Superconductivity at 11.3 K induced by cobalt doping in CeOFeAs

Details Superconductivity at 11.3 K induced by cobalt doping in CeOFeAs Superconductivity at 11.3 K induced by cobalt doping in CeOFeAs

2008-10-08

arxiv.org/abs/0810.1364v1

Solid State Communications 149 (2009) 181-183

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1016/j.ssc.2008.11.028

Pure phases of a new oxyarsenide superconductor of the nominal composition CeOFe0.9Co0.1As was successfully synthesized by solid state reaction in sealed silica ampoules at 1180 C. It crystallizes in the layered tetragonal ZrCuSiAs type structure (sp gp P4/nmm) with lattice parameter of a = 3.9918(5) angstrom and c = 8.603(1) angstrom. A sharp superconducting transition is observed at 11.31 K with an upper critical field of 45.22 T at ambient pressure. The superconducting transition temperature is drastically lowered (~ 4.5, 4.9 K) on increasing the concentration (x = 0.15, 0.2) of cobalt.

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