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Material laws and related uncommon phenomena in the electromagnetic response of type-II superconductors in longitudinal geometry

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journal contribution
posted on 12.05.2020, 09:15 by HS Ruiz, A Badia-Majos, C Lopez
Relying on our theoretical approach for the superconducting critical state problem in 3D magnetic field configurations, we present an exhaustive analysis of the electrodynamic response for the so-called longitudinal transport problem in the slab geometry. A wide set of experimental conditions have been considered, including modulation of the applied magnetic field either perpendicular or parallel (longitudinal) to the transport current density. The main objective of our work was to characterize the role of the macroscopic material law that should properly account for the underlying mechanisms of flux cutting and depinning. The intriguing occurrence of negative current patterns and the enhancement of the transport current flow along the center of the superconducting sample are reproduced as a straightforward consequence of the magnetically induced internal anisotropy. Moreover, we show that related to a maximal projection of the current density vector onto the local magnetic field, a maximal transport current density occurs somewhere within the sample. The elusive measurement of the flux cutting threshold (critical value of such parallel component Jc||) is suggested on the basis of local measurements of the transport current density. Finally, we show that a high correlation exists between the evolution of the transport current density and the appearance of paramagnetic peak structures in terms of the applied longitudinal magnetic field.

Funding

This work was supported by Spanish CICyT and FEDER program (project MAT2008-05983-C03-01) and by the DGA grant T12/2011. H. S. Ruiz acknowledges the financial support provided by the Spanish CSIC JAE-program.

History

Citation

Superconductor Science & Technology, 2011, 24(11), 115005

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

AM (Accepted Manuscript)

Published in

Superconductor Science & Technology

Volume

24

Issue

11

Pagination

115005

Publisher

IOP Publishing

issn

0953-2048

Copyright date

2011

Available date

30/09/2011

Publisher version

https://iopscience.iop.org/article/10.1088/0953-2048/24/11/115005/meta

Language

en

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