Three-dimensional and two-dimensional high field vortex fluctuations in deoxygenated YBa2Cu3O7-x depending on the vicinity of T-c(H)

dc.creatorSalem-Sugui, S
dc.creatorda Silva, EZ
dc.creatorAlvarenga, AD
dc.date2006
dc.dateSEP 1
dc.date2014-11-16T07:22:46Z
dc.date2015-11-26T16:20:52Z
dc.date2014-11-16T07:22:46Z
dc.date2015-11-26T16:20:52Z
dc.date.accessioned2018-03-28T23:03:08Z
dc.date.available2018-03-28T23:03:08Z
dc.identifierPhysica C-superconductivity And Its Applications. Elsevier Science Bv, v. 443, n. 41671, n. 1, n. 4, 2006.
dc.identifier0921-4534
dc.identifierWOS:000239672400001
dc.identifier10.1016/j.physc.2006.04.087
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/58225
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/58225
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/58225
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1267876
dc.descriptionWe analyzed reversible magnetization data, M versus T curves, of three single crystals of YBa2Cu3O7-x,(Y123), with superconducting transition temperatures T-c = 62.5 (x = 0.35), 52 (x = 0.5), and 41 K (x = 0.6). M versus T curves of each sample exhibited a field independent crossing point, M(T*), occurring close to the superconductor critical temperature. These crossing points were shown to be due to fluctuations of vortices. Besides the reversible data of each sample were shown to obey a two-dimensional diamagnetic lowest-Landau-level (LLL) fluctuation theory, it is shown here that the data, within a temperature region where the crossing points occur for two samples (62.5 K and 52 K), are also explained by a three-dimensional version of this fluctuation theory. Since the crossing points for these two samples occur close to T, these are interpreted as been due to three-dimensional vortex fluctuations instead two-dimensional ones. An expression for the field independent magnetization, M(T*), which is expected to occur at the crossing point of the various M versus T curves, is obtained for the case of three-dimensional vortex fluctuations, and compared to the experimental values of M(T*). This comparison produced consistent values for the coherence length along the c-axis of the samples with T, = 62.5 and 52 K, solving an inconsistent result previously published, when experimental values of M(T*) were compared with an expression obtained from two-dimensional vortex-fluctuations. The results of the present work show that, despite the fact that two-dimensional LLL fluctuations scaling is obeyed in a much wider temperature range for two studied samples (T-c = 52 (x = 0.5), and 62.5 K (x = 0.35)) when compared to the 3D-LLL scaling form, these systems behave as three-dimensional for temperatures close to T,(H). (c) 2006 Elsevier B.V. All rights reserved.
dc.description443
dc.description41671
dc.description1
dc.description4
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationPhysica C-superconductivity And Its Applications
dc.relationPhysica C
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjecthigh field diamagnetic fluctuations in deoxygenated YBaCuO
dc.subjectfluctuations of lowest-Landau-level
dc.subjectfluctuations of vortices
dc.subjectIi Superconductors
dc.subjectDiamagnetic Fluctuations
dc.subjectMagnetic-field
dc.subjectVortices
dc.titleThree-dimensional and two-dimensional high field vortex fluctuations in deoxygenated YBa2Cu3O7-x depending on the vicinity of T-c(H)
dc.typeArtículos de revistas


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