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Title: Surface Effects on the Dynamic Behavior of Vortices in Type II Superconducting Strips with Periodic and Conformal Pinning Arrays

Abstract

Using molecular dynamics techniques, we simulate the vortex behavior in a type II superconducting strip in the presence of triangular and two types of conformal pinning arrays, one with a pinning gradient perpendicular to the driving force (C1) and the other parallel (C2), at zero temperature. A transport force is applied in the infinite direction of the strip, and the magnetic field is increased until the rate between the density of vortices (n{sub v}) and pinning (n{sub p}) reaches n{sub v}/n{sub p} = 1.5. Our results show a monotonic increase, by steps, of the vortex density with the applied magnetic field. Besides, each pinning lattice presents a different vortex penetration delay. For the triangular pinning array, different than the case of infinite films, here the system exhibits only one pronounced depinning force peak at n{sub v}/n{sub p} = 1. However, the depinning force peak is present for only one value of field, in the range of fields where n{sub v}/n{sub p} = 1 is stable. For the case of conformal pinning arrays, in analogy to what is observed in infinite films, no commensurability depinning force peaks were found. In the present case, the C1 array is more efficient at low fields, all arraysmore » are equivalent in the intermediate fields, and the C2 array is more efficient for high fields. We also show that for the C1 array at high fields, vortices depin following the conformal arches, from the edge to the center. For the C2 array, the depinning force is higher when compared to that of C1, because this particular conformal structure prevents the formation of easy vortex flow channels.« less

Authors:
;  [1];  [2];  [3]
  1. Universidade Estadual Paulista—UNESP, POSMAT—Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, Faculdade de Ciências (Brazil)
  2. University of Southampton, Department of Chemistry (United Kingdom)
  3. Universidade Estadual Paulista—UNESP, Departamento de Física, Faculdade de Ciências (Brazil)
Publication Date:
OSTI Identifier:
22773983
Resource Type:
Journal Article
Journal Name:
Journal of Superconductivity and Novel Magnetism
Additional Journal Information:
Journal Volume: 31; Journal Issue: 7; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1557-1939
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; MAGNETIC FIELDS; MAGNETIC FLUX; MOLECULAR DYNAMICS METHOD; PERIODICITY; SUPERCONDUCTIVITY; SURFACES; TEMPERATURE ZERO K; THIN FILMS; TYPE-II SUPERCONDUCTORS; VORTEX FLOW; VORTICES

Citation Formats

Vizarim, N. P., E-mail: nicolas.vizarim@fc.unesp.br, Carlone, M., Verga, L. G., and Venegas, P. A. Surface Effects on the Dynamic Behavior of Vortices in Type II Superconducting Strips with Periodic and Conformal Pinning Arrays. United States: N. p., 2018. Web. doi:10.1007/S10948-017-4452-3.
Vizarim, N. P., E-mail: nicolas.vizarim@fc.unesp.br, Carlone, M., Verga, L. G., & Venegas, P. A. Surface Effects on the Dynamic Behavior of Vortices in Type II Superconducting Strips with Periodic and Conformal Pinning Arrays. United States. doi:10.1007/S10948-017-4452-3.
Vizarim, N. P., E-mail: nicolas.vizarim@fc.unesp.br, Carlone, M., Verga, L. G., and Venegas, P. A. Sun . "Surface Effects on the Dynamic Behavior of Vortices in Type II Superconducting Strips with Periodic and Conformal Pinning Arrays". United States. doi:10.1007/S10948-017-4452-3.
@article{osti_22773983,
title = {Surface Effects on the Dynamic Behavior of Vortices in Type II Superconducting Strips with Periodic and Conformal Pinning Arrays},
author = {Vizarim, N. P., E-mail: nicolas.vizarim@fc.unesp.br and Carlone, M. and Verga, L. G. and Venegas, P. A.},
abstractNote = {Using molecular dynamics techniques, we simulate the vortex behavior in a type II superconducting strip in the presence of triangular and two types of conformal pinning arrays, one with a pinning gradient perpendicular to the driving force (C1) and the other parallel (C2), at zero temperature. A transport force is applied in the infinite direction of the strip, and the magnetic field is increased until the rate between the density of vortices (n{sub v}) and pinning (n{sub p}) reaches n{sub v}/n{sub p} = 1.5. Our results show a monotonic increase, by steps, of the vortex density with the applied magnetic field. Besides, each pinning lattice presents a different vortex penetration delay. For the triangular pinning array, different than the case of infinite films, here the system exhibits only one pronounced depinning force peak at n{sub v}/n{sub p} = 1. However, the depinning force peak is present for only one value of field, in the range of fields where n{sub v}/n{sub p} = 1 is stable. For the case of conformal pinning arrays, in analogy to what is observed in infinite films, no commensurability depinning force peaks were found. In the present case, the C1 array is more efficient at low fields, all arrays are equivalent in the intermediate fields, and the C2 array is more efficient for high fields. We also show that for the C1 array at high fields, vortices depin following the conformal arches, from the edge to the center. For the C2 array, the depinning force is higher when compared to that of C1, because this particular conformal structure prevents the formation of easy vortex flow channels.},
doi = {10.1007/S10948-017-4452-3},
journal = {Journal of Superconductivity and Novel Magnetism},
issn = {1557-1939},
number = 7,
volume = 31,
place = {United States},
year = {2018},
month = {7}
}