Pairing mechanisms in high-Tc superconductors
C. A. Balseiro, A. G. Rojo, E. R. Gagliano, B. Alascio
DOI 10.1103/PhysRevB.38.9315 · Physical Review B
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Abstract
We study the electronic structure of Cu-O high-Tc superconductors using a tight-binding Hamiltonian with strong intra-atomic and interatomic Coulomb repulsion. We assume that only Cu(3dx2−y2) and O(2px) and O(2py) orbitals are relevant. We solve finite clusters exactly and use a cell approximation to show that the basic assumptions together with quasidegeneracy of p and d energies leads to attractive interactions between holes in the ceramic superconductors.
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