Study of history effect of vortex matter by AC susceptibility

Citation
Xf. Wu et al., Study of history effect of vortex matter by AC susceptibility, J SUPERCOND, 14(4), 2001, pp. 501-507
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF SUPERCONDUCTIVITY
ISSN journal
0896-1107 → ACNP
Volume
14
Issue
4
Year of publication
2001
Pages
501 - 507
Database
ISI
SICI code
0896-1107(200108)14:4<501:SOHEOV>2.0.ZU;2-E
Abstract
We have observed numerically the history effect, based on bulk flux pinning framework, in the susceptibility chi (T) (acs), experimentally measured in different samples. The dependencies of history effect in chi (T) on freque ncy, ac and dc fields, and bulk pinning strength are calculated. Our calcul ation matches well the behavior of chi in 2H-NbSe2, showing the bulk model works well. It is also shown that bulk pinning and surface pinning will res ult in a history effect of very different characteristics. In addition, the numerical result shows that a peak in critical current density, which is u sually accompanied by the vortex melting transition, may not be observed as a dip in acs in some cases, which is a dynamic response of a sample to app lied as field and is dependent on ac field frequency and amplitude.