The complex ac impedance of a type-II superconductor in the intermediate state has been measured between 3 and 40 MHz. The results are compared with a model of vortices acted on by a pinning force and the Lorentz force. Also, the inertial inductance of the superelectrons has been measured at 10 MHz and is shown to be sufficiently large, for thin films, to provide a convenient measure of the penetration depth.
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Possin et al. (1968) studied this question.
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