Physics – Condensed Matter – Superconductivity
Scientific paper
2005-08-25
Phys. Rev. B, 73, 014526 (2006)
Physics
Condensed Matter
Superconductivity
5 pages, 6 figures
Scientific paper
10.1103/PhysRevB.73.014526
We explore how the superconductivity arising from the on-site electron-electron repulsion will change when the repulsion is changed to a long-ranged, 1/r-like one by introducing an extended Hubbard model with the repulsion extending to distant (12th) neighbors. With a simplified fluctuation-exchange approximation, we have found for the square lattice that (i) as the band filling becomes dilute enough, the charge susceptibility becomes comparable with the spin susceptibility, where p and then s pairings become dominant, in agreement with the result for the electron gas by Takada, while (ii) the d-wave, which reflects the lattice structure, dominates well away from the half filling. All these can be understood in terms of the spin and charge structures along with the shape and size of the Fermi surface.
Aoki Hideo
Arita Ryotaro
Kuroki Kazuhiko
Onari Seiichiro
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