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26 April 2024 |
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Highly Anisotropic Gap Function in Borocarbide Superconductor LuNi_2B_2C | | Etienne Boaknin
; R.W. Hill
; Cyril Proust
; C. Lupien
; Louis Taillefer
; P. C. Canfield
; | | Date: |
25 Aug 2001 | | Journal: | Phys. Rev. Lett. 87, 237001 (2001) | | Subject: | Superconductivity | cond-mat.supr-con | | Affiliation: | Canadian Institute for Advanced Research and U. of Toronto), P. C. Canfield (Ames Laboratory and Department of Physics and Astronomy, Iowa State University | | Abstract: | The thermal conductivity of borocarbide superconductor LuNi_2B_2C 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_2B_2C, possibly with nodes. | | Source: | arXiv, cond-mat/0108409 | | Services: | Forum | Review | PDF | Favorites | |
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