Experimental study of the inductance of pinned vortices in superconducting YBa2Cu3O7−δ films
Aaron A. Pesetski, Thomas R. Lemberger
DOI 10.1103/PhysRevB.62.11826 · Physical Review B
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Abstract
Using a two-coil mutual inductance method, we have measured the complex resistivity ρv(T,Be) of pinned vortices in c-axis pulsed laser deposited YBa2Cu3O7−δ films with magnetic fields applied perpendicular to the film. At low frequencies (<100 kHz) ρv is inductive and is inversely proportional to the Labusch parameter, the average vortex pinning force constant κexp. The observed weakening of κexp with increasing vortex density and temperature is consistent with a simple model based on extended pinning defects. We conclude that the effective radius of the defects is about 3–8 Å, and that, thermal supercurrent (phase) fluctuations have their full classical amplitude down to 5 K in the bandwidth set by the characteristic depinning frequency.
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. | 88.9 | Pressure not reported | onset |
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