Abstract
The presence of lock-in oscillations in the magnetic hysteresis loops of YBa2Cu3O7−x (YBCO) single crystals, for applied fields parallel to the layered structure, is a unique tool in the study of intrinsic pinning. By using the lock-in oscillations we can obtain important conclusions on the role of the point disorder in the CuO2 planes. We gain a rare insight of how point disorder competes with the layered structure in pinning the vortices. We also present the first experimental results of the temperature dependence of the critical current in the quasi-2D regime, which clearly deviates from the existing theoretical predictions.
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