Little-Parks oscillations of Tc in patterned microstructures of the oxide superconductor YBa2Cu3O7: Experimental limits on fractional-statistics-particle theories
P. L. Gammel, P. A. Polakos, C. E. Rice, L. R. Harriott, D. J. Bishop
DOI 10.1103/PhysRevB.41.2593 · Physical Review B
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Abstract
We report observation of Little-Parks oscillations in arrays with a 4-μm2 plaquette area, fabricated from c^-axis-oriented YBa2Cu3O7 films. Near the mean-field transition temperature the magnitude of the oscillations implies a zero-temperature coherence length ξ(0)=15±2 Å. For temperatures more than 1 K below the mean-field transition, the magnitude of the oscillations increases dramatically, apparently signaling a crossover to the dynamics of a Josephson-coupled network. Precise experimental limits can be placed on the value of the flux quantum, severely restricting any anomalous value which may be proposed on the basis of fractional-statistics-particle theories.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | zero_resistance |
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