YNiSn2: A candidate Dirac semimetal
Abstract
We report the synthesis and physical properties of the new compound YNiSn2, which crystallizes in the orthorhombic Cmcm structure. The material exhibits semimetallic behavior and develops a giant positive magnetoresistance approaching 1200\% at B = 16 T. Pronounced de Haas-van Alphen and Shubnikov-de Haas oscillations reveal a dominant quasi-two-dimensional Fermi surface with an exceptionally small cyclotron effective mass of m* = 0.08 m0, indicating light carriers and a tiny Fermi surface pocket. The strong anisotropy revealed by Shubnikov-de Haas quantum oscillation measurements highlights the low-dimensional electronic character of YNiSn2, positioning it as a promising Dirac semimetal candidate.
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