Persistence of pinning and creep beyond critical drive within the strong pinning paradigm

Pinning and thermal creep determine the response of numerous systems containing superstructures, e.g., vortices in type II superconductors, domain walls in ferroics, or dislocations in metals. The combination of drive and thermal fluctuations leads to the superstructure's depinning, and its vel...

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Bibliographic Details
Published in:Physical review. B 2018-09, Vol.98 (9), p.094510, Article 094510
Main Authors: Buchacek, M., Willa, R., Geshkenbein, V. B., Blatter, G.
Format: Article
Language:English
Subjects:
Creep (materials)
Dislocations
Domain walls
Dry friction
Mechanical analysis
Pinning
Superstructures
Variations
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Summary:Pinning and thermal creep determine the response of numerous systems containing superstructures, e.g., vortices in type II superconductors, domain walls in ferroics, or dislocations in metals. The combination of drive and thermal fluctuations leads to the superstructure's depinning, and its velocity v determines the electric, magnetic, or mechanical response. It is commonly believed that pinning and creep collapse above the critical drive Fc, entailing a sharp rise in the velocity v. We challenge this perception by studying the effects of thermal fluctuations within the framework of strong vortex pinning in type II superconductors. In fact, we show that pinning and thermal creep persist far beyond the critical force. The resulting force-velocity characteristic largely maintains its zero-temperature shape, and thermal creep manifests itself by a downward renormalization of the critical drive. Such characteristics are in agreement with Coulomb's law of dry friction, and they have been often observed in experiments.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.094510