Superconducting transport properties of epitaxial YBa2Cu3O7−δ thin films: A consistent description based on thermally-activated flux motion
S. Zhu, D. K. Christen, C. E. Klabunde, J. R. Thompson, E. C. Jones, R. Feenstra, D. H. Lowndes, D. P. Norton
DOI 10.1103/PhysRevB.46.5576 · Physical Review B
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Abstract
The electrical-transport current properties of a series of epitaxial YBa2Cu3O7−δ thin films have been investigated using a range of techniques, including the activated electrical resistivity for fields B>Birr, the irreversibility field; the I-V curves for both B>Birr and B<Birr; and the resistive transitions in magnetic fields. The results are analyzed in the framework of a model for thermally-activated flux motion. The model utilizes a pinning barrier that is dependent on the current density J, temperature T, and applied magnetic field B, given by U0∝exp(-J/Jc0)(1-t)n/B, with n∼1.8. The exponential J dependence agrees well with the behavior U∝J−μ (μ∼0.8) of the collective-flux-creep model in the regime J<Jc0, while properly describing the finite pinning potential observed in the activated-flux-flow regime as J→0. The resulting analysis using this form for U0 provides a quantitatively self-consistent interpretation of all sets of measurements.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | zero_resistance |
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