Superconductivity in CeO1-xFxFeAs with upper critical field of 94 T

Prakash, J. ; Singh, S. J. ; Patnaik, S. ; Ganguli, A. K. (2009) Superconductivity in CeO1-xFxFeAs with upper critical field of 94 T Physica C: Superconductivity, 469 (2-3). pp. 82-85. ISSN 0921-4534

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.physc.2008.11.008

Abstract

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.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Oxypnictides; Superconductivity
ID Code:91644
Deposited On:23 May 2012 14:20
Last Modified:19 May 2016 05:22

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