title: Angular position of nodes in the superconducting gap of quasi-2D heavy-fermion superconductor CeCoIn5.
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.
authors.affiliation: Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Izawa
authors.forename: H
authors.initials: H
authors.lastname: Yamaguchi
authors.forename: Y
authors.initials: Y
authors.lastname: Matsuda
authors.forename: H
authors.initials: H
authors.lastname: Shishido
authors.forename: R
authors.initials: R
authors.lastname: Settai
authors.forename: Y
authors.initials: Y
authors.lastname: Onuki