Abstract
We measured voltages across micro-bridges fabricated along the c-axis of La/sub 2-x/Sr/sub x/CuO/sub 4/ single crystals under an external magnetic field. A sharp voltage peak appears when the magnetic field was aligned to the ab plane within a few degrees. The vortex velocity estimated from the maximum voltage is much lower than the velocity that was measured in Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ single crystals. If many weak point-like pinning centers are assumed to be in the sample, the angular dependence of the voltage is explained by the collective flux creep model.
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