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The European Physical Journal B

Anisotropic pairing with repulsive interactions in a model with different orbitals per site

F. Guinea

Published Dec 1, 2003• 1 citation
Publisher
DOI
10.1140/epjb/e2004-00007-3

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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-T c superconducting oxides.