Plasmon dispersion relations and the induced electron interaction in oxide superconductors: Numerical results

A. Griffin; A. J. Pindor

doi:10.1103/PhysRevB.39.11503

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Plasmon dispersion relations and the induced electron interaction in oxide superconductors: Numerical results

A. Griffin, A. J. Pindor

DOI 10.1103/PhysRevB.39.11503 · Physical Review B

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Abstract

Recently it is been argued that the plasmon modes expected in the oxide superconductors should be characteristic of a superlattice with a basis of several metallic sheets. We extend this work by including the exchange-correlation effects in a given CuO sheet via local-field corrections (the generalized random-phase approximation). In addition, the effective interaction between electrons in a given CuO sheet is worked out for a superlattice with a basis of several sheets, separating out the effects of the various kinds of plasmons. Numerical results are given for the superlattice plasmon dispersion relations for two and three sheets/unit cell. If the spacing of the sheets is small compared to the superlattice period (as it is in the 2:2:1:2 and 2:2:2:3 superconductors), we find that the low-frequency plasmon branches (n−1 of them, where n is the number of sheets/unit cell) are essentially identical to those of an isolated bilayer or trilayer.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2Can-1CunO4+2n Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2Can-1CunO4+2n Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown