Pressure Effect on the superconducting properties of LaO_{1-x}F_{x}FeAs(x=0.11) superconductor

TL;DR

This study investigates how applying hydrostatic pressure up to 1.03 GPa enhances the transition temperature of LaO_{1-x}F_{x}FeAs superconductor, revealing pressure's role in optimizing superconducting phases.

Contribution

It provides experimental evidence that hydrostatic pressure linearly increases T_c and influences the superconducting phase composition in LaO_{1-x}F_{x}FeAs.

Findings

T_c increases by about 1.2 K/GPa under pressure

Superconducting state is complex and pressure affects phase distribution

Pressure pushes low T_c phases toward the optimal superconducting phase

Abstract

Diamagnetic susceptibility measurements under high hydrostatic pressure (up to 1.03 GPa) were carried out on the newly discovered Fe-based superconductor LaO_{1-x}F_{x}FeAs(x=0.11). The transition temperature T_c, defined as the point at the maximum slope of superconducting transition, was enhanced almost linearly by hydrostatic pressure, yielding a dT_c/dP of about 1.2 K/GPa. Differential diamagnetic susceptibility curves indicate that the underlying superconducting state is complicated. It is suggested that pressure plays an important role on pushing low T_c superconducting phase toward the main (optimal) superconducting phase.