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Research Highlight | Materials Science Division

A new three-dimensional subsulfide Ir2In8S with Dirac semimetal behavior

In a study published in the Journal of the American Chemical Society, researchers discovered a semimetal with a novel tetragonal structure, offering a new family of material systems to advance the field of topological materials.

Scientific Achievement

We discovered a new three dimensional subsulfide Ir2In8S that has metal-metal and metal-chalcogenide bonding in the same compound. Ir2In8S is a Dirac semimetal candidate with two symmetry-protected crossings near the Fermi level.

Significance and Impact

Currently available Dirac semimetal candidate materials are limited in their structural diversity, with most belonging to a handful of the same structure types. Ir2In8S crystallizes in a new tetragonal structure type, offering a new material system to advance the field of topological materials.

Research Details

  • Indium metal flux stabilizes this novel subchalcogenide.
  • Ir2In8S has high electron mobility (~10000 cm2/Vs at 1.8 K) and large, anisotropic angular magnetoresistance with a maximum of ~6000%.
  • Shubnikov-de Haas oscillations suggest topological character.  

DOI10.1021/jacs.9b10147

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