<研究ノート>非共型な結晶対称性に保護されたディラック・ラインをもつトポロジカル物質CaSb₂における超伝導の発見

Abstract

We discovered superconductivity in CaSb₂ with a transition onset of 1.8 K. This compound crystallizes in a non-symmorphic structure and is predicted to have topologically protected Dirac lines in its bulk electronic band structure. The Dirac-line material is the topological material of the next generation, following the topological insulator, the topological crystalline insulator, and the Dirac/Weyl semimetal. We hope that this discovery will trigger further experimental and theoretical investigations into unconventional superconductivity in Dirac-line materials.