File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Distinct correlation effect in magnetization relaxation from the Bean critical state in type-II superconductors

TitleDistinct correlation effect in magnetization relaxation from the Bean critical state in type-II superconductors
Authors
Issue Date1995
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/physc
Citation
Physica C: Superconductivity And Its Applications, 1995, v. 249 n. 1-2, p. 39-46 How to Cite?
AbstractThe magnetization relaxation in type-II superconductors is modelled by a thermally assisted two-dimensional sandpile model. The model reveals a distinct correlation effect, or the effect of flux avalanche in the initial stage of relaxation from the Bean critical state. The effective energy Ueff(J) ≡ -kT ln|dJ/d| where J is the current density, is n in this regime although the activation energy U(J) assumed beforehand is linear. The extracted scaling exponent α ≈ 0.5 (noticeably robust against different temperatures), which characterizes the current density dependence of the linear size of the avalanche cluster with l ≈ (1 - J Jc0)-α, is in rough agreement with the theoretical estimation. As the system is driven away from the Bean critical state, flux avalanche plays less and less a role since the linear size of the characteristic avalanche cluster meets the distance between the pinning centers, and the usual logarithmic decay of the Anderson-Kim model is recovered. It is argued from further analysis that the scaling behavior together with the exponent α = 0.5 is a univeral feature of the present model, irrespectively of the linear or nonlinear details of the U(J) function, or equivalently the underlying pinning mechanism. The relevance of our results is also discussed. © 1995.
Persistent Identifierhttp://hdl.handle.net/10722/80564
ISSN
2015 Impact Factor: 0.835
2015 SCImago Journal Rankings: 0.472

 

DC FieldValueLanguage
dc.contributor.authorWang, QHen_HK
dc.contributor.authorYao, XXen_HK
dc.contributor.authorWang, ZDen_HK
dc.date.accessioned2010-09-06T08:07:50Z-
dc.date.available2010-09-06T08:07:50Z-
dc.date.issued1995en_HK
dc.identifier.citationPhysica C: Superconductivity And Its Applications, 1995, v. 249 n. 1-2, p. 39-46en_HK
dc.identifier.issn0921-4534en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80564-
dc.description.abstractThe magnetization relaxation in type-II superconductors is modelled by a thermally assisted two-dimensional sandpile model. The model reveals a distinct correlation effect, or the effect of flux avalanche in the initial stage of relaxation from the Bean critical state. The effective energy Ueff(J) ≡ -kT ln|dJ/d| where J is the current density, is n in this regime although the activation energy U(J) assumed beforehand is linear. The extracted scaling exponent α ≈ 0.5 (noticeably robust against different temperatures), which characterizes the current density dependence of the linear size of the avalanche cluster with l ≈ (1 - J Jc0)-α, is in rough agreement with the theoretical estimation. As the system is driven away from the Bean critical state, flux avalanche plays less and less a role since the linear size of the characteristic avalanche cluster meets the distance between the pinning centers, and the usual logarithmic decay of the Anderson-Kim model is recovered. It is argued from further analysis that the scaling behavior together with the exponent α = 0.5 is a univeral feature of the present model, irrespectively of the linear or nonlinear details of the U(J) function, or equivalently the underlying pinning mechanism. The relevance of our results is also discussed. © 1995.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/physcen_HK
dc.relation.ispartofPhysica C: Superconductivity and its applicationsen_HK
dc.rightsPhysica C: Superconductivity and its Applications. Copyright © Elsevier BV.en_HK
dc.titleDistinct correlation effect in magnetization relaxation from the Bean critical state in type-II superconductorsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0921-4534&volume=249&spage=39&epage=46&date=1995&atitle=Distinct+correlation+effect+in+magnetization+relaxation+from+the+bean+critical+state+in+type-II+superconductorsen_HK
dc.identifier.emailWang, ZD: zwang@hkucc.hku.hken_HK
dc.identifier.authorityWang, ZD=rp00802en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0029336342en_HK
dc.identifier.hkuros9272en_HK
dc.identifier.volume249en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage39en_HK
dc.identifier.epage46en_HK
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWang, QH=7406916485en_HK
dc.identifier.scopusauthoridYao, XX=7402529493en_HK
dc.identifier.scopusauthoridWang, ZD=14828459100en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats