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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.8: Poster

Donnerstag, 19. März 2020, 15:00–19:00, P2/EG

Electron spin resonance spectroscopy measurement of a magnetic topological insulator material MnBi₄Te₇ — •Kavita Mehlawat^1,3, Alexey Alfonsov^1,3, Anna Isaeva^1,2,3, Bernd Buechner^1,2,3, and Vladislav Kataev^1,3 — ¹Institute for Solid State and Materials Research, Leibniz IFW Dresden, Dresden, Germany — ²Faculty of Physics, Technische Universitaet Dresden, Dresden, Germany — ³Wuerzburg-Dresden Cluster of Excellence ct.qmat

The van der Waals compound MnBi₄Te₇ belongs to the family of (Bi₂Te₃)_n(MnBi₂Te₄), (n = 0, 1, 2) heterostructures and is the first example of a compound which features both, the intrinsic net magnetization and band inversion. Static magnetic susceptibility (χ) and magnetization (M) measurements as a function of the applied field (H) on MnBi₄Te₇ show an antiferromagnetic state at T_N = 13 K and a ferromagnetic-like hysteresis occurring upon cooling below 5 K [1]. We performed electron spin resonance (ESR) spectroscopy measurements to explore the dynamic magnetic properties of MnBi₄Te₇. From high-frequency ESR measurements, we obtain evidence that MnBi₄Te₇ is an easy-axis type ferromagnet and ferromagnetic spin correlations persist up to T = 30 K on the time scale of an ESR experiment (10⁻¹⁰ - 10⁻¹¹ s).

[1] Raphael C. Vidal et. al, arXiv:1906.08394