Homogeneous and fractal behavior of superconducting fluctuations in the electrical resistivity of granular ceramic superconductors

M. Ausloos; P. Clippe; Ch. Laurent

doi:10.1103/PhysRevB.41.9506

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Homogeneous and fractal behavior of superconducting fluctuations in the electrical resistivity of granular ceramic superconductors

M. Ausloos, P. Clippe, Ch. Laurent

DOI 10.1103/PhysRevB.41.9506 · Physical Review B

T1

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Abstract

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 ξs and some percolation ξp coherence-length ratio. The results indicate that superconductivity percolation is achieved through surface connection rather than through path connection.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi1.75Pb0.25Ca2Sr2Cu3O10-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown