Physics – Condensed Matter – Superconductivity
Scientific paper
1998-01-12
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures included. Accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.57.7470
We study an extended Hubbard model with on-site repulsion and nearest neighbors attraction which tries to mimic some of the experimental features of doped cuprates in the superconducting state. We draw and discuss the phase diagram as a function of the effective interactions among electrons for a wide range of doping concentrations. We locate the region which is relevant for the cuprates setting some constraints on the parameters which may be used in this kind of effective models. We also study the effects of temperature and orthorrombicity on the symmetry and magnitude of the gap function, and map the model onto a simpler linearized hamiltonian, which produces similar phase diagrams.
Ferrer Jaime
Gonzalez-Alvarez M. A.
Sanchez-Cañizares J.
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