Collective excitations in the normal state of Cu-O-based superconductors

1 June 1989

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 39 (16), 12371-12374
https://doi.org/10.1103/physrevb.39.12371

Abstract

Standard weak-coupling methods are used to calculate the excitation spectrum and the instabilities of the metallic phase of a three-band model for the copper-oxide superconductors with both intra- and intersite repulsion. Besides the magnetic excitations, a strong charge-transfer resonance of

A_{1 g}

symmetry is predicted. For reasonable parameters, the metallic phase is found to be unstable to a charge-transfer instability at large deviations from half filling, and at small deviations to an antiferromagnet.

Keywords

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