Effects of the velocity on the reversible-irreversible transition in a periodically sheared vortex system

Abstract A reversible-irreversible transition (RIT) is studied using a periodically-driven vortex system in an amorphous film with random pinning that causes local shear, as a function of shear amplitude d . The relaxation time to reach the steady state exhibits a power-law divergence at a threshold...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 1975; no. 1; pp. 12002 - 12007
Main Authors Miyagawa, K, Maegochi, S, Ienaga, K, Kaneko, S, Okuma, S
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.07.2021
Subjects
Percolation
Phase transitions
Pinning
Relaxation time
Vortices
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Summary:Abstract A reversible-irreversible transition (RIT) is studied using a periodically-driven vortex system in an amorphous film with random pinning that causes local shear, as a function of shear amplitude d . The relaxation time to reach the steady state exhibits a power-law divergence at a threshold value d c with critical exponents in agreement with the values predicted for an absorbing phase transition in the two-dimensional (2D) directed-percolation (DP) universality class. In our previous work, the experiment was conducted at relatively high frequency f , giving rise to a large mean vortex velocity v . Here we use lower f to study the effects of reduced v and increased dynamic pinning on the RIT. The results show that the critical behavior of RIT stays essentially unchanged, while we find a trend for d c to increase with decreasing v . We will propose a possible model to qualitatively explain this unexpected result.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1975/1/012002