We have successfully synthesized Ce based oxypnictide superconductors with fluorine doping (CeO1-xFxFeAs) 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 Å 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. © 2008 Elsevier B.V. All rights reserved.

Jai Prakash

Department of Chemistry

S.J. Singh

S. Patnaik

A.K. Ganguli

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Journal	Physica C: Superconductivity and its Applications
ISSN	09214534