Article (Scientific journals)
Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state
Bag, Biplab; Shaw, Gorky; Banerjee, S. S. et al.
2017In Scientific Reports, 7 (1), p. 5531
Peer Reviewed verified by ORBi
 

Files


Full Text
Biplab_Sci_Rep_2017.pdf
Publisher postprint (4.23 MB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Abstract :
[en] 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 ( $$\boldsymbolI_\boldsymbolc^\boldsymbolh$$ I c h ) with unconventional depinning characteristics. At currents well above $$\boldsymbolI_\boldsymbolc^\boldsymbolh$$ 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 $$\boldsymbolI_\boldsymbolc^\boldsymbolh$$ 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 $$\boldsymbolI_\boldsymbolc^\boldsymbolh$$ 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 $$\boldsymbolI_\boldsymbolc^\boldsymbolh$$ 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 $$\boldsymbolI_\boldsymbolc^\boldsymbolh$$ I c h .
Disciplines :
Physics
Author, co-author :
Bag, Biplab
Shaw, Gorky ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Banerjee, S. S.
Majumdar, Sayantan
Sood, A. K.
Grover, A. K.
Language :
English
Title :
Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state
Publication date :
17 July 2017
Journal title :
Scientific Reports
eISSN :
2045-2322
Publisher :
Nature Publishing Group, London, United Kingdom
Volume :
7
Issue :
1
Pages :
5531
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 24 July 2017

Statistics


Number of views
67 (4 by ULiège)
Number of downloads
0 (0 by ULiège)

Scopus citations®
 
9
Scopus citations®
without self-citations
5
OpenCitations
 
6

Bibliography


Similar publications



Contact ORBi