Percolation models in granular high-Tc superconductors in the transition region
Kari Härkönen, Ilkka Tittonen, Jan Westerholm, Kari Ullakko
DOI 10.1103/PhysRevB.39.7251 · Physical Review B
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Abstract
We report on detailed simultaneous measurements of electrical resistivity and ac magnetic susceptibility of a carefully prepared granular YBa2Cu5O6.92 sample in the superconducting transition region. The observed features are explained in terms of a two-stage model. The first stage is attributed to the growing of superconducting inclusions. In the second stage of the transition we simulate both isotropic and anisotropic superconductivities by bond percolation models, where the conduction between nearest-neighbor grains is assumed to be correlated one or two dimensional or noncorrelated three dimensional. We observe no qualitative differences in the bulk matter between the superconductivities of different dimensionalities. Thus the general behavior of the bulk matter can be attributed to general properties of random media. The percolation models can be applied to all observed polycrystalline superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.92 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.3 | Pressure not reported | onset |
| YBa2Cu3O6.92 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.6 | Pressure not reported | onset |
| YBa2Cu3O6.92 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.3 | Pressure not reported | zero_resistance |
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