Pressure Effect on Superconductivity of Iron-based Arsenic-oxide ReFeAsO0.85 (Re=Sm and Nd)

TL;DR

This study investigates how applying pressure affects the superconducting transition temperature in fluorine-free ReFeAsO0.85 compounds, revealing a decrease in Tc with pressure and highlighting the role of layer deformation.

Contribution

It provides experimental and theoretical insights into pressure effects on Tc in ReFeAsO0.85 without fluorine doping, emphasizing the influence of layer deformation.

Findings

Tc decreases monotonously with pressure

Different pressure coefficients for Sm and Nd compounds

Electron density of states decreases with pressure

Abstract

Here we report pressure effect on superconducting transition temperature (Tc) of ReFeAsO0.85 (Re= Sm and Nd) system without fluorine doping. In-situ measurements under high pressure showed that Tc of the two compounds decrease monotonously over the pressure range investigated. The pressure coefficients dTc/dP in SmFeAsO0.85 and Nd FeAsO0.85 were different, revealing the important influence of the deformation in layers on Tc. Theoretical calculations suggested that the electron density of states decrease with increasing pressure, following the same trend of experimental data.