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Evidence for the Coexistence of Anisotropic Superconducting Gap and Nonlocal Effects in the Non-magnetic Superconductor LuNi2B2C

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arxiv cond-mat/0310663 v2 pith:TNCDH6VY submitted 2003-10-28 cond-mat.supr-con cond-mat.str-el

Tuson Park , Elbert E. M. Chia , M. B. Salamon , E. D. Bauer , I. Vekhter , J. D. Thompson , Eun Mi Choi , Heon Jung Kim
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Sung-Ik Lee P. C. Canfield
This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords alphaanomalousalongeffectsfieldluni2b2cminimapattern
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A study of the dependence of the heat capacity Cp(alpha) on field angle in LuNi2B2C reveals an anomalous disorder effect. For pure samples, Cp(alpha) exhibits a fourfold variation as the field H < Hc2 is rotated in the [001] plane, with minima along <100> (alpha = 0). A slightly disordered sample, however, develops anomalous secondary minima along <110> for H > 1 T, leading to an 8-fold pattern. The anomalous pattern is discussed in terms of coexisting superconducting gap anisotropy and non-local effects.

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