Highly anisotropic gap function in borocarbide superconductor LuNi2B2C
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2001-12-03
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American Physical Society
Abstract
The thermal conductivity of borocarbide superconductor LuNi2B2C was measured down to 70 mK (T-c/200) in a magnetic field perpendicular to the heat current from H = 0 to above H-c2 = 7 T. As soon as vortices enter the sample, the conduction at T --> 0 grows rapidly, showing unambiguously that delocalized quasiparticles are present at the lowest energies. The field dependence is very similar to that Of UPt3, a heavy-fermion superconductor with a line of nodes in the gap, and very different from the exponential dependence characteristic of s-wave superconductors. This is strong evidence for a highly anisotropic gap function in LuNi2B2C, possibly with nodes.
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This article is published as Boaknin, Etienne, R. W. Hill, Cyril Proust, C. Lupien, Louis Taillefer, and P. C. Canfield. "Highly anisotropic gap function in borocarbide superconductor LuNi 2 B 2 C." Physical Review Letters 87, no. 23 (2001): 237001.
DOI: 10.1103/PhysRevLett.87.237001.
Copyright 2001 American Physical Society.
Posted with permission.