Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 8: Topological Phenomena (joint session MA/TT)

TT 8.5: Vortrag

Montag, 16. März 2020, 10:30–10:45, POT 6

Intriguing magnetic ground state of MnBi4Te7: a Bi2Te3 derivative with a periodic Mn sublattice — •Laura T. Corredor-Bohórquez1, Vilmos Kocsis1, Anja U. B. Wolter1, M. Hossein Haghighi1, Nicolás Pérez2, Jorge Facio3, Bernd Büchner1,4, and Anna Isaeva1,41Institute for Solid State and Materials Research, Leibniz IFW Dresden, 01069 Dresden, Germany — 2Institute for Metallic Materials, Leibniz IFW Dresden, 01069, Dresden, Germany — 3Institute for Theoretical Solid State Physics, Leibniz IFW Dresden, 01069, Dresden, Germany — 4Faculty of Physics, Technische Universität Dresden, Dresden, Germany

Materials with a combination of non–trivial band topology and long-range magnetic order have been long desired, since it is expected the appearance of novel spintronic phenomena. Following theoretical advances material candidates are emerging. MnBi2Te4 is the first antiferromagnetic topological insulator [1] and the progenitor of a modular (Bi2Te3)n(MnBi2Te4) series. For n = 1, it is established an antiferromagnetic state below 13 K followed by a state with net magnetization and ferromagnetic–like hysteresis below 5 K. Through static and dynamic magnetic characterization of single crystals, we build up a picture of the intriguing magnetic ground state of this new compound. Our results render MnBi4Te7 as a band inverted material with an intrinsic net magnetization and a complex magnetic phase diagram providing a versatile platform for the realization of different topological phases. [1] M. Otrokov et al. Nature (2019), in press. Arxiv.org:1809.07389.

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