Dirac and Weyl semimetals host exotic quasiparticles with unconventional transport properties, such as high magnetoresistance and carrier mobility. Recent years have witnessed a huge number of newly predicted topological semimetals from existing databases; however, experimental verification often lags behind such predictions. Common reasons are synthetic difficulties or the stability of predicted phases. Here, we report the synthesis of the type-II Dirac semimetal Ir2In8S, an air-stable compound with a new structure type. This material has two Dirac crossings in its electronic structure along the &-Z direction of the Brillouin zone. We further show that Ir2In8S has a high electron carrier mobility of ∼10 »000 cm2/(V s) at 1.8 K and a large, nonsaturating transverse magnetoresistance of ∼6000% at 3.34 K in a 14 T applied field. Shubnikov de-Haas oscillations reveal several small Fermi pockets and the possibility of a nontrivial Berry phase. With its facile crystal growth, novel structure type, and striking electronic structure, Ir2In8S introduces a new material system to study topological semimetals and enable advances in the field of topological materials.
ASJC Scopus subject areas
- Colloid and Surface Chemistry
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Khoury, J. F. (Contributor), Rettie, A. J. E. (Contributor), Khan, M. A. (Contributor), Ghimire, N. J. (Contributor), Robredo, I. (Contributor), Pfluger, J. E. (Contributor), Pal, K. (Contributor), Wolverton, C. M. (Contributor), Bergara, A. (Contributor), Jiang, J. S. (Contributor), Schoop, L. M. (Contributor), Vergniory, M. G. (Contributor), Mitchell, J. F. (Contributor), Chung, D. Y. (Contributor), Kanatzidis, M. (Contributor), Chung, D. Y. (Contributor) & Kanatzidis, M. G. (Contributor), FIZ Karlsruhe - Leibniz Institute for Information Infrastructure, 2019