Anisotropic superconductivity in the Emery model

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Journal of Superconductivity

DOI:https://doi.org/10.1007/BF00727551· OSTI ID:458101

Mierzejewski, M ^[1]

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1. Univ. of Silesia, Katowice (Poland)

The author has 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 mixed s-wave + d-wave channel plays the dominating role, being replaced by pairing in the extended s-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 between s-wave and d-wave channels seems to be a general features of superconductivity in CuO{sub 2} planes.

• Sponsoring Organization: USDOE
• OSTI ID: 458101
• Journal Information: Journal of Superconductivity, Journal Name: Journal of Superconductivity Journal Issue: 3 Vol. 9; ISSN 0896-1107; ISSN JOUSEH
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
COPPER OXIDES
ELECTRON-HOLE COUPLING
HIGH-TC SUPERCONDUCTORS
SUPERCONDUCTIVITY