Abstract
Because of their unique electronic structure and peculiar physical properties, topological materials have attracted considerable attention in condensed matter physics. In both physics and material science, exploring materials with a topological state or Dirac fermions near the Fermi level is important. Here, we report the transport evidence of the topological state for ${\mathrm{Ag}}_{3}\mathrm{Sn}$. Under a high magnetic field, we observed clear Shubnikov--de Haas (SdH) oscillations with three major frequencies and relatively small effective masses. Our SdH quantum oscillation analyses reveal that the Berry phase of the $\ensuremath{\gamma}$ band is very close to the nontrivial value $\ensuremath{\pi}$; the nonzero Berry phase for the $\ensuremath{\alpha}$ band indicates the ${\mathrm{Ag}}_{3}\mathrm{Sn}$ alloy to be a possible topological material. Moreover, we performed angle-resolved magnetoresistance (MR) measurements. Note that MR displays an unusual angular dependence, which can be tuned from twofold to fourfold symmetry by temperature and field. This feature makes ${\mathrm{Ag}}_{3}\mathrm{Sn}$ a candidate for valleytronics.
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