Vortex pinning by competing disorder: bose-glass to vortex-glass crossover

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Description/Abstract

Magnetization measurements have been used to study the Bose-glass to vortex-glass crossover in YBa2Cu3O7-x crystals by varying the angle theta between the field and the twin planes. Two critical angles theta L and theta K are found: For theta < theta L, vortices lock in to the twin planes; for theta L< theta < theta K, a kinked vortex structure occurs; for theta > theta K, hysteresis loops reproduce the magnetic response of the untwinned regions where pinning is produced by random point defects. The angles theta K and theta L depend only on the disorder in the untwinned regions and scale with [ Delta M( theta K)]-0.5, where Delta M( theta K) is the hysteresis width for theta > theta K.