Cuprate superconductivity interband model with a doping-formed spectrum

Abstract:

The basic properties of cuprate superconductivity are analysed by using a descriptive interband model with the two-component electron spectrum determined by doping. Pair-transfer and vibronic interactions couple the itinerant and “defect” bands. The vibronic renormalization of gaps causes important effects. Two normal-state pseudogaps appear at underdoping as recently observed [17, 18]. The pseudogap behaviour is extended beyond the underdoped region with the beginning of overlap of the band components. Various cuprate properties are analysed in a qualitative agreement with experiments.