The origin of pairing in high-Tc superconductors

Imbedded in the structural chemistry of the high-temperature cupric superconductors lies the new physics which can answer the unsolved fundamental problem of pairing. A mechanism is offered which uniquely shows how pairing can occur by virtue of intimate Cu III valence relationships that are generated in the mixed valence copper-oxygen planes. This mechanism leads to condensation to the lowest free energy superconducting state.