Anisotropic superconductivity in the Emery model |
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| Authors: | M Mierzejewski |
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| Affiliation: | (1) Institute of Physics, University of Silesia, 40-007 Katowice, Poland;(2) DAAD Research Fellow at the Gerhard-Mercator University, Duisburg, Germany |
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| Abstract: | We have investigated anisotropic superconductivity originating from intersite pairing between holes in nearest and next nearest neighboring sites in the Emery model. Strong local Coulomb correlations among holes in copper orbitals have been taken into account within the Hubbard I approximation scheme. The superconducting transition temperature has been evaluated as a function of the hole concentration. It has been shown that with the onset of superconductivity, pairing among oxygen-like quasiparticles in the mixeds-wave+d-wave channel plays the dominating role, being replaced by pairing in the extendeds-wave channel for higher concentration of holes. Superconducting correlations are mostly effective for a rather narrow range of the model parameter values, close to values derived from band structure calculations. Therefore, the coupling betweens-wave andd-wave channels seems to be a general feature of superconductivity in CuO2 planes. |
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| Keywords: | Cu-O planes d-wave superconductor Hubbard Hamiltonian |
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