Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state
Abstract Under the influence of a constant drive the moving vortex state in 2H-NbS2 superconductor exhibits a negative differential resistance (NDR) transition from a steady flow to an immobile state. This state possesses a high depinning current threshold ( $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{...
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Nature Portfolio
2017
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oai:doaj.org-article:9d8a9bf7ea624bb3bd729d232e70997e2021-12-02T12:32:06ZNegative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state10.1038/s41598-017-05191-62045-2322https://doaj.org/article/9d8a9bf7ea624bb3bd729d232e70997e2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05191-6https://doaj.org/toc/2045-2322Abstract Under the influence of a constant drive the moving vortex state in 2H-NbS2 superconductor exhibits a negative differential resistance (NDR) transition from a steady flow to an immobile state. This state possesses a high depinning current threshold ( $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h ) with unconventional depinning characteristics. At currents well above $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h , the moving vortex state exhibits a multimodal velocity distribution which is characteristic of vortex flow instabilities in the NDR regime. However at lower currents which are just above $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h , the velocity distribution is non-Gaussian with a tail extending to significant negative velocity values. These unusual negative velocity events correspond to vortices drifting opposite to the driving force direction. We show that this distribution obeys the Gallavotti-Cohen Non-Equilibrium Fluctuation Relation (GC-NEFR). Just above $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h , we also find a high vortex density fluctuating driven state not obeying the conventional GC-NEFR. The GC-NEFR analysis provides a measure of an effective energy scale (E eff ) associated with the driven vortex state. The E eff corresponds to the average energy dissipated by the fluctuating vortex state above $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h . We propose the high E eff value corresponds to the onset of high energy dynamic instabilities in this driven vortex state just above $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h .Biplab BagGorky ShawS. S. BanerjeeSayantan MajumdarA. K. SoodA. K. GroverNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017) |
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Medicine R Science Q Biplab Bag Gorky Shaw S. S. Banerjee Sayantan Majumdar A. K. Sood A. K. Grover Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state |
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Abstract Under the influence of a constant drive the moving vortex state in 2H-NbS2 superconductor exhibits a negative differential resistance (NDR) transition from a steady flow to an immobile state. This state possesses a high depinning current threshold ( $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h ) with unconventional depinning characteristics. At currents well above $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h , the moving vortex state exhibits a multimodal velocity distribution which is characteristic of vortex flow instabilities in the NDR regime. However at lower currents which are just above $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h , the velocity distribution is non-Gaussian with a tail extending to significant negative velocity values. These unusual negative velocity events correspond to vortices drifting opposite to the driving force direction. We show that this distribution obeys the Gallavotti-Cohen Non-Equilibrium Fluctuation Relation (GC-NEFR). Just above $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h , we also find a high vortex density fluctuating driven state not obeying the conventional GC-NEFR. The GC-NEFR analysis provides a measure of an effective energy scale (E eff ) associated with the driven vortex state. The E eff corresponds to the average energy dissipated by the fluctuating vortex state above $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h . We propose the high E eff value corresponds to the onset of high energy dynamic instabilities in this driven vortex state just above $${{\boldsymbol{I}}}_{{\boldsymbol{c}}}^{{\boldsymbol{h}}}$$ I c h . |
format |
article |
author |
Biplab Bag Gorky Shaw S. S. Banerjee Sayantan Majumdar A. K. Sood A. K. Grover |
author_facet |
Biplab Bag Gorky Shaw S. S. Banerjee Sayantan Majumdar A. K. Sood A. K. Grover |
author_sort |
Biplab Bag |
title |
Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state |
title_short |
Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state |
title_full |
Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state |
title_fullStr |
Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state |
title_full_unstemmed |
Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state |
title_sort |
negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state |
publisher |
Nature Portfolio |
publishDate |
2017 |
url |
https://doaj.org/article/9d8a9bf7ea624bb3bd729d232e70997e |
work_keys_str_mv |
AT biplabbag negativevelocityfluctuationsandnonequilibriumfluctuationrelationforadrivenhighcriticalcurrentvortexstate AT gorkyshaw negativevelocityfluctuationsandnonequilibriumfluctuationrelationforadrivenhighcriticalcurrentvortexstate AT ssbanerjee negativevelocityfluctuationsandnonequilibriumfluctuationrelationforadrivenhighcriticalcurrentvortexstate AT sayantanmajumdar negativevelocityfluctuationsandnonequilibriumfluctuationrelationforadrivenhighcriticalcurrentvortexstate AT aksood negativevelocityfluctuationsandnonequilibriumfluctuationrelationforadrivenhighcriticalcurrentvortexstate AT akgrover negativevelocityfluctuationsandnonequilibriumfluctuationrelationforadrivenhighcriticalcurrentvortexstate |
_version_ |
1718394175015092224 |