Pressure shift of the superconducting T_c of LiFeAs

TL;DR

This study examines how applying hydrostatic pressure up to 1.8 GPa affects the superconducting transition temperature of LiFeAs, revealing a linear decrease and suggesting its relation to other iron-based superconductors.

Contribution

It provides the first detailed measurement of pressure dependence of T_c in LiFeAs, highlighting its high-pressure behavior and analogy to other iron arsenide superconductors.

Findings

T_c decreases linearly with pressure at 1.5 K/GPa

LiFeAs is analogous to SrFe_2As_2 and BaFe_2As_2 under high pressure

High ambient T_c suggests potential for pressure tuning

Abstract

The effect of hydrostatic pressure on the superconductivity in LiFeAs is investigated up to 1.8 GPa. The superconducting transition temperature, T_c, decreases linearly with pressure at a rate of 1.5 K/GPa. The negative pressure coefficient of T_c and the high ambient pressure T_c indicate that LiFeAs is the high-pressure analogue of the isoelectronic SrFe_2As_2 and BaFe_2As_2.