Abstract
Measurements of the electrical resistance R of polycrystalline samples of Bi1.6Pb0.4Sr2Ca2Cu3OY with the 108-K superconducting phase show that the Aslamazov–Larkin (AL) two-dimensional paraconductivity corrections are observable in the vicinity of the mean-field theory transition temperatureT0C. The effective thickness, d≊23 Å, of the superconducting electronic sheet as found from the zero field data is comparable to the a,b-plane separation. This result agrees well with the recent single-crystal data. The data for magnetic fields up to 1.5 T also show paraconductivity effects. T0C (H) is found to decrease as a function of increasing magnetic field H; this result agrees with the prediction of the AL model.
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