Pressure induced superconductivity in BaFe2As2 single crystal

TL;DR

This study investigates how applying pressure induces superconductivity in BaFe2As2 single crystals, revealing a pressure-dependent transition temperature and the suppression of magnetic order, with notable differences between single and polycrystalline samples.

Contribution

It provides new insights into pressure-induced superconductivity in BaFe2As2 single crystals, highlighting the relationship between pressure, magnetic order suppression, and superconducting transition.

Findings

Superconductivity appears in single crystals under pressure with zero resistivity.

The superconducting transition temperature peaks around 1.5 GPa.

Magnetic order (SDW) is suppressed and vanishes above 1.5 GPa.

Abstract

The evolution of pressure induced superconductivity in single crystal as well as polycrystalline samples of BaFe2As2 has been investigated through temperature dependent electrical resistivity studies in 0-7 GPa pressure range. While the superconducting transition remains incomplete in polycrystalline sample, a clear pressure induced superconductivity with zero resistivity at the expense of magnetic transition, associated with spin density wave (SDW), is observed in the single crystal sample. The superconducting transition temperature (TC) is seen to increase upto a moderate pressure of about ~1.5 GPa and decreases monotonically beyond this pressure. The SDW transition temperature TSDW decreases rapidly with increasing pressure and vanishes above ~1.5 GPa.