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arXiv · 1910.13057

Ferromagnetic van der Waals compound MnSb$_{1.8}$Bi$_{0.2}$Te$_4$

Yangyang Chen·Ya-Wen Chuang·Seng Huat Lee·Yanglin Zhu·Kevin Honz·Yingdong Guan·Yu Wang·Ke Wang·Zhiqiang Mao·Colin Heikes·P. Quarterman·Pawel Zajdel·Julie A. Borchers·William Ratcliff II·Jun Zhu
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Abstract

The intersection of topology and magnetism represents a new playground to discover novel quantum phenomena and device concepts. In this work, we show that a van der Waals compound MnSb$_{1.8}$Bi$_{0.2}$Te$_4$ exhibits a ferromagnetic ground state with a Curie temperature of 26 K, in contrast to the antiferromagnetic order previously found for other members of the Mn(Sb, Bi)$_2$Te$_4$ family. We employ magneto-transport, bulk magnetization and neutron scattering studies to illustrate the magnetic and electrical properties of MnSb$_{1.8}$Bi$_{0.2}$Te$_4$ and report on the observation of an unusual anomalous Hall effect. Our results are an important step in the synthesis and understanding of ferromagnetic topological insulators.

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Yangyang Chen, Ya-Wen Chuang, Seng Huat Lee, Yanglin Zhu, Kevin Honz, Yingdong Guan, Yu Wang, Ke Wang, Zhiqiang Mao, Colin Heikes, P. Quarterman, Pawel Zajdel, Julie A. Borchers, William Ratcliff II, Jun Zhu. 2019-10-29. Ferromagnetic van der Waals compound MnSb$_{1.8}$Bi$_{0.2}$Te$_4$. https://doi.org/10.1103/physrevmaterials.4.064411

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