High Pressure Effects on Superconductivity in the beta-pyrochlore Oxides AOs2O6 (A=K, Rb, Cs)

TL;DR

This study investigates how applying pressure affects the superconducting transition temperature (Tc) in beta-pyrochlore oxides AOs2O6 (A=K,Rb,Cs), revealing positive initial pressure effects and saturation in KOs2O6.

Contribution

It provides the first systematic pressure dependence measurements of Tc in AOs2O6 superconductors, highlighting differences among the compounds.

Findings

Initial pressure increases Tc in all compounds.

KOs2O6 shows saturation of Tc at 0.56 GPa.

Higher pressures cause a downturn in Tc for KOs2O6.

Abstract

Recently new pyrochlore oxides superconductors AOs2O6 (A=K,Rb,Cs) were found and we measured the pressure dependence of magnetization up to 1.2 GPa in order to deduce the pressure effect of Tc in the three beta-pyrochlore oxides. It is found that the initial pressure dependence of Tc is positive for all the compounds. Only KOs2O6 exhibits a saturation in Tc at 0.56 GPa and the downturn at higher pressure