Vortex correlations in the superconducting transition of YBa2(Cu1−xAlx)3O7−δ films in high magnetic fields
Dimitrios G. Xenikos, Jin-Tae Kim, Thomas R. Lemberger
DOI 10.1103/PhysRevB.48.7742 · Physical Review B
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Abstract
We determine the characteristic length scale for vortex correlations in YBa2(Cu1−xAlx)3O7−δ films [0≤x≤0.03] by studying their current-voltage characteristics in fields 0.5 T≤B≤6 T. We find that critical scaling persists over 60% of the resistive transition (which widens from 3 to 30 K as doping concentration and field increase) and breaks down when the correlation length is 500–1250 Å, a value that does not depend on the intervortex spacing. This result suggests that pinning in as-made films of YBa2Cu3O7−δ is dominated by extended rather than microscopic defects.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2(Cu1-xAlx)3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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