Scaling behavior of fluctuation conductivity of high-temperature superconductors in a magnetic field
D. H. Kim, K. E. Gray, M. D. Trochet
DOI 10.1103/PhysRevB.45.10801 · Physical Review B
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Abstract
Fluctuation conductivities of YBa2Cu3Ox and Tl2Ba2CaCu2Ox films have been analyzed beyond the Gaussian approximation by using the two- (2D) and three-dimensional (3D) scaling functions in the critical region. Near the mean-field transition temperature Tc(H), the fluctuation conductivity of YBa2Cu3Ox shows a 3D scaling behavior similar to that seen in the single crystal, suggesting that fluctuations are coherent over the adjacent Cu-O layers in this region. The fluctuation conductivity of Tl2Ba2CaCu2Ox shows good agreement with 2D scaling behavior for temperatures higher than a few degrees above Tc(H), but a deviation occurs very near and below Tc(H). The poor scaling in that region may be caused by double transitions, which are systematically seen in the highly anisotropic high-Tc superconductors like Tl2Ba2CaCu2Ox, preventing the determination of the validity of a 2D scaling formula near and below Tc(H).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88.6 | Pressure not reported | unknown |
| Tl2Ba2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 101 | Pressure not reported | unknown |
| Tl2Ba2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 102.5 | Pressure not reported | unknown |
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