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Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor CeCoIn_5

K. Izawa·H. Yamaguchi·Yuji Matsuda·H. Shishido·R. Settai·Y. Onuki
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Abstract

The thermal conductivity of the heavy-fermion superconductor CeCoIn_5 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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K. Izawa, H. Yamaguchi, Yuji Matsuda, H. Shishido, R. Settai, Y. Onuki. 2001-05-21. Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor CeCoIn_5. https://doi.org/10.1103/physrevlett.87.057002

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