Zero-field superconducting phase transition obscured by finite-size effects in thick YBa2Cu3O7−δ films
M. C. Sullivan, D. R. Strachan, T. Frederiksen, R. A. Ott, M. Lilly, C. J. Lobb
DOI 10.1103/PhysRevB.69.214524 · Physical Review B
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Abstract
We report on the normal-superconducting phase transition in thick YBa2Cu3O7−δ films in zero magnetic field. We find significant finite-size effects at low currents even in our thickest films (d=3200Å). Using data at higher currents, we can unambiguously find Tc and z, and show z=2.1±0.15, as expected for the three-dimensional XY model with diffusive dynamics. The crossover to two-dimensional behavior, seen by other researchers in thinner films (d⩽500Å), obscures the three-dimensional transition in both zero field and the vortex-glass transition in field, leading to incorrect values of Tc (or Tg), ν, and z. The finite-size effects, usually ignored in thick films, are an explanation for the wide range of critical exponents found in the literature.
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. | 91.5 | Pressure not reported | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.44 | Pressure not reported | midpoint |
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