A Physical Model For High Tc Superconductivity Of The Oxygen Deficient Perovskite Y-Ba-Cu-O

The high Tc superconductivity of the oxygen deficient perovskite Y1Ba2Cu3O7 has closed relation to the ordering distribution of the cations with various valences and the oxygen vacancies in this structure. The special electronic structure related to such ordering distribution lead to the phonon softening and the excitonic mechanism for superconducting pairing. These effects provide a physical model to understand the high Tc superconductivity in this material.