Topological insulator with antiferromagnetic order can serve as an ideal platform for the realization of axion electrodynamics. In this paper, we report a systematic study of the axion topological insulator candidate EuIn2As2. A linear energy dispersion across the Fermi level confirms the existence of the proposed hole-type Fermi pocket. Spin-flop transitions occur with magnetic fields applied within the ab-plane while are absent for fields parallel to the c-axis. Anisotropic magnetic phase diagrams are observed and the orientation of the ground magnetic moment is found to be within the ab-plane. The magnetoresistivity for EuIn2As2 behaves non-monotonic as a function of field strength. It exhibits angular dependent evolving due to field-driven and temperature-driven magnetic states. These results indicate that the magnetic states of EuIn2As2 strongly affect the transport properties as well as the topological nature.
@article{arxiv.1911.01896,
title = {In-plane antiferromagnetic moments in axion topological insulator candidate EuIn$_2$As$_2$},
author = {Yang Zhang and Ke Deng and Xiao Zhang and Meng Wang and Yuan Wang and Cai Liu and Jia-Wei Mei and Shiv Kumar and Eike F. Schwier and Kenya Shimada and Chaoyu Chen and Bing Shen},
journal= {arXiv preprint arXiv:1911.01896},
year = {2020}
}