Superconductivity at 53.5 K in GdFeAsO1-delta

TL;DR

This paper reports the synthesis of GdFeAsO1-delta with oxygen deficiency, exhibiting superconductivity at 53.5 K, expanding the family of high-temperature iron-based superconductors.

Contribution

It introduces a new Gd-based iron-arsenic oxide superconductor with a high transition temperature and details its structural and superconducting properties.

Findings

Superconductivity at 53.5 K in GdFeAsO1-delta

Same crystal structure as other ReFeAsO1-delta compounds

Reduced lattice parameters compared to SmFeAsO1-delta

Abstract

Here we report the fabrication and superconductivity of the iron-based arsenic-oxide GdFeAsO1-delta compound with oxygen-deficiency, which has an onset resistivity transition temperature at 53.5 K. This material has a same crystal structure as the newly discovered high-Tc ReFeAsO1-delta family (Re = rare earth metal) and a further reduced crystal lattice, while the Tc starts to decrease compared with the SmFeAsO1-delta system.