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

Tuson Park·Elbert E. M. Chia·M. B. Salamon·E. D. Bauer·I. Vekhter·J. D. Thompson·Eun Mi Choi·Heon Jung Kim·Sung-Ik Lee·P. C. Canfield
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Abstract

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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Tuson Park, Elbert E. M. Chia, M. B. Salamon, E. D. Bauer, I. Vekhter, J. D. Thompson, Eun Mi Choi, Heon Jung Kim, Sung-Ik Lee, P. C. Canfield. 2004-06-11. Evidence for the Coexistence of Anisotropic Superconducting Gap and Nonlocal Effects in the Non-magnetic Superconductor LuNi2B2C. https://doi.org/10.1103/physrevlett.92.237002

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