Gorkov equations for a pseudogapped high-temperature superconductor

B. Giovannini and C. Berthod
Phys. Rev. B 63, 144516 – Published 21 March 2001
PDFExport Citation

Abstract

A phenomenological theory of superconductivity based on the two-body Cooperon propagator is presented. This theory takes the form of a modified Gorkov equation for the Green’s function and allows one to model the effect of local superconducting correlations and long-range phase fluctuations on the spectral properties of high-temperature superconductors, both above and below Tc. A model is proposed for the Cooperon propagator, which provides a simple physical picture of the pseudogap phenomenon, as well as insights into the doping dependence of the spectral properties. Numerical calculations of the density of states and spectral functions based on this model are also presented, and compared with the experimental tunneling (STM) and photoemission (ARPES) data. It is found, in particular, that the sharpness of the peaks in the density of states is related to the strength and the range of the superconducting correlations and that the apparent pseudogap in STM and ARPES can be different, although the underlying model is the same.

  • Received 3 August 2000

DOI:https://doi.org/10.1103/PhysRevB.63.144516

©2001 American Physical Society

Authors & Affiliations

B. Giovannini and C. Berthod

  • DPMC, Université de Genève, 24 Quai Ernest-Ansermet, 1211 Genève 4, Switzerland

References (Subscription Required)

Click to Expand
Issue

Vol. 63, Iss. 14 — 1 April 2001

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×