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...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Pasquini, Gabriela, Bekeris, Victoria Isabel
Publicado:	2007
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:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v398_n2_p420_Pasquini 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	paper:paper_09214526_v398_n2_p420_Pasquini
record_format	dspace
spelling	paper:paper_09214526_v398_n2_p420_Pasquini2023-06-08T15:50:31Z Memory effects and peak effect in type II superconductors Pasquini, Gabriela Bekeris, Victoria Isabel 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. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v398_n2_p420_Pasquini 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, Gabriela Bekeris, Victoria Isabel 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.
author	Pasquini, Gabriela Bekeris, Victoria Isabel
author_facet	Pasquini, Gabriela Bekeris, Victoria Isabel
author_sort	Pasquini, Gabriela
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
publishDate	2007
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v398_n2_p420_Pasquini http://hdl.handle.net/20.500.12110/paper_09214526_v398_n2_p420_Pasquini
work_keys_str_mv	AT pasquinigabriela memoryeffectsandpeakeffectintypeiisuperconductors AT bekerisvictoriaisabel memoryeffectsandpeakeffectintypeiisuperconductors
_version_	1768541618091065344

Memory effects and peak effect in type II superconductors

Ejemplares similares