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The thermal conductivity of the heavy-fermion superconductor CeCoIn_5 hasbeen studied in a magnetic field rotating within the 2D planes. A clearfourfold symmetry of the thermal conductivity which is characteristic of asuperconducting gap with nodes along the (+-pi,+-pi)-directions is resolved.The thermal conductivity measurement also reveals a first order transition atH_c2, indicating a Pauli limited superconducting state. These results indicatethat the symmetry most likely belongs to d_{x^2-y^2}, implying that theanisotropic antiferromagnetic fluctuation is relevant to the superconductivity.Comment: 5 Pages, 4 figure

physical review letters

Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>CeCoIn</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion SuperconductorCeCoIn5