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Phys Rev Lett. 2001 Jul 30;87(5):057002. Epub 2001 Jul 12.

Angular position of nodes in the superconducting gap of quasi-2D heavy-fermion superconductor CeCoIn5.

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Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.


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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