The pressure-induced enhancement of superconducting properties of single-crystalline FeTe0.5Se0.5

TL;DR

This study investigates how applying pressure up to 11.3 kbar enhances various superconducting properties of FeTe0.5Se0.5, revealing increased carrier density and critical current density, with implications for understanding pressure effects on superconductivity.

Contribution

It provides detailed measurements of pressure effects on superconducting parameters in FeTe0.5Se0.5, highlighting the significant enhancement of critical current density and carrier density under pressure.

Findings

Superconducting critical temperature increases with pressure.

Critical current density increases by at least an order of magnitude.

Superconducting carrier density shows more pronounced growth than Tc.

Abstract

The pressure dependence, up to 11.3 kbar, of basic parameters of the superconducting state, such as the critical temperature (Tc), the lower and the upper critical fields, the coherence length, the penetration depth, and their anisotropy, was determined from magnetic measurements performed for two singlecrystalline samples of FeTe0.5Se0.5. We have found pressure-induced enhancement of all of the superconducting state properties, which entails a growth of the density of superconducting carriers. However, we noticed more pronounced increase in superconducting carrier density under pressure than that in the critical temperature what may indicate an appearance of a mechanism limiting the increase of Tc with pressure. We have observed that the critical current density increases under pressure by at least one order of magnitude.