Driven Vortex States and Relaxation in Single Crystal $YBa_2Cu_4O_8$

Details Driven Vortex States and Relaxation in Single Crystal $YBa_2Cu_4O_8$ Driven Vortex States and Relaxation in Single Crystal $YBa_2Cu_4O_8$

1998-04-10

arxiv.org/abs/cond-mat/9804121v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, submitted to PRL

Scientific paper

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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