On the Flux Flow in the Resistive State of a Current-Carrying Superconductor in a Longitudinal Magnetic Field

A fluxoid motion in a resistive state of a current-carrying superconductor under a longitudinal magnetic field is investigated. A helical flux flow is considered to be induced by the driving torque due to the axial current above a critical value. This motion can be expected also from the Poynting vector measured on a specimen surface. The present helical flux flow model explains an appearance of the dynamic structure observed by Ezaki et al. with a longitudinal negative electric field under a constant longitudinal magnetization. This model is supported also by the experiment of Makiej et al. on a transverse electric field which indicates a motion of the longitudinal magnetic flux. And it is shown that the mean longitudinal electric field does not originate from penetration of the azimuthal magnetic field.

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