Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy

In type-II superconductors, the macroscopic response of vortex matter to an external perturbation depends on the local interaction of flux lines with the pinning landscape (pinscape). The (Campbell) penetration depth λC of an ac field perturbation is often associated with a phenomenological pinning...

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Autores principales: Willa, R., Marziali Bermúdez, M., Pasquini, G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_24699950_v98_n18_p_Willa
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_24699950_v98_n18_p_Willa2023-10-03T16:41:46Z Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy Willa, R. Marziali Bermúdez, M. Pasquini, G. In type-II superconductors, the macroscopic response of vortex matter to an external perturbation depends on the local interaction of flux lines with the pinning landscape (pinscape). The (Campbell) penetration depth λC of an ac field perturbation is often associated with a phenomenological pinning curvature. However, this basic approach is unable to capture thermal hysteresis effects observed in a variety of superconductors. The recently developed framework of strong-pinning theory has established a quantitative relationship between the microscopic pinscape and macroscopic observables. Specifically, it identifies history-dependent vortex arrangements as the primary source for thermal hysteresis in the Campbell response. In this work, we show that this interpretation is well-suited to capture the experimental results of the clean superconductor NbSe2, as observed through Campbell response (linear ac susceptibility) and small-angle neutron scattering measurements. Furthermore, we exploit the hysteretic Campbell response upon thermal cycling to extract the temperature dependence of microscopic pinning parameters from bulk measurements, specifically the pinning force and pinning length. This spectroscopic tool may stimulate further pinscape characterization in other superconducting systems. © 2018 American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_24699950_v98_n18_p_Willa
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description In type-II superconductors, the macroscopic response of vortex matter to an external perturbation depends on the local interaction of flux lines with the pinning landscape (pinscape). The (Campbell) penetration depth λC of an ac field perturbation is often associated with a phenomenological pinning curvature. However, this basic approach is unable to capture thermal hysteresis effects observed in a variety of superconductors. The recently developed framework of strong-pinning theory has established a quantitative relationship between the microscopic pinscape and macroscopic observables. Specifically, it identifies history-dependent vortex arrangements as the primary source for thermal hysteresis in the Campbell response. In this work, we show that this interpretation is well-suited to capture the experimental results of the clean superconductor NbSe2, as observed through Campbell response (linear ac susceptibility) and small-angle neutron scattering measurements. Furthermore, we exploit the hysteretic Campbell response upon thermal cycling to extract the temperature dependence of microscopic pinning parameters from bulk measurements, specifically the pinning force and pinning length. This spectroscopic tool may stimulate further pinscape characterization in other superconducting systems. © 2018 American Physical Society.
format JOUR
author Willa, R.
Marziali Bermúdez, M.
Pasquini, G.
spellingShingle Willa, R.
Marziali Bermúdez, M.
Pasquini, G.
Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy
author_facet Willa, R.
Marziali Bermúdez, M.
Pasquini, G.
author_sort Willa, R.
title Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy
title_short Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy
title_full Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy
title_fullStr Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy
title_full_unstemmed Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy
title_sort thermal hysteresis of the campbell response as a probe for bulk pinning landscape spectroscopy
url http://hdl.handle.net/20.500.12110/paper_24699950_v98_n18_p_Willa
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AT marzialibermudezm thermalhysteresisofthecampbellresponseasaprobeforbulkpinninglandscapespectroscopy
AT pasquinig thermalhysteresisofthecampbellresponseasaprobeforbulkpinninglandscapespectroscopy
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