Three-dimensional electronic structure in ferromagnetic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>Fe</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>Sn</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math> with breathing kagome bilayers
Hiroki Tanaka, Yuita Fujisawa, Kenta Kuroda, Ryo Noguchi, Shunsuke Sakuragi, Cédric Bareille, B. R. M. Smith, Céphise Cacho, Sung Won Jung, Takayuki Muro, Yoshinori Okada, Takeshi Kondo
Abstract
A large anomalous Hall effect (AHE) has been observed in ferromagnetic ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ with breathing kagome bilayers. To understand the underlying mechanism for this, we investigate the electronic structure of ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ 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 ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ is a magnetic Weyl semimetal.