An extended Hubbard model with inter-site attraction in two dimensions and high-Tcsuperconductivity
- 29 February 1988
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 21 (6) , L145-L151
- https://doi.org/10.1088/0022-3719/21/6/009
Abstract
The authors study a simple model for superconductivity based on an extended Hubbard model with on-site repulsive and inter-site attractive interaction for arbitrary electron density. The two-dimensional square lattice d-wave pairing is most stable for a nearly half-filled band. p-wave and then extended s-wave pairing become stable upon decreasing band filling. Competition between the various anisotropic pairings and antiferromagnetism as well as the effect of next-nearest-neighbour hopping is discussed. The authors relate the present model to high-Tc superconducting oxides.Keywords
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