Enhancement of the Superconducting Transition Temperature with Hydrostatic Pressure in Ca_{3}Ir_{4}Sn_{13} Single Crystals

TL;DR

This study investigates how applying hydrostatic pressure up to 60 kbar affects the superconducting properties of Ca_{3}Ir_{4}Sn_{13} single crystals, revealing a dome-shaped T_c dependence linked to Fermi surface changes.

Contribution

It provides the first detailed pressure-dependent phase diagram for Ca_{3}Ir_{4}Sn_{13}, showing how T_c and T* evolve under pressure and suggesting a link to Fermi surface gapping.

Findings

T_c exhibits a dome-shaped dependence on pressure.

T* decreases as T_c increases under pressure.

Superconducting coherence length and Fermi velocity are affected by pressure.

Abstract

We report high pressure magnetic susceptibility and electrical resistivity measurements on Ca_{3}Ir_{4}Sn_{13} single crystals up to 60 kbar. These measurements allow us to follow the evolution of the superconducting critical temperature T_c, the resistivity anomaly temperature T*, the superconducting coherence length and the Fermi velocity under pressure. The pressure-temperature phase diagram constructed for Ca_{3}Ir_{4}Sn_{13} shows a dome-shaped pressure dependence of T_c. The initial rise in T_c, which is accompanied by a decrease in T*, is consistent with a reduction in the partial gapping of the Fermi surface under pressure.