Effects of pressure-induced phase transitions on superconductivity in the single crystal Fe1.02Se

TL;DR

This study investigates how pressure-induced structural phase transitions affect the superconducting properties of Fe1.02Se, revealing a significant Tc increase at moderate pressures and suppression at higher pressures due to structural changes.

Contribution

It provides new insights into the relationship between structural phase transitions and superconductivity in Fe1.02Se under high pressure.

Findings

Tc increases from 7 K to 30 K at 0.5-1 GPa

Superconductivity is suppressed near 7 GPa

Structural transition from orthorhombic to hexagonal occurs

Abstract

The temperature dependence of the ac susceptibility for single-crystalline Fe1.02Se has been measured at high pressures to 6.7 GPa. The superconducting transition temperature Tc displays a large increase from 7 K to 30 K in the two-phase region at 0.5 - 1 GPa. Further increase in pressure results in the decrease of Tc. The destruction of superconductivity near 7 GPa is presumably related to a structural transition from orthorhombic to hexagonal. .