Lorentz-force independence of resistance tails in magnetic fields near Tc for the low-temperature superconductor granular NbN: A Josephson-junction model
D. H. Kim, K. E. Gray, R. T. Kampwirth, K. C. Woo, D. M. McKay, J. Stein
DOI 10.1103/PhysRevB.41.11642 · Physical Review B
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Abstract
The broadened resistive transitions in a granular NbN film have been measured for field orientations both perpendicular and parallel to the current. These are essentially the same over a span of six orders of magnitude below the normal-state resistance (just above Tc) demonstrating the absence of the macroscopic Lorentz force. We show that a model of Josephson coupling between grains, rather than flux motion, can quantitatively explain the results with no adjustable parameters. Broadening of the resistive transitions of high-temperature superconductors (HTS) has also been shown to be independent of the macroscopic Lorentz force. This research demonstrates unambiguously that resistive losses near Tc and the absence of the macroscopic Lorentz force on them are not restricted to exotic HTS.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.7 | 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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