Abstract
The oxide superconductors La/sub 2-//sub x/Sr/sub x/CuO/sub 4/ and YBa/sub 2/Cu/sub 3/O/sub 6.5+//sub 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 T/sub c/ with hole concentration and is consistent with other data.
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