Theory for superconducting properties of the cuprates: doping dependence of the electronic excitations and shadow states
Institut für Theoretische Physik, Freie Universität Berlin,
Arnimallee 14, 14195 Berlin, Germany
Accepted: 7 March 1996
The superconducting phase of the 2D one-band Hubbard model is studied within the FLEX approximation and by using an Eliashberg theory. We investigate the doping dependence of Tc, of the gap function and of the effective pairing interaction. Thus we find that Tc becomes maximal for doping. In overdoped systems Tc decreases due to the weakening of the antiferromagnetic correlations, while in the underdoped systems due to the decreasing quasi-particle lifetimes. Furthermore, we find shadow states below Tc which affect the electronic excitation spectrum and lead to fine structure in photoemission experiments.
PACS: 74.20.Mn – Microscopic theory of high-Tc superconductivity; insulator-superconductor transitions / 74.72.-h – High-Tc cuprates / 74.25.Jb – Electronic structure
© EDP Sciences, 1996