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Highly anisotropic gap function in borocarbide superconductor LuNi(2)B(2)C | | E Boaknin
; R W Hill
; C Proust
; C Lupien
; L Taillefer
; P C Canfield
; | | Date: |
3 Dec 2001 | | Journal: | Phys Rev Lett, 87 (23), 237001 | | Abstract: | The thermal conductivity of borocarbide superconductor LuNi(2)B(2)C 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 UPt(3), 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 LuNi(2)B(2)C, possibly with nodes. | | Source: | PubMed, pmid11736470 | | Services: | Forum | Review | Favorites | |
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