Superconductivity fluctuations in electrical and thermoelectrical properties of granular ceramic superconductors: Homogeneous versus fractal behavior
P. Clippe, Ch. Laurent, S. K. Patapis, M. Ausloos
DOI 10.1103/PhysRevB.42.8611 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
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 ξS and percolation ξP coherence-length ratio.
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. | 91 | Pressure not reported | onset |
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | onset |
| Bi1.75Pb0.25Ca2Sr2Cu3O10-z Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | onset |
| Bi1.75Pb0.25Ca2Sr2Cu3O10-z Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | onset |
Similar papers
Homogeneous and fractal behavior of superconducting fluctuations in the electrical resistivity of granular ceramic superconductors
similarity 0.98M. Ausloos et al.
Source status unknown — claims are unverified
Synthesis and characterization of YBa2(Cu1−xMx)3O7−δ (M=Co,Ni): Crystal symmetry, superconductivity, and the role of oxygen
similarity 0.96J. F. Bringley et al.
Source status unknown — claims are unverified
Possible structural phase transition near 210 K of single-phase Bi(Pb)-Sr-Ca-Cu-O superconducting ceramics
similarity 0.96He Yusheng et al.
Source status unknown — claims are unverified
Structural and superconducting properties of R1−xCaxBa2Cu3O7−δ with 0.50>~x>~0.00
similarity 0.96A. Sedky et al.
Source status unknown — claims are unverified
Nonmonotonic temperature dependence of the experimentally determined vortex-creep activation energy in disordered high-temperature superconductors
similarity 0.96L. Miu et al.
Source status unknown — claims are unverified
Fluctuation-enhanced conductivity in the Sb-doped Bi-Pb-Sr-Ca-Cu-O superconducting system
similarity 0.96R. K. Nkum & W. R. Datars
Source status unknown — claims are unverified