Superconductivity at 36 K in Gadolinium-arsenide Oxides GdO$_{1-x}$F$_{x}$FeAs

TL;DR

This study reports the synthesis of GdO$_{1-x}$F$_{x}$FeAs superconductors, achieving a transition temperature of approximately 36.6K at optimal fluorine doping, with observed resistivity anomalies and electron-like charge conduction.

Contribution

First demonstration of superconductivity in GdO$_{1-x}$F$_{x}$FeAs with detailed characterization of its properties and transition temperature.

Findings

Superconductivity at 36.6K in GdO$_{0.83}$F$_{0.17}$FeAs.

Resistivity anomaly near 130K similar to LaO$_{1-x}$F$_{x}$FeAs.

Electron-like charge carriers dominate conduction.

Abstract

In this paper we report the fabrication and superconducting properties of GdO$_{1-x}$F$_{x}$FeAs. It is found that when x is equal to 0.17, GdO$_{0.83}$F$_{0.17}$FeAs is a superconductor with the onset transition temperature T$_{c}^{on}\approx$ 36.6K. Resistivity anomaly near 130K was observed for all samples up to x = 0.17, such a phenomenon is similar to that of LaO$_{1-x}$F$_{x}$FeAs. Hall coefficient indicates that GdO$_{0.83}$F$_{0.17}$FeAs is conducted by electron-like charge carriers.