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Superconductivity in the Penson-Kolb Model on a Triangular Lattice
Acta Physica Polonica. A
We investigate properties of the two-dimensional Penson-Kolb model with repulsive pair hopping interaction. In the case of a bipartite square lattice this interaction may lead to the η-type pairing, when the phase of superconducting order parameter changes from one lattice site to the neighboring one. We show that this interaction may be responsible for the onset of superconductivity also for a triangular lattice. We discuss the spatial dependence of the superconducting order parameter anddoi:10.12693/aphyspola.114.209 fatcat:fwnat632mbh6rnhfpm45oh7wne