Size limitation of vortex fluctuations in transport-current-carrying Bi2Sr2Ca2Cu3O10 high-temperature superconductors with preferential grain orientation
L. Miu
DOI 10.1103/PhysRevB.50.13849 · Physical Review B
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Abstract
The dissipation process in transport-current-carrying Bi2Sr2Ca2Cu3O10 samples with preferential grain orientation in zero applied magnetic field and close to the mean-field critical temperature Tc0 was investigated. The Tc0 value was obtained from an analysis of the fluctuation-induced excess dc conductivity in the framework of the Aslamazov-Larkin theory of paraconductibility. The measured transport critical-current density, which, at least at high temperatures, is essentially given by the contribution of good superconducting intergrain contacts in the sample, has a relatively large component decreasing linearly with temperature and vanishing clearly below Tc0. The temperature dependence of the transport critical current as well as the form of the current-voltage characteristics at low voltages can be understood by considering a current-dependent vortex-antivortex unbinding, size limited at the intergranular contacts, and by taking into account the contribution of entropy to the unbinding process.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 106.8 | Pressure not reported | midpoint |
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