Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor CeCoIn₅

2001/04/30 by K. Izawa, H. Yamaguchi, Yuji Matsuda +3 · 1 citation
Physics and Astronomy · #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.87.057002

published as Phys. Rev. Lett. 87, 057002 (2001). · 5 Pages, 4 figures

arxiv created 2001/05/21 · arxiv updated 2009/11/30

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_x²-y², implying that the anisotropic antiferromagnetic fluctuation is relevant to the superconductivity.

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