Charge-transfer excitations in the cuprate superconductors

Z. Dadachanji, R.W. Godby, P.B. Littlewood, R.J. Needs

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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.
Original languageEnglish
Pages (from-to)16204-16207
Number of pages3
JournalPhysical Review B
Issue number22
Publication statusPublished - 1 Dec 1995

Bibliographical note

© 1995 American Physical Society.

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