Eur. Phys. J. B 30, 495-500 (2002)
https://doi.org/10.1140/epjb/e2002-00406-4

Cuprate superconductivity interband model with a doping-formed spectrum

Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia

Corresponding author: ^a kolja@fi.tartu.ee

Received: 1 April 2002
Revised: 1 October 2002
Published online: 31 December 2002

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.