Peak in the superconducting transition temperature of the nonmagnetic topological line-nodal material CaSb${}_2$ under pressure

Abstract

Investigating the pressure dependence of the superconducting (SC) transition temperature $T_{\mathrm{c}}$ is crucial for understanding the SC mechanism. Herein, we report on the pressure dependence of $T_{\mathrm{c}}$ in the nonmagnetic topological line-nodal material CaSb${}_2$, based on measurements of electric resistance and alternating current magnetic susceptibility. $T_{\mathrm{c}}$ initially increases with increasing pressure and peaks at $\sim$ 3.1~GPa. With a further increase in pressure, $T_{\mathrm{c}}$ decreases and finally becomes undetectable at 5.9~GPa. Because no signs of phase transition or Lifshitz transition are observed in the normal state, the peculiar peak structure of $T_{\mathrm{c}}$ suggests that CaSb${}_2$ has an unconventional SC character.

arXiv comment5 pages, 5 figures

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• Fermiology of a topological line-nodal compound CaSb2 and its implication to superconductivity: angle-resolved photoemission study
• Pressure-induced volumetric negative thermal expansion in CoZr2 superconductor
• 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${}_2$