19780123
We give an explicit solution for the mean velocity of a Brownian particle that is subject simultaneously to a spatially sinusoidal and a constant force. An application is made to the superconducting surface sheath of lead, wherein the fluxoids are represented by Brownian particles. When Brownian mean velocity curves are fitted to experimental voltage-current curves, we find that the parameter values are physically reasonable provided that interactions among the fluxoids are taken into account. The fluxoids move, in effect, as collections of about 100 fluxoids.
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Mayo, R.E., Baierlein, R. & Trefny, J. Brownian motion and the superconducting surface sheath. J Low Temp Phys 33, 377–391 (1978). https://doi.org/10.1007/BF00115007
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DOI: https://doi.org/10.1007/BF00115007