Abstract
Precise measurements of the electrical resitivity of Y1Ba2Cu3O7−y have been taken in the temperature range between the “percolation transition” temperatureT R and the “superconducting onset” temperatureT0 in presence of low magnetic fields (0–4 kG). Data analysis shows markedly different resistivity regimes from which superconductivity characteristic temperature ranges are defined. Exponential, linear, exponential, power law, and linear regimes are successively seen starting from low temperature. They are explained in terms of dimensionality effects inherent to the anisotropic microcrystalline structures. Experimental laws for the temperature and the field dependence are given, e.g. δT∼-B0.3 between the applied field and the temperature shift of the knee onR(T).
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