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MA: Fachverband Magnetismus

MA 7: Topological Phenomena (joint session MA/TT)

MA 7.5: 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 Büchner^1,4, and Anna Isaeva^1,4 — ¹Institute 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.