22 citations · 92 across the 6 of their papers we have counts for
6 papers
Possible Pairing Symmetry of Superconductor Na_xCoO_2yH_2O
Yunori Nisikawa, Hiroaki Ikeda, Kosaku Yamada
To discuss a possibility that the superconductivities in Na_xCoO_2yH_2O are induced by the electron correlation, we investigate the possible pairing symmetry based on the single-ba…
A Mechanism of Spin-Triplet Superconductivity in Hubbard Model on Triangular La ttice: Application to UNi_2Al_3
Yunori Nisikawa, Kosaku Yamada
We discuss the possibility of spin-triplet superconductivity in a two-dimensional Hubbard model on a triangular lattice within the third-order perturbation theory. When we vary the…
Role of Vertex Correction and Dimensionality on Superconductivity Induced by On-site Coulomb Repuls ion
Hirono Fukazawa, Hiroaki Ikeda, Kosaku Yamada
We evaluate the dominant superconducting pairing symmetry in some 3-dimensional cubic lattice struct ures within the third-order perturbation theory with respect to the on-site cou…
Third Order Perturbation Analysis of Pairing Symmetry in Two-Dimensional Hubbard Model
Hirono Fukazawa, Kosaku Yamada
We study the superconducting instabilities of singlet and triplet pairing in a two-dimensional Hubbard model on the basis of the third-order perturbation theory (TOPT). We investig…
Perturbation Theory on the Superconductivity of Heavy Fermion Superconductors CeIr_{x}Co_{1-x}In_5
Yunori Nisikawa, Hiroaki Ikeda, Kosaku Yamada
We reformulate the Eliashberg's equation for the superconducting transition within the quasi-particle description, which takes account of the heavy electron mass. We discuss the su…
Perturbation Theory on the Superconductivity of Heavy Fermion Superconductor UPd_2Al_3
Yunori Nisikawa, Kosaku Yamada
We investigate the superconducting mechanism and the transition temperature of heav y fermion superconductor UPd_2Al_3 on the basis of a single band two-dimensional Hubbard model o…