Excitonic Superconductivity in Copper Oxides.

摘要

We discuss the possibility of excitonic superconductivity in high T/sub c/ copper oxides. The Hamiltonians describing CuO sub 2 planes supports both antiferromagnetism and low-lying Cu O intra- and interband charge fluctuations. One crosses from one regime to another as the number of holes per unit cell increases. The high T/sub c/ superconductivity takes place at hole concentrations most favorable for intraband charge transfer excitations. The dynamic polarizability of the environment surrounding CuO sub 2 planes plays an important role in enhancing T/sub c/. 15 refs., 4 figs. (ERA citation 13:052789)