Size effects on the quenching to the normal state of YBa2Cu3O7−δ thin-film superconductors
Mauricio Ruibal, Gonzalo Ferro, Manuel R. Osorio, Jesús Maza, José A. Veira, Félix Vidal
DOI 10.1103/PhysRevB.75.012504 · Physical Review B
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Abstract
To probe the quenching mechanisms under high current densities, current-voltage curves have been measured in YBa2Cu3O7−δ thin film microbridges with widths lower than the thermal diffusion length. This condition was obtained by using microbridge-widths under 100μm and stepped ramps of one millisecond step duration. Whereas the flux-flow resistivity is found to be microbridge-width independent, strong width dependence of the quenching current density is observed. These results provide a direct experimental demonstration that for high current densities varying in the millisecond range the transition to a highly dissipative state is due to self heating driven by “conventional” (nonsingular) flux flow effects.
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 | Pressure unresolved | unknown |
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