High pressure investigation of superconducting signatures in CeCu$_{2}$Si$_{2}$ : ac- magnetic susceptibility and heat capacity, resistivity and thermopower

TL;DR

This study investigates the superconducting properties of CeCu$_{2}$Si$_{2}$ under high pressure using multiple probes, revealing consistent superconducting signatures but no susceptibility anomaly at the transition onset.

Contribution

It provides comprehensive high-pressure measurements of multiple superconducting signatures on a single sample, with novel insights into susceptibility behavior near $T_c$.

Findings

Superconducting transition confirmed by susceptibility, heat capacity, and resistivity.

No susceptibility anomaly observed at the resistive transition onset.

Superconducting signatures are consistent across different measurement techniques.

Abstract

Taking advantage of a novel multiprobe setup we have measured, on a unique sample, the ac-magnetic susceptibility, the resistivity, the ac-specific heat and the thermopower of the superconductor heavy fermion CeCu$_{2}$Si$_{2}$ under pressure up to 5.1 GPa. At the superconducting transition temperature $T_c$, the Meissner signal corresponds to that expected for the sample volume and coincides with the specific heat jump and the resistive transition completion temperatures. Differing from previous observations, here the susceptibility measurements did not reveal any anomaly in the vicinity of the resistive transition onset.