Superconductivity in the nonsymmorphic line-nodal compound CaSb${}_2$

Abstract

We found superconductivity in CaSb${}_2$ 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-2-dimensional band originating mainly from one of the antimony sites.

arXiv comment7 pages, 5 figures

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• Peak in the superconducting transition temperature of the nonmagnetic topological line-nodal material CaSb${}_2$ under pressure
• Quasi-2D Fermi surface of superconducting line-nodal metal CaSb${}_2$
• Superconductivity and Quantum Oscillations in Single Crystals of the Compensated Semimetal CaSb${}_2$
• Superconductivity in the nodal-line compound La${}_3$Pt${}_3$Bi${}_4$
• Nodeless superconductivity in the topological nodal-line semimetal CaSb2
• Quantum transport observed in films of magnetic topological semimetal EuSb${}_2$
• Fermiology of a topological line-nodal compound CaSb2 and its implication to superconductivity: angle-resolved photoemission study
• Experimental nuclear quadrupole resonance and computational study of the structurally refined topological semimetal TaSb${}_2$
• Pressure evolution of the normal- and superconducting-state properties of the line-nodal material CaSb${}_2$ revealed by ${}^{123}$Sb nuclear quadrupole resonance
• Subtle Structural Anomaly under Compression in Line-Nodal CaSb${}_2$
• Localization and Topology in Noncentrosymmetric Superconductors with Disorder