Experimental verification for a scaling law relating amplitude and frequency in the complex susceptibility of type-II superconductors

dc.creatorCardoso, CA
dc.creatorde Lima, OF
dc.date2000
dc.date42156
dc.date2014-12-02T16:26:59Z
dc.date2015-11-26T17:28:40Z
dc.date2014-12-02T16:26:59Z
dc.date2015-11-26T17:28:40Z
dc.date.accessioned2018-03-29T00:15:46Z
dc.date.available2018-03-29T00:15:46Z
dc.identifierPhysica C. Elsevier Science Bv, v. 334, n. 41732, n. 185, n. 195, 2000.
dc.identifier0921-4534
dc.identifierWOS:000087526700007
dc.identifier10.1016/S0921-4534(00)00265-3
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/79973
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/79973
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/79973
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1285110
dc.descriptionIn this work we present complex susceptibility measurements chi(h,v), for a large range of field amplitudes h and frequencies v, taken in two Nb samples (one single crystal and one polycrystal) and one melt-textured YBa2Cu3O7-delta sample. A predicted scaling law for chi(h,v) is verified for several sets of data, plotted against the scaling variable h(v(ref)/v)(1/(n-1)), where v(ref) is an arbitrary reference frequency and n is a creep exponent. Data taken closer to T-c revealed a useful scaling applied directly to the critical current density J(c), evaluated through the peak position of the imaginary component chi '. An unexpected frequency dependence of n was observed for the YBa2Cu3O7-delta sample. This is associated with a failure of the logarithmic approximation for the activation energy U = U(c)ln(J(c)/J), which is assumed in the scaling formalism. A more accurate description in this case is obtained with U = U-c(J/J(c))(-mu), from the collective creep theory. This type of analysis led us to propose an effective creep exponent n(eff), in an attempt to keep the original scaling law. (C) 2000 Elsevier Science B.V. All rights reserved.
dc.description334
dc.description41732
dc.description185
dc.description195
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationPhysica C
dc.relationPhysica C
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectcomplex susceptibility
dc.subjectAC susceptibility scaling
dc.subjectnonlinear ac response
dc.subjectcollective flux creep
dc.subjectHigh-temperature Superconductors
dc.subjectMelt-textured Yba2cu3o7-delta
dc.subjectAxial Magnetic-field
dc.subjectGiant Flux Creep
dc.subjectBa-cu-o
dc.subjectAc Susceptibility
dc.subjectSingle-crystal
dc.subjectCritical-state
dc.subjectIrreversibility
dc.subjectRelaxation
dc.titleExperimental verification for a scaling law relating amplitude and frequency in the complex susceptibility of type-II superconductors
dc.typeArtículos de revistas


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