Abstract
Resistivity, thermoelectric power (S) and critical current measurements on bulk samples of superconducting (Bi 0.8Pb 0.2) 2Sr 2Ca 3(Cu 1−xAg x) 4O 12−x for different x values at small concentrations (0≤×≤0.02) have been carried out in the temperature range 77K–300K. The Seebeck coefficient exhibits an enhancement above the critical temperature that increases with x. The resistivity correlates very well with the highest value of S for each sample. Although the results for S follow the universal trends found in previous works, there are some peculiarities in our data for this compound. We try to explain the S results in terms of rather conventional models. It is argued that in the copper oxides the e-p effects, usually negligible in normal metals at temperatures small compared to the Debye temperature, are significant near and above the critical temperature. A small contribution due to the phonon-drag effect is also discussed.
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