Synthesis and Crystal Growth Research Team

Intermetallic Magnetic Materials Group

Head: Dr. S. Wurmehl

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Materials Development Group

Head: Dr. S. Aswartham

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Crystal Growth Group

Head: Dr. S. Seiro

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Exploratory Synthesis of Quantum Materials Group

Head: Jun.-Prof. Dr. A. Isaeva

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We work on the synthesis and crystal growth, chemical and structural characterization, and physical properties of i.a. transition metal oxides, intermetallics, chalcogenides and pnictides. Properties of interest include high spin polarization, itinerant antiferromagnetism, first order phase transitions, thermoelectricity, large coercitivity, unconventional superconductivity, frustrated magnetism, strong spin-orbital coupling and nontrivial topology. Our pool of facilities includes different types of furnaces working in various atmospheres, thermal analysis, powder and Laue backscattering x-ray diffraction. For a complete list of our facilities, see here.

Intermetallic Magnetic Materials Group

Our research is aiming at a fundamental understanding of functional properties of novel materials and exploration of their potential for applications. The basis of our research is sample with specific properties; hence, our work is dedicated to synthesis and crystal growth, full characterization and investigation of materials properties. This strategy involves four different, synergistic aspects: (i) development of synthesis and crystal growth routes towards samples with specific properties (ii) advanced characterization of composition, microstructure and crystal structure of our samples (iii) study of local magnetic, electronic and structural order using nuclear magnetic resonance spectroscopy (iv) measurement and analysis of macroscopic physical properties, which is done in close collaboration with in-house partners as well as with national and international collaborators, including numerous neutron and X-ray synchrotron experiments. Our work currently focuses on different classes of emergent materials: intermetallics showing high spin polarization, itinerant antiferromagnetism, first order phase transitions, thermoelectric and hard-magnetic properties, unconventional superconductors, magnetically frustrated materials and materials with strong spin-orbital coupling.

Group Leader: Dr. Sabine Wurmehl

Phone: +49 351 4659 519

Email

Structure-property relationship of Co2MnSi thin films in response to He+-irradiation

F. Hammerath, R. Bali, R. Huebner, M. R. D. Brandt, S. Rodan, K. Potzger, R. Boettger,
Y. Sakuraba, S. Wurmehl

Scientific reports 9, 2766 (2019)

 

Magnetic and magnetocaloric properties of the Co2-xMnxB system by experiment and density functional theory

S. Ener, M. Fries, F. Hammerath, I. Opahle, E. Simon, P. Fritsch, S. Wurmehl, H. Zhang,
O. Gutfleisch

Acta Mater. 165, 270 (2019)

Materials Development Group

Group Leader: Dr. Saicharan Aswartham

Phone: +49 351 4659 668

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R. Yadav, M.S. Eldeeb, R. Ray, S. Aswartham, M. Sturza, S. Nishimoto, J. van den Brink, L. Hozoi

Engineering Kitaev exchange in stacked iridate layers: impact of inter-layer species on in-plane magnetism
Chemical Science | Volume: 10 | Issue: 6 | P. 1866-1872 | URL

J. Zeisner, A. Alfonsov, S. Selter, S. Aswartham, M. Ghimire, M. Richter, J. van den Brink, B. Büchner, V. Kataev
Magnetic anisotropy and spin-polarized two-dimensional electron gas in the van der Waals ferromagnet Cr2Ge2Te6
Physical Review B | Volume: 99 | Issue: 16 | P. 165109/1-14 | URL

Y. Naidyuk, D. Bashlakov, O. Kvitnitskaya, S. Aswartham, I. Morozov, I. Chernyavskii, G. Shipunov, G. Fuchs, S. Drechsler, R. Hühne, K. Nielsch, B. Büchner, D. Efremov
Yanson point-contact spectroscopy of Weyl semimetal WTe2
2D Materials | Volume: 6 | Issue: 4 | P. 045012/1-7 | URL

P. Materne, W. Bi, J. Zhao, M. Hu, M. Amigo, S. Seiro, S. Aswartham, B. Büchner, E. Alp
Bandwidth controlled insulator-metal transition in BaFe2S3: A Mössbauer study under pressure
Physical Review B | Volume: 99 | Issue: 2 | P. 020505/1-4 | URL

J.M. Ok, S.-H. Baek, D.V. Efremov, R. Kappenberger, S. Aswartham, J.S. Kim, J. van den Brink, B. Büchner
Nematicity and magnetism in LaFeAsO single crystals probed by 75As nuclear magnetic resonance
Physical Review B | Volume: 97 | Issue: 18 | P. 180405/1-5 | URL

S. Thirupathaiah, D. Efremov, Y. Kushnirenko, E. Haubold, T. Kim, B. Pienning, I. Morozov, S. Aswartham, B. Büchner, S. Borisenko
Absence of Dirac fermions in layered BaZnBi2
Physical Review Materials | Volume: 3 | Issue: 2 | P. 024202/1-8 | URL

M. Moroni, G. Prando, S. Aswartham, I. Morozov, Z. Bukowski, B. Büchner, H. Grafe, P. Carretta
Charge and nematic orders in AFe2As2(A=Rb,Cs) superconductors
Physical Review B | Volume: 99 | Issue: 23 | P. 235147/1-7 | URL

Crystal Growth Group

We grow and characterize single crystals of oxides, sulfides and intermetallic materials exhibiting a variety of properties such as unconventional superconductivity, complex magnetism or ionic conduction.  We use the floating zone technique in four optical floating zone furnaces  (including a high-pressure mirror furnace reaching 150 bar), the Bridgman and the flux techniques.

Group Leader: Dr. S. Seiro

Email

Phone: +49 351 4659 581

Laser-diode-heated floating-zone crystal growth of ErVO3, P. Telang, A. Maljuk, D. Rout, R. Hu, M. Skoulatos, K. Karmakar, S. Seiro, B. Roessli, U. Stuhr, B. Büchner, S.-W. Cheong and S. Sing, J. Cryst. Growth 507, 406 (2019)

Bandwidth controlled insulator-metal transition in BaFe2S3: A Mössbauer study under pressure, P.  Materne, W. Bi, J. Zhao, M. Yu Hu, M. L.  Amigó, S. Seiro, S.  Aswartham, B. Büchner, and E. E. Alp, Phys. Rev. B 99, 020505(R)  (2019)

Exploratory Synthesis of Quantum Materials Group

This research group led by Jun.-Prof. Dr. Anna Isaeva focuses on the materials aspects of inorganic compounds, primarily, on the explorative synthesis and comprehensive characterization of topologically non-trivial materials. The group is associated to the Chair for Synthesis and Crystal Growth of Quantum Materials, founded in 2019 as a joint appointment between the Technische Universität Dresden and the Leibniz IFW Dresden.

Group Leader: Jun.-Prof. Dr. Anna Isaeva

Email

Phone: +49 351 4659 309

Prediction and observation of an antiferromagnetic topological insulator M. M. Otrokov, I. I. Klimovskikh, H. Bentmann, D. Estyunin, A. Zeugner, Z. S. Aliev, S. Gaß, A. U. B. Wolter, A. V. Koroleva, A. M. Shikin, M. Blanco-Rey, M. Hoffmann, I. P. Rusinov, A. Yu. Vyazovskaya, S. V. Eremeev, Yu. M. Koroteev, V. M. Kuznetsov, F. Freyse, J. Sánchez-Barriga, I. R. Amiraslanov, M. B. Babanly, N. T. Mamedov, N. A. Abdullayev, V. N. Zverev, A. Alfonsov, V. Kataev, B. Büchner, E. F. Schwier, S. Kumar, A. Kimura, L. Petaccia, G. Di Santo, R. C. Vidal, S. Schatz, K. Kißner, M. Ünzelmann, C. H. Min, Simon Moser, T. R. F. Peixoto, F. Reinert, A. Ernst, P. M. Echenique, A. Isaeva, and E. V. Chulkov, Nature 576, 416 (2019)

Surface states and Rashba-type spin polarization in antiferromagnetic MnBi2Te4(0001), R. C. Vidal, H. Bentmann, T. R. F. Peixoto, A. Zeugner, S. Moser, C.-H. Min, S. Schatz, K. Kißner, M. Ünzelmann, C. I. Fornari, H. B. Vasili, M. Valvidares, K. Sakamoto, D. Mondal, J. Fujii, I. Vobornik, S. Jung, C. Cacho, T. K. Kim, R. J. Koch, C. Jozwiak, A. Bostwick, J. D. Denlinger, E. Rotenberg, J. Buck, M. Hoesch, F. Diekmann, S. Rohlf, M. Kalläne, K. Rossnagel, M. M. Otrokov, E. V. Chulkov, M. Ruck, A. Isaeva, and F. Reinert, Phys. Rev. B 100, 121104 (2019)

Two- and one-dimensional quantum spin Hall states in stanene-functionalized GaTe and InTe matrices  T. V. Menshchikova, I. P. Rusinov, P. Golub, I. Yu. Sklyadneva,  R. Heid,   A. Isaeva,  V. M. Kuznetsov  and  E. V. Chulkov, J. Mater. Chem. C 7, 7929 (2019)