Ferromagnetic van der Waals compound MnSb1.8Bi0.2Te4

The coexistence of topology and magnetism in the same material offers the possibility to realize novel quantum phenomena such as the quantum anomalous Hall effect. Van der Waals magnetic compounds in the form of MnSb_xBi_2-xTe₄ are promising candidates. In this work, we show that a Sb-rich composition MnSb_1.8Bi_0.2Te₄ exhibits a ferromagnetic ground state below a Curie temperature of 26 K, in contrast to antiferromagnetic states found in previous studies of this compound family. Magneto-transport measurements are performed on flakes that are ~ 100 nm thick and prepared in an argon atmosphere. At low temperature, pronounced hysteresis is observed in magnetic field sweeps of R_xy and R_xx. A remnant magnetization of M₀ = 0.6 μ_B/Mn, is extracted from bulk magnetization measurements. The presence of a major ferromagnetic phase is further confirmed by neutron diffraction studies. An excess signal beyond the conventional anomalous Hall effect is observed at T < 12 K. We discuss the implications of our results.

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Bulletin of the American Physical Society

APS March Meeting 2020

Volume 65, Number 1

Monday–Friday, March 2–6, 2020; Denver, Colorado

Session L59: MnBi2Te4 and Related Compounds: Bulk Properties

Abstract: L59.00005 : Ferromagnetic van der Waals compound MnSb1.8Bi0.2Te4

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Abstract: L59.00005 : Ferromagnetic van der Waals compound MnSb_1.8Bi_0.2Te₄