Pressure Study of Superconducting Oxypnictide LaFePO

TL;DR

This study investigates how applying high pressure affects the superconducting transition temperature and structural properties of LaFePO, revealing a significant increase in Tc up to 0.8 GPa and providing insights into its pressure-dependent behavior.

Contribution

It presents the first detailed high-pressure measurements of LaFePO's superconducting and structural properties, highlighting the pressure-induced enhancement of Tc.

Findings

Superconducting transition temperature (Tc) increases steeply with pressure.

Maximum Tc of 8.8 K observed at 0.8 GPa.

Linear compressibility of LaFePO measured up to 10 GPa.

Abstract

Electrical resistivity and magnetic susceptibility measurements under high pressure were performed on an iron-based superconductor LaFePO. A steep increase in superconducting transition temperature (Tc) of LaFePO with dTc/dP > 4 K/GPa to a maximum of 8.8 K for P = 0.8 GPa was observed. These results are similar to isocrystalline LaFeAsO1-xFx system reported previously. X-ray diffraction measurements were also performed under high pressure up to 10 GPa, where linear compressibility ka and kc are presented.