Vortex pinning force in a superconducting niobium strip
George S. Park, Charles E. Cunningham, Blas Cabrera, Martin E. Huber
DOI 10.1103/PhysRevLett.68.1920 · Physical Review Letters
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Abstract
Using a SQUID-based technique, we measure the Lorentz force needed to depin a single trapped vortex in a superconducting Nb strip. The vortex is trapped by heating a portion of the strip above its critical temperature Tc with a laser pulse. Between 3.0 and 5.5 K, the pinning force obeys a power law fp=fp(0)(1-T/Tc)n, where fp(0)=(4.1±0.4)×10−4 N/m and n=1.9±0.1. We have determined at a confidence level of 99.2% that we trap single vortices, rather than multiple vortices or vortex-antivortex pairs.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.35 | Pressure not reported | unknown |
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