Angular position of nodes in the superconducting gap of quasi-2D heavy-fermion superconductor CeCoIn5 |
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Authors: | Izawa K Yamaguchi H Matsuda Y Shishido H Settai R Onuki Y |
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Affiliation: | Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan. |
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Abstract: | The thermal conductivity of the heavy-fermion superconductor CeCoIn5 has been studied in a magnetic field rotating within the 2D planes. A clear fourfold symmetry of the thermal conductivity which is characteristic of a superconducting gap with nodes along the ( +/- pi,+/- pi) directions is resolved. The thermal conductivity measurement also reveals a first-order transition at H(c2), indicating a Pauli limited superconducting state. These results indicate that the symmetry most likely belongs to d(x(2)-y(2)), implying that the anisotropic antiferromagnetic fluctuation is relevant to the superconductivity. |
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