Superconductivity in the nonsymmorphic line-nodal compound CaSb2

Atsutoshi Ikeda; Mayo Kawaguchi; Shun Koibuchi; Tatsuki Hashimoto; Takuto Kawakami; Shingo Yonezawa; Masatoshi Sato; Yoshiteru Maeno

doi:10.1103/PhysRevMaterials.4.041801

Superconductivity in the nonsymmorphic line-nodal compound CaSb2

Atsutoshi Ikeda, Mayo Kawaguchi, Shun Koibuchi, Tatsuki Hashimoto, Takuto Kawakami, Shingo Yonezawa, Masatoshi Sato, Yoshiteru Maeno

DOI 10.1103/PhysRevMaterials.4.041801 · Physical Review Materials

T1

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Abstract

We found superconductivity in CaSb2 with the transition temperature of 1.7 K by means of electrical-resistivity, magnetic-susceptibility, and specific-heat measurements. This material crystallizes in a nonsymmorphic structure and is predicted to have multiple Dirac nodal lines in the bulk electronic band structure protected by symmetry even in the presence of spin-orbit coupling. We discuss a possible topological superconductivity for the quasi-two-dimensional band originating mainly from one of the antimony sites.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CaSb2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.7	Pressure not reported	onset
CaSb2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.8	Pressure not reported	onset
CaSb2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.5	Pressure not reported	onset