Visualizing the ac magnetic susceptibility of superconducting films via magneto-optical imaging

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dc.contributor.authorMotta, M.
dc.contributor.authorColauto, F.
dc.contributor.authorZadorosny, R. [UNESP]
dc.contributor.authorJohansen, T. H.
dc.contributor.authorDinner, R. B.
dc.contributor.authorBlamire, M. G.
dc.contributor.authorAtaklti, G. W.
dc.contributor.authorMoshchalkov, V. V.
dc.contributor.authorSilhanek, A. V.
dc.contributor.authorOrtiz, W. A.
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversity of Oslo
dc.contributor.institutionNorwegian Academy of Science and Letters
dc.contributor.institutionUniversity of Cambridge
dc.contributor.institutionKatholieke Universiteit Leuven
dc.contributor.institutionUniversité de Liège
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:26:21Z
dc.date.available2014-05-27T11:26:21Z
dc.date.issued2011-12-30
dc.description.abstractWe have established a link between the global ac response and the local flux distribution of superconducting films by combining magnetic ac susceptibility, dc magnetization, and magneto-optical measurements. The investigated samples are three Nb films: a plain specimen, used as a reference sample, and other two films patterned with square arrays of antidots. At low temperatures and small ac amplitudes of the excitation field, the Meissner screening prevents penetration of flux into the sample. Above a certain ac drive threshold, flux avalanches are triggered during the first cycle of the ac excitation. The subsequent periodic removal, inversion, and rise of flux occurs essentially through the already-created dendrites, giving rise to an ac susceptibility signal weakly dependent on the applied field. The intradendrite flux oscillation is followed, at higher values of the excitation field, by a more drastic process consisting of creation of new dendrites and antidendrites. In this more invasive regime, the ac susceptibility shows a clear field dependence. At higher temperatures a smooth penetration occurs, and the flux profile is characteristic of a critical state. We have also shown that the regime dominated by vortex avalanches can be reliably identified by ac susceptibility measurements. © 2011 American Physical Society.en
dc.description.affiliationDepartamento de Física Universidade Federal de São Carlos, 13565-905 São Carlos, SP
dc.description.affiliationDepartment of Physics University of Oslo, POB 1048, Blindern, NO-0316 Oslo
dc.description.affiliationCentre for Advanced Study Norwegian Academy of Science and Letters, NO-0271 Oslo
dc.description.affiliationDepartment of Materials Science University of Cambridge, Pembroke Street, Cambridge CB2 3QZ
dc.description.affiliationINPAC - Institute for Nanoscale Physics and Chemistry Nanoscale Superconductivity and Magnetism Group Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven
dc.description.affiliationDépartement de Physique Université de Liège, B-4000 Sart Tilman
dc.description.affiliationFaculdade de Engenharia UNESP - Universidade Estadual Paulista Departamento de Física e Química, 15385-000 Ilha Solteira, SP
dc.description.affiliationUnespFaculdade de Engenharia UNESP - Universidade Estadual Paulista Departamento de Física e Química, 15385-000 Ilha Solteira, SP
dc.identifierhttp://dx.doi.org/10.1103/PhysRevB.84.214529
dc.identifier.citationPhysical Review B - Condensed Matter and Materials Physics, v. 84, n. 21, 2011.
dc.identifier.doi10.1103/PhysRevB.84.214529
dc.identifier.file2-s2.0-84855302842.pdf
dc.identifier.issn1098-0121
dc.identifier.issn1550-235X
dc.identifier.lattes6913351251148957
dc.identifier.orcid0000-0002-2419-2049
dc.identifier.scopus2-s2.0-84855302842
dc.identifier.urihttp://hdl.handle.net/11449/73114
dc.language.isoeng
dc.relation.ispartofPhysical Review B: Condensed Matter and Materials Physics
dc.relation.ispartofsjr1,604
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.titleVisualizing the ac magnetic susceptibility of superconducting films via magneto-optical imagingen
dc.typeArtigo
dcterms.licensehttp://publish.aps.org/authors/transfer-of-copyright-agreement
unesp.author.lattes6913351251148957[3]
unesp.author.orcid0000-0002-2419-2049[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Ilha Solteirapt

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