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Simple Demonstration of Voltages Generated by Vortex Motion in Type‐II Superconductors
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8.In our experiment the Lorentz driving force (or magnetic pressure, in this case) in the dominating force and the vortices move against the heat flow. In the experiments reported in Ref. 6, the thermal gradient dominates and causes the vortices to move with the heat flow.
9.J. M. Rayroux, D. Itschner, and P. Müller [Phys. Letters 24A, 351 (1967)] observe a voltage across a noninductive, bifilarly wound, superconducting sample carrying a steady current when an applied magnetic field is varied at constant temperature.
9.W. F. Druyvesteyn [Phys. Letters 25A, 31 (1967) has analyzed their results. The viewpoint we develop follows his interpretation. In the work of Rayroux et al., the vortices move down the field gradient when it becomes supercritical as the external field is varied. The field profiles are asymmetric because a conduction current is present, hence the flux flow is also “asymmetric” and a net voltage appears. The noninductive bifilar construction of the sample leads to cancellation of the Faraday voltages.
9.The model outlined here also accounts for the transient voltages observed by M. A. R. LeBlanc and F. L. Vernon, Jr., Phys. Letters 13, 291 (1964) during noncatastrophic flux jumps.
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