Driven Vortex States and Relaxation in Single Crystal $YBa_2Cu_4O_8$

B. Dabrowski; G. W. Crabtree; I. Aranson; K. Rogacki; S. Scheidl; U. Welp; V. Metlushko; V. M. Vinokur

arxiv: cond-mat/9804121 · v1 · pith:F2GKNPVD · submitted 1998-04-10 · cond-mat.supr-con

Driven Vortex States and Relaxation in Single Crystal YBa₂Cu₄O₈

V. Metlushko , U. Welp , I. Aranson , S. Scheidl , V. M. Vinokur , G. W. Crabtree , K. Rogacki , B. Dabrowski This is my paper

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classification cond-mat.supr-con

keywords vortexcurrentbeendrivenincreaseobservedrelaxationresponse

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The vortex response to various ac-drives has been studied in high quality $YBa_2Cu_4O_8$ single crystals. Well within the vortex solid phase a re-entrant resistive state has been observed that is characterized by long relaxation times. Pulse current response and IV characteristics reveal that in this state the driven vortex system relaxes in a way to increase t he effective pinning force. A phenomenological model accounts for the observed features, in particular the clock-wise hysteresis of the IV-curves and the increase of the apparent critical current with applied current amplitude.

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Driven Vortex States and Relaxation in Single Crystal YBa₂Cu₄O₈

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