Electronic state of superconductivity in line nodal material CaSb2 under pressure up to 4.2 GPa

Abstract

We report the results of resistance measurements under pressure up to $4.2\mathrm{GPa}$ on single-crystalline ${\mathrm{CaSb}}_2$ , which shows the maximum of superconducting transition temperature $T_{\mathrm{c}}$ at $3.1\mathrm{GPa}$. At room temperature, $R(P)$ shows a subtle anomaly at $3.1\mathrm{GPa}$. However, Bloch-Grüneisen analysis of $R(T)$ indicates that the electronic state does not change significantly across $3.1\mathrm{GPa}$.

2 pages, 2figures