Electronic structure and excitonic-enhanced superconducting mechanism in YBa2Cu3O7−δ

Abstract

On the basis of the calculated electronic structure, an excitonic-enhanced superconducting mechanism is used to explain the high $T_c$ superconductivity in ${\mathrm{YBa}}_2$ ${\mathrm{Cu}}_3$ ${\mathrm{O}}_{7\mathrm{-}\mathrm{\delta }}$ system.