Large decrease in the critical temperature of superconducting LaFeAsO0.85 compounds doped with 3% atomic weight of nonmagnetic Zn impurities

Guo, Y. F. and Shi, Y. G. and Yu, S. and Awana, V. P. S. (2010) Large decrease in the critical temperature of superconducting LaFeAsO0.85 compounds doped with 3% atomic weight of nonmagnetic Zn impurities. Physical Review B, 82 (5). 054506-1-054506-2. ISSN 1550-235X

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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.82.054506

Abstract

We observed a large decrease in Tc by no more than 3 at. % of Zn doped into the Tc-optimized superconductor LaFeAsO0.85 (Tc=26 K), confirmed by measurements of electrical resistivity, magnetic susceptibility, specific heat, Mössbauer spectroscopy, Hall coefficient, and an electron probe microanalysis. The rate ∼9 K/% is remarkably higher than others achieved by nonmagnetic impurities. The Tc suppression is likely due to pair breaking caused by scattering associated with the highly localized electronic state of Zn in the Fe2As2 layer. If this is true, the present result well accords with the theoretical prediction that suggests a sign reversal s-wave pairing model for the Fe-pnictide superconductors.

Item Type:	Article
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	18 May 2012 08:07
Last Modified:	18 May 2012 08:07
URI:	http://npl.csircentral.net/id/eprint/218

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