The oxide superconductors La_2-xSrₓCuO₄ and YBa₂Cu₃O6.5+y are treated as strongly correlated electron systems consisting of Cu ions with an on-site electron-electron interaction U of order 10 eV interacting via oxygen bands. Pairing occurs via scattering of quasiparticles into the two-particle resonance at energy U. The model is expressed in a slave-boson formalism and solved in mean field. The results explain the observed scaling of Tc with hole concentration and are consistent with other data.
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D. M. Newns (1987) studied this question.
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