Basing on the time-dependent Ginzburg-Landau theory, we investigate the current-induced-transition state of type II superconductors in longitudinal magnetic field. A new mixed state in space-time domain is found, where the time integral of voltage difference is quantized in flux quantum. Experimentally observed transition properties in Pb films are explained with the help of the theoretical investigation. Interference patterns appeared in current-voltage curves give a conclusive evidence of the new mixed state in the transition state of superconductors.
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Masanori Sugahara (1975) studied this question.
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