We report the synthesis and physical properties of the new compound YNiSn2, which crystallizes in the orthorhombic \textit{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∗=0.08m0, 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.
@article{arxiv.2507.05500,
title = {YNiSn$_2$: A candidate Dirac semimetal},
author = {G. S. Freitas and C. Kaufmann Ribeiro and F. B. Carneiro and H. Pizzi and R. C. Santos and D. L. Passos and M. E. M. Ignacio and K. R. Pakuszewski and A. P. Machado and F. S. Oliveira and M. M. Piva and E. M. Bittar and C. Adriano and Y. Kopelevich and F. Ronning and J. D. Thompson and S. M. Thomas and P. F. S. Rosa and P. G. Pagliuso},
journal= {arXiv preprint arXiv:2507.05500},
year = {2026}
}