Lorentz-force independence of resistance tails for high-temperature superconductors in magnetic fields near Tc
K. C. Woo, K. E. Gray, R. T. Kampwirth, J. H. Kang, S. J. Stein, R. East, D. M. McKay
DOI 10.1103/PhysRevLett.63.1877 · Physical Review Letters
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Abstract
An unusual loss mechanism has been commonly observed in the high-temperature superconductors in a magnetic field near the zero-field transition temperature Tc. The resistive transitions associated with this loss in highly c-axis-oriented Tl2Ba2CaCu2Ox thin films are presented as a function of field perpendicular to the c axis, for the current both perpendicular and parallel to the field. The data for these orientations are essentially the same over a span of 5 orders of magnitude below the normal-state resistance. Since the macroscopic Lorentz force is zero for the current parallel to the magnetic field, it can play, at most, a significantly reduced role in this loss mechanism, and our results seriously question any explanation of these losses based on magnetic flux motion.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 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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