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Vortex Dynamics and Pinning Properties Analysis of MgB 2 Bulk Samples by ac Susceptibility Measurements

Senatore, C.; Polichetti, M.; Zola, Danilo; Di Matteo, Tiziana; Giunchi, Giovanni; Pacheco, A J

Description

Flux line dynamics have been investigated on MgB2 bulk superconductors obtained by reactive liquid infiltration by measuring the ac magnetic susceptibility. The fundamental and third harmonics have been studied as a function of temperature, dc magnetic field, ac field amplitude and frequency. In order to determine the dynamical regimes governing the vortex motion, the experimental results have been compared with susceptibility curves obtained by numerical calculations of the non-linear...[Show more]

dc.contributor.authorSenatore, C.
dc.contributor.authorPolichetti, M.
dc.contributor.authorZola, Danilo
dc.contributor.authorDi Matteo, Tiziana
dc.contributor.authorGiunchi, Giovanni
dc.contributor.authorPacheco, A J
dc.date.accessioned2015-12-13T23:08:23Z
dc.identifier.issn0953-2048
dc.identifier.urihttp://hdl.handle.net/1885/86657
dc.description.abstractFlux line dynamics have been investigated on MgB2 bulk superconductors obtained by reactive liquid infiltration by measuring the ac magnetic susceptibility. The fundamental and third harmonics have been studied as a function of temperature, dc magnetic field, ac field amplitude and frequency. In order to determine the dynamical regimes governing the vortex motion, the experimental results have been compared with susceptibility curves obtained by numerical calculations of the non-linear diffusion equation for the magnetic field. The frequency behaviour of the third harmonic response, that cannot be explained by frequency dependent critical state models, has been related to the current dependence of the flux creep activation energy U(J) in the diffusion coefficient. In this way we have shown that the measured curves are correctly interpreted within the framework of a vortex glass description.
dc.publisherInstitute of Physics Publishing
dc.sourceSuperconductor Science and Technology
dc.subjectKeywords: Activation energy; Diffusion; Harmonic analysis; Infiltration; Magnesium compounds; Magnetic fields; Magnetic susceptibility; Vortex dynamics; Superconducting materials
dc.titleVortex Dynamics and Pinning Properties Analysis of MgB 2 Bulk Samples by ac Susceptibility Measurements
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume16
dc.date.issued2003
local.identifier.absfor020406 - Surfaces and Structural Properties of Condensed Matter
local.identifier.ariespublicationMigratedxPub15589
local.type.statusPublished Version
local.contributor.affiliationSenatore, C, Universita degli Studi di Salerno and INFM
local.contributor.affiliationPolichetti, M, Universita degli Studi di Salerno and INFM
local.contributor.affiliationZola, Danilo, Universita degli Studi di Salerno and INFM
local.contributor.affiliationDi Matteo, Tiziana, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGiunchi, Giovanni, EDISON S.p.A
local.contributor.affiliationPacheco, A J, Comision Nacional de Energia Atomica
local.description.embargo2037-12-31
local.bibliographicCitation.startpage183
local.bibliographicCitation.lastpage187
local.identifier.doi10.1088/0953-2048/16/2/310
dc.date.updated2015-12-12T08:13:22Z
local.identifier.scopusID2-s2.0-0037321770
CollectionsANU Research Publications

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