Faraday Induction and Flux Flow Voltages in Type II Superconductors: Effect of Magnetic Field and Temperature
We have recently reported1 that the integrated voltages S ∝ ∫ V(t) dt observed across an open single-layer superconducting coil, when a magnetic flux Δ∅ trapped in the body of the coil winding is expelled, are not uniquely described by the classical Faraday’s law ∫ V(t) dt ∝Δ∅. The integrated signal depends dramatically on the manner in which the superconducting state is thermally destroyed and the trapped flux expelled. Yet, following the assumption that the transit of vortices in the superconductor produces no observable voltage in the measuring circuit,2,3 we have explained1 all of our observations within the framework of classical Faraday induction. It was noted that the optimum limiting value of the integrated voltage S is observed in the case of infinitesimal amount of flux only. In this paper we report on the effect of temperature and applied static magnetic field on these measurements.
KeywordsApplied Magnetic Field Superconducting State Initial Magnetization Flux Gradient Infinitesimal Amount
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- 2.Y.B. Kim and M.J. Stephen, in Superconductivity, R.D. Parks, ed., Dekker, New York (1969), p. 1107.Google Scholar