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Bulk superconductivity and disorder in single crystals of LaFePO

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arxiv 0810.5368 v3 pith:WXMAYAI4 submitted 2008-10-30 cond-mat.supr-con cond-mat.str-el

Bulk superconductivity and disorder in single crystals of LaFePO

James G. Analytis , Jiun-Haw Chu , Ann S. Erickson , Chris Kucharczyk , Alessandro Serafin , Antony Carrington , Catherine Cox , Susan M. Kauzlarich
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Hakon Hope I. R. Fisher
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classification cond-mat.supr-con cond-mat.str-el
keywords lafeposuperconductingsuperconductivitybulkdisorderfindotherproperties
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We have studied the intrinsic normal and superconducting properties of the oxypnictide LaFePO. These samples exhibit bulk superconductivity and the evidence suggests that stoichiometric LaFePO is indeed superconducting, in contrast to other reports. We find that superconductivity is independent of the interplane residual resistivity $\rho_0$ and discuss the implications of this on the nature of the superconducting order parameter. Finally we find that, unlike $T_c$, other properties in single-crystal LaFePO including the resistivity and magnetoresistance, can be very sensitive to disorder.

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