Collective excitations in the normal state of Cu-O-based superconductors
P. B. Littlewood, C. M. Varma, S. Schmitt-Rink, E. Abrahams
DOI 10.1103/PhysRevB.39.12371 · Physical Review B
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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 A1g 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.
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