High-Pressure Electrical Resistivity Measurements of EuFe2As2 Single Crystals

TL;DR

This study investigates how applying high pressure affects the electrical resistivity and superconducting properties of EuFe2As2 single crystals, revealing pressure-induced suppression of magnetic/structural transitions and emergence of superconductivity.

Contribution

It provides new insights into pressure-induced superconductivity in EuFe2As2 and compares effects across samples with different residual resistivity ratios.

Findings

Pressure suppresses magnetic/structural transition temperature T0.

Superconductivity emerges near critical pressures (~2.5-2.7 GPa).

Critical pressure slightly varies with residual resistivity ratio RRR.

Abstract

High-pressure electrical resistivity measurements up to 3.0GPa have been performed on EuFe2As2 single crystals with residual resistivity ratios RRR=7 and 15. At ambient pressure, a magnetic / structural transition related to FeAs-layers is observed at T0 =190K and 194K for samples with RRR=7 and 15, respectively. Application of hydrostatic pressure suppresses T0, and then induces similar superconducting behavior in the samples with different RRR values. However, the critical pressure 2.7GPa, where T0=0, for the samples with RRR=15 is slightly but distinctly larger than 2.5GPa for the samples with RRR=7.