Abstract
First-principles calculations of the dielectric matrix of the key structural element of the copper-oxide super-conductors show a weakly damped resonance at 3.5 eV which contains most of the oscillator strength in charge-transfer excitations. Such excitations have been proposed as a mediating boson for superconductive pairing. Although this mode is a well-developed and robust excitation, we find its energy to be too large to give high superconducting transition temperatures.
- Received 17 August 1995
DOI:https://doi.org/10.1103/PhysRevB.52.16204
©1995 American Physical Society