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

TL;DR

This study investigates how applying pressure up to 4.2 GPa affects the superconducting properties of CaSb2, revealing a maximum transition temperature at 3.1 GPa without significant electronic state changes.

Contribution

It provides new insights into pressure-induced superconductivity behavior in CaSb2, including the pressure dependence of $T_c$ and electronic state stability.

Findings

Superconducting transition temperature peaks at 3.1 GPa.

Electronic state remains stable across the pressure range.

Subtle resistance anomaly observed at 3.1 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-Gr\"uneisen analysis of $R(T)$ indicates that the electronic state does not change significantly across $3.1\,\mathrm{GPa}$.