Infrared absorption and the loss function of the high-Tc superconductors

S. M. Bose; P. Longe

doi:10.1103/PhysRevB.48.6632

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Infrared absorption and the loss function of the high-Tc superconductors

S. M. Bose, P. Longe

DOI 10.1103/PhysRevB.48.6632 · Physical Review B

T1

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Abstract

The loss-function tensor associated with the infrared absorption spectra of the high-Tc superconductors has been calculated. The model used is a system of layered two-dimensional electron gases where the charge carriers interact via an effective potential mediated by intra- and interlayer exchange of acoustic and optical plasmons. The calculations are applied to La1.85Sr0.15CuO4 where the loss function has recently been obtained from careful measurements of the infrared absorption spectra. The shape of the calculated loss function is in good agreement with the experimental curve. The observed peak occurring at a frequency about 1.5 times the optical plasmon frequency is shown to correspond to the excitation of a plasmon coupled with electron-hole pairs. This theory also allows for establishment of relations between various physical parameters.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown