A large anomalous Hall effect (AHE) has been observed in ferromagnetic Fe3Sn2 with breathing kagome bilayers. To understand the underlying mechanism for this, we investigate the electronic structure of Fe3Sn2 by angle-resolved photoemission spectroscopy (ARPES). In particular, we use both vacuum ultraviolet light (VUV) and soft x ray (SX), which allow surface-sensitive and relatively bulk-sensitive measurements, respectively, and distinguish bulk states from surface states, which should be unlikely related to the AHE. While VUV-ARPES observes two-dimensional bands mostly due to surface states, SX-ARPES reveals three-dimensional band dispersions with a periodicity of the rhombohedral unit cell in the bulk. Our data show a good consistency with a theoretical calculation based on density functional theory, suggesting a possibility that Fe3Sn2 is a magnetic Weyl semimetal.
@article{arxiv.2001.08925,
title = {Three-dimensional electronic structure in ferromagnetic $\textrm{Fe}_3\textrm{Sn}_2$ with breathing kagome bilayers},
author = {Hiroaki Tanaka and Yuita Fujisawa and Kenta Kuroda and Ryo Noguchi and Shunsuke Sakuragi and Cédric Bareille and Barnaby Smith and Cephise Cacho and Sung Won Jung and Takayuki Muro and Yoshinori Okada and Takeshi Kondo},
journal= {arXiv preprint arXiv:2001.08925},
year = {2023}
}