Abstract
The temperature dependence of the normal-phase resistivityρ(T) ofYBa2Cu3Ox (YBCO)and La2 − xSrxCuO4 (LSCO) is analyzed by using the Boltzmann equation for holes in theτ-approximation, in which the dependence of the relaxation time on energy and temperatureτ(ε, T) is due to acoustic phonons. The temperature dependence of the chemical potentialμ(T) and effectivecarrier mass m* ∼ 10–100 free electron masses, obtained by fitting to the temperaturedependence of the Hall coefficient in terms of the negative-U centers model, areused to calculate ρ(T). The results obtained are compared with experimental data. It isshown that they are consistent over a wide range of doping levelsx and coincide inabsolute magnitude, ρ ∼ 10 − 4–10 − 3 Ω cm. In addition, the slope ratio of the dependence of the normal-phaseρ(T) on thesize of the x-ray coherent-scattering region and on the oxygen content is calculated for a set of epitaxialYBa2Cu3Ox films.
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