Superconductivity in CeO_{1-x}F_xFeAs with upper critical field of 94 T

Details Superconductivity in CeO_{1-x}F_xFeAs with upper critical field of 94 T Superconductivity in CeO_{1-x}F_xFeAs with upper critical field of 94 T

2008-12-24

arxiv.org/abs/0812.4520v1

Physica C 469 (2009) 82--85

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1016/j.physc.2008.11.008

We have successfully synthesized Ce based oxypnictide with fluorine doping (CeO_{1-x}F_xFeAs) by a two step solid state reaction method. Detailed XRD and EDX confirm the crystal structure and chemical compositions. We observe that an extremely high Hc2(0) of 94 T can be achieved in the x = 0.1 composition. This increase in Hc2(0) is accompanied by a decrease in transition temperature (38.4 K in x = 0.1 composition) from 42.5 K for the x = 0.2 phase. The in-plane Ginzburg-Landau coherence length is estimated to be ~ 27 A at x = 0.2 suggesting a moderate anisotropy in this class of superconductors. The Seebeck coefficient confirms the majority carrier to be electrons and strong dominance of electron-electron correlations in this multiband superconductor.

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