Theory on Superconductivity of CeIn₃ in Heavy Fermion System

抄録

On the basis of a three-dimensional Hubbard model, the superconducting mechanism of CeIn₃ under high pressure is investigated by the third-order perturbation theory with respect to the on-site Coulomb interaction U. Here we propose the d-wave pairing state induced by antiferromagnetic spin fluctuations. The estimated superconducting transition temperature is lower by one order than that in the two-dimensional system for the same value of U⁄W (W = bandwidth). This result is consistent with the difference between CeIn₃ and CeRhIn₅.