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}}}^{...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Biplab Bag, Gorky Shaw, S. S. Banerjee, Sayantan Majumdar, A. K. Sood, A. K. Grover
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2017
Materias:
R
Q
Acceso en línea:https://doaj.org/article/9d8a9bf7ea624bb3bd729d232e70997e
Etiquetas: Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
id oai:doaj.org-article:9d8a9bf7ea624bb3bd729d232e70997e
record_format dspace
spelling 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)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle 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
description 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