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