Abstract
The borocarbide YNi 2 B 2 C with quasi-2-dimensional structure encounters a superconducting transition at T c = 15.4 K, the pairing symmetry of which is not clarified; most of experiments suggest an extended s -wave state, while some claim a d -wave. In this paper, we investigate a possibility of a d -wave state, solving the Eliashberg equation within the third order perturbation theory for a repulsive Hubbard model with the band structure reproducing the main Fermi surface. It is shown that if the electron correlation gives the dominant contribution to the superconducting pairing interaction, the d x y -symmetry is the most favorable state corresponding to the (π, 0) peak structure of the spin susceptibility.
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