Memory effects and peak effect in type II superconductors

A large amount of experimental and theoretical work has been devoted to understand memory effects (ME) in the solid vortex lattice (VL) but has remained, however, controversial until now. In the vicinity of the anomaly known as the peak effect (PE) both the VL mobility and the measured critical curr...

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Detalles Bibliográficos
Autores principales:	Pasquini, G., Luna, D., Eismann, B., Bettachini, V., Bekeris, V.
Formato:	JOUR
Materias:	High and low Tc superconductors vortex lattice Memory effects Peak effect Vortex lattice Labusch constant Critical current density (superconductivity) Crystal lattices Nonlinear analysis Superconducting materials
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_09214526_v398_n2_p420_Pasquini
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_09214526_v398_n2_p420_Pasquini
record_format	dspace
spelling	todo:paper_09214526_v398_n2_p420_Pasquini2023-10-03T15:45:19Z Memory effects and peak effect in type II superconductors Pasquini, G. Luna, D. Eismann, B. Bettachini, V. Bekeris, V. High and low Tc superconductors vortex lattice Memory effects Peak effect Vortex lattice Labusch constant Memory effects Peak effect Vortex lattice Critical current density (superconductivity) Crystal lattices Nonlinear analysis Superconducting materials A large amount of experimental and theoretical work has been devoted to understand memory effects (ME) in the solid vortex lattice (VL) but has remained, however, controversial until now. In the vicinity of the anomaly known as the peak effect (PE) both the VL mobility and the measured critical current density are found to be dependent of the dynamical history of the sample, in both low Tc (LTS) and high Tc (HTS) superconductors. Experiments in YBa2Cu3O7 (YBCO) crystals have shown that the mobility of the VL increases after assisting the system with a symmetric AC field (or current) of moderated amplitude. On the other hand, after an asymmetric AC field assists vortices, the VL becomes less mobile. These features indicate that ME in these samples cannot be ascribed to an equilibration process, but probably are related to the organization of the lattice after nearest neighbor re-accommodation or induced plastic VL deformation. Recently, we have shown evidence that in YBCO the PE is a dynamic anomaly observed in the non-linear response, and is absent in the Labusch constant derived from the linear Campbell regime. However, this behavior seems not to be extensive to other systems as the traditional LTS NbSe2. In this work, the AC response in the PE region of NbSe2 and YBCO samples are presented and compared. Very salient differences both in the linear and non-linear response as well as in the ME characteristics indicate that a different physics governs the PE phenomena in each case. © 2007 Elsevier B.V. All rights reserved. Fil:Pasquini, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bekeris, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09214526_v398_n2_p420_Pasquini
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	High and low Tc superconductors vortex lattice Memory effects Peak effect Vortex lattice Labusch constant Memory effects Peak effect Vortex lattice Critical current density (superconductivity) Crystal lattices Nonlinear analysis Superconducting materials
spellingShingle	High and low Tc superconductors vortex lattice Memory effects Peak effect Vortex lattice Labusch constant Memory effects Peak effect Vortex lattice Critical current density (superconductivity) Crystal lattices Nonlinear analysis Superconducting materials Pasquini, G. Luna, D. Eismann, B. Bettachini, V. Bekeris, V. Memory effects and peak effect in type II superconductors
topic_facet	High and low Tc superconductors vortex lattice Memory effects Peak effect Vortex lattice Labusch constant Memory effects Peak effect Vortex lattice Critical current density (superconductivity) Crystal lattices Nonlinear analysis Superconducting materials
description	A large amount of experimental and theoretical work has been devoted to understand memory effects (ME) in the solid vortex lattice (VL) but has remained, however, controversial until now. In the vicinity of the anomaly known as the peak effect (PE) both the VL mobility and the measured critical current density are found to be dependent of the dynamical history of the sample, in both low Tc (LTS) and high Tc (HTS) superconductors. Experiments in YBa2Cu3O7 (YBCO) crystals have shown that the mobility of the VL increases after assisting the system with a symmetric AC field (or current) of moderated amplitude. On the other hand, after an asymmetric AC field assists vortices, the VL becomes less mobile. These features indicate that ME in these samples cannot be ascribed to an equilibration process, but probably are related to the organization of the lattice after nearest neighbor re-accommodation or induced plastic VL deformation. Recently, we have shown evidence that in YBCO the PE is a dynamic anomaly observed in the non-linear response, and is absent in the Labusch constant derived from the linear Campbell regime. However, this behavior seems not to be extensive to other systems as the traditional LTS NbSe2. In this work, the AC response in the PE region of NbSe2 and YBCO samples are presented and compared. Very salient differences both in the linear and non-linear response as well as in the ME characteristics indicate that a different physics governs the PE phenomena in each case. © 2007 Elsevier B.V. All rights reserved.
format	JOUR
author	Pasquini, G. Luna, D. Eismann, B. Bettachini, V. Bekeris, V.
author_facet	Pasquini, G. Luna, D. Eismann, B. Bettachini, V. Bekeris, V.
author_sort	Pasquini, G.
title	Memory effects and peak effect in type II superconductors
title_short	Memory effects and peak effect in type II superconductors
title_full	Memory effects and peak effect in type II superconductors
title_fullStr	Memory effects and peak effect in type II superconductors
title_full_unstemmed	Memory effects and peak effect in type II superconductors
title_sort	memory effects and peak effect in type ii superconductors
url	http://hdl.handle.net/20.500.12110/paper_09214526_v398_n2_p420_Pasquini
work_keys_str_mv	AT pasquinig memoryeffectsandpeakeffectintypeiisuperconductors AT lunad memoryeffectsandpeakeffectintypeiisuperconductors AT eismannb memoryeffectsandpeakeffectintypeiisuperconductors AT bettachiniv memoryeffectsandpeakeffectintypeiisuperconductors AT bekerisv memoryeffectsandpeakeffectintypeiisuperconductors
_version_	1807321550802649088

Memory effects and peak effect in type II superconductors

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