Study of optical plasmons in La1.85Sr0.15Cu2O4

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Abstract

Reflectance and spectroellipsometric measurements were performed on a high-quality c-axis oriented La1.85Sr0.15CuO4 film to determine accurately the relevant spectral functions. The plasmon spectrum of La1.85CuO4 consists of an optic plasmon at about 0.8 eV and possibility a broad band of acoustic plasmons. The charactristic quadratic frequency dependence of the loss function, Im (−1/ge)=βω2 for ⩽ħω 〈 0.7 eV, has been observed. In view of similar behavior in YBa2Cu3O7, Bi2Sr 2CaCu2O8 and Tl2Ba2Ca2Cu3O10, this law seems to be universally obeyed in all high-Tc cuprate superconductors.

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