SQUID milliattovoltometry of YBa2Cu3O7−x thin films: Dissipation in low magnetic fields
F. C. Wellstood, M. J. Ferrari, J. J. Kingston, T. J. Shaw, John Clarke
DOI 10.1103/PhysRevLett.70.89 · Physical Review Letters
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Abstract
The observation of magnetic flux noise in superconducting thin-film flux transformers of YBa2Cu3O7−x enables us to measure a very small, frequency-dependent resistance Rv(f) in the films, caused by vortex motion. In static magnetic fields below 10−6 T and at voltages down to 10−20 V Hz−1/2,Rv is proportional to the frequency f at which the measurement is made, is approximately independent of temperature, and decreases with increasing static current in the transformer. This behavior cannot be explained by certain currently accepted models of dissipation arising from vortex motion, but is consistent with a model in which independent vortices hop between two potential wells in a confined region.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x 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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