Date: 17 May 2008

Superconductivity at 36 K in gadolinium-arsenide oxides GdO1−x F x FeAs

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In this paper we report the fabrication and superconducting properties of GdO1−x F x FeAs. It was found that when x is equal to 0.17, GdO0.83F0.17FeAs is a superconductor with the onset transition temperature T c on ≈ 36.6 K. Resistivity anomaly near 130 K was observed for all samples up to x = 0.17, and such a phenomenon is similar to that of LaO1−x F x FeAs. Hall coefficient indicates that GdO1−x F x FeAs is conducted by electron-like charge carriers.

Recommended by Prof. Nie Yuxin, Executive Editor of Science in China Series G-Physics, Mechanics & Astronomy
Supported by the National Natural Science Foundation of China (Grant Nos. 10221002/A0402 and 10774170/A0402), the National Basic Research Program of China (973 Program) (Grant Nos. 2006CB601000, 2006CB921107 and 2006CB921802), and the Chinese Academy of Sciences (ITSNEM)