim
A bismuth triiodide monosheet on Bi2Se3(0001)
Scientific Reports
9,
4052/1-9
(2019) URL
E. Kochetkova, F. Lukas, A. Popov, A. Isaeva
Crystal growth optimization on the topological ferromagnet Mn1±xSb2±xTe4 (x= 0-0.1, y=x* 2/3)
Conference program of ECCG7 ECCG7 7th European Conference on Crystal Growth,
[151-152],
(2022),
URL
A. Isaeva, M. Mehring
Bismut – das neue Zukunftselement?
Dialog in Anorganischer Chemie. GDCh-Wissenschaftsforum 2019
Aachen,
Germany,
14.09.2019
- 18.09.2019
A. Isaeva
A Family of Intrinsic Magnetic Topological Insulators(MnBi2Te4)(Bi2Te3)n (n =0, 1)
2019 Conference on Magnetism and Magnetic Materials (MMM)
Las Vegas,
USA,
04.11.2019
- 08.11.2019
A. Isaeva
Layered (MnBi2Te4)(Bi2Te3)n(n = 0, 1) as intrinsically magnetic topological materials
17th European Conference on Solid State Chemistry ECSSC
Lille,
France,
01.09.2019
- 04.09.2019
