Abstract
We report the optical conductivity of YBa 2Cu 3O 7 and Bi 2Sr 2CaCu 2O 8+δ thin films at room temperature. The optical conductivity in the 500–7000 cm −1 frequency range is analysed in terms of a frequency dependent relaxation time τ and effective mass of the normal carriers. The relaxation rate 1/τ exhibits the same linear dependence on frequency whatever the sample. The assumption that 1/τ also depends linearly on temperature accounts satisfactorily for the temperature variation (90–300K) of the transmission in the 1000–7000 cm −1 range. These results are consistent with the marginal Fermi liquid model.
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