The optical reflectivity spectra of new superconductors (La1-x M x )2CuO4 (M=Ba, Ca, Sr) were investigated. In the spectra for the metallic samples, a plasma edge was observed at almost the same position for all compositions x and for all substituents. Based on the two-dimensional tight-binding model, the conduction band width was estimated to be about 1 eV from the value of the observed plasma energy.
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Tajima et al. (1987) studied this question.
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