The current-voltage characteristics and transport critical currents at T=4.2 K and 77.3 K in Y 1 Ba 2 Cu 3 O 7-x bulk and thin film samples in magnetic fields up to 9 T have been measured. Large hysteresis of resistively measured critical currents was observed. This is caused by the magnetic field history as well as by the transport current history. An additional explanation of the observed hysteresis based on the different surface and volume pinning mechanisms is proposed.
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Majoroš et al. (1990) studied this question.
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