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See detailHigh temperature crossover in paraconductivity of granular Y1Ba2Cu3O7-y
Ausloos, Marcel ULg; Gillet, François ULg; Laurent, Christian et al

in Zeitschrift für Physik. B, Condensed Matter (1991), 84(1), 13-16

We have examined the deviation from linearity of the temperature dependence of the electrical resistivity of a YBaCuO ceramics. We have observed at high temperature a crossover behavior toward a ... [more ▼]

We have examined the deviation from linearity of the temperature dependence of the electrical resistivity of a YBaCuO ceramics. We have observed at high temperature a crossover behavior toward a logarithmic temperature dependence at lower temperature. It seems relevant to attribute the origin of such a term to a pair breaking mechanism contribution, thus to give a lower bound to the existence of superconductivity fluctuations onset temperature. Our findings also implies that carriers are bosons above T(c). [less ▲]

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See detailProbing conductivity fluctuations in high critical temperature superconductors
Ausloos, Marcel ULg; Clippe, Paulette ULg; Laurent, Christian

in Solid State Communications (1990), 73(2), 137-141

We comment and discuss published data on the electrical resistivity of high temperature superconductors in order to extract the dimensionality of superconductivity "critical" fluctuations. We present ... [more ▼]

We comment and discuss published data on the electrical resistivity of high temperature superconductors in order to extract the dimensionality of superconductivity "critical" fluctuations. We present arguments which indicate that observation of three temperature regimes is indeed possible: a scaling regime close to Tc and two regimes in the mean field region. In each regime, dominant scattering mechanisms can be different. [less ▲]

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See detailHomogeneous and fractal behavior of superconducting fluctuations in the electrical resistivity of granular ceramic superconductors
Ausloos, Marcel ULg; Clippe, Paulette ULg; Laurent, Christian

in Physical Review B (1990), 41(13), 9506-9509

Experimental data show that the electrical-resistivity temperature derivative diverges in a different manner in the granular ceramic superconductors YBa2Cu3O7-y and Bi1.75Pb0.25Ca2Sr2Cu3O10-y. Critical ... [more ▼]

Experimental data show that the electrical-resistivity temperature derivative diverges in a different manner in the granular ceramic superconductors YBa2Cu3O7-y and Bi1.75Pb0.25Ca2Sr2Cu3O10-y. Critical exponents are extracted and explained. The dimensionality of anomalous superconductivity fluctuations is deduced. A homogeneous case and a self-similar (fractal) behavior can occur and are found. They correspond to different values of the superconductivity s and some percolation p coherence-length ratio. The results indicate that superconductivity percolation is achieved through surface connection rather than through path connection. [less ▲]

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See detailSuperconductivity fluctuations in electrical and thermoelectrical properties of granular ceramic superconductors: Homogeneous versus fractal behavior
Clippe, Paulette ULg; Laurent, Christian; Patapis, S. K. et al

in Physical Review B (1990), 42(13), 8611-8614

Both the electrical-resistivity and the thermoelectric-power temperature-derivative diver- gences are examined in typical granular ceramic superconductors (YBa2Cu3O7-y and Bi1.75Pb0.25Ca2Sr2Cu3O10-z ... [more ▼]

Both the electrical-resistivity and the thermoelectric-power temperature-derivative diver- gences are examined in typical granular ceramic superconductors (YBa2Cu3O7-y and Bi1.75Pb0.25Ca2Sr2Cu3O10-z). Critical exponents are extracted in the region above the critical temperature. The dimensionality of anomalous superconductivity fluctuations is deduced. The same universal behavior is found for the excess resistivity and the excess thermoelectric power in a given system. It is shown that a homogeneous regime and a self-similar (fractal) behavior can be distinguished depending on the samples. The results are discussed in terms of superconductivity paths occurring through surface connections and of different values of the superconductivity S and percolation P coherence-length ratio. [less ▲]

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