Hydrostatic pressure effect on Tc of new BiS2 based Bi4O4S3 and NdO0.5F0.5BiS2 layered superconductors

TL;DR

This study examines how hydrostatic pressure influences the superconducting transition temperature (Tc) of new layered BiS2-based superconductors, revealing different pressure-dependent behaviors for Bi4O4S3 and NdO0.5F0.5BiS2.

Contribution

It provides the first detailed analysis of pressure effects on Tc in Bi4O4S3 and NdO0.5F0.5BiS2 superconductors, highlighting their contrasting responses to external pressure.

Findings

Bi4O4S3 Tc decreases slightly with pressure.

NdO0.5F0.5BiS2 Tc initially increases then decreases under pressure.

Pressure effects may relate to changes in charge carrier density.

Abstract

We investigate the external hydrostatic pressure effect on the superconducting transition temperature (Tc) of new layered superconductors Bi4O4S3 and NdO0.5F0.5BiS2. Though the Tc is found to have moderate decrease from 4.8 K to 4.3 K (dTconset/dP = -0.28 K/GPa) for Bi4O4S3 superconductor, the same increases from 4.6 K to 5 K (dTconset/dP = 0.44 K/GPa) upto 1.31 GPa followed by a sudden decrease from 5 K to 4.7 K upto 1.75 GPa for NdO0.5F0.5BiS2 superconductor. The variation of Tc in these systems may be correlated to increase or decrease of the charge carriers in the density of states under externally applied pressure.