High-Temperature Superconductivity in Eu0.5K0.5Fe2As2

TL;DR

This paper reports that 50% potassium doping in EuFe2As2 suppresses magnetic order and induces high-temperature superconductivity at 32 K, confirmed by multiple experimental techniques.

Contribution

It demonstrates that K-doping induces high-temperature superconductivity in EuFe2As2 by suppressing magnetic order, providing insights into doping effects in iron-based superconductors.

Findings

Superconductivity observed below 32 K

Suppression of SDW transition with K-doping

Bulk superconductivity confirmed by specific heat anomaly

Abstract

Subsequent to our recent report of SDW type transition at 190 K and antiferromagnetic order below 20 K in EuFe2As2, we have studied the effect of K-doping on the SDW transition at high temperature and AF order at low temperature. 50% K doping suppresses the SDW transition and in turn gives rise to high-temperature superconductivity below T_c = 32 K, as observed in the electrical resistivity, AC susceptibility as well as magnetization. A well defined anomaly in the specific heat provides additional evidence for bulk superconductivity.