SUPERPOSITION OF CURRENTS IN HARD SUPERCONDUCTORS PLACED INTO CROSSEDAC AND DC MAGNETIC-FIELDS

Citation
Lm. Fisher et al., SUPERPOSITION OF CURRENTS IN HARD SUPERCONDUCTORS PLACED INTO CROSSEDAC AND DC MAGNETIC-FIELDS, Solid state communications, 97(10), 1996, pp. 833-836
Citations number
9
Categorie Soggetti
Physics, Condensed Matter
Journal title
ISSN journal
00381098
Volume
97
Issue
10
Year of publication
1996
Pages
833 - 836
Database
ISI
SICI code
0038-1098(1996)97:10<833:SOCIHS>2.0.ZU;2-J
Abstract
The superposition of currents in YBCO melt-textured samples placed int o crossed ac and de magnetic fields is predicted and observed. This su perposition is a direct consequence of the critical state model. The d e magnetic field distribution is shown to become uniform wherever the ac field has penetrated. Owing to this nonlinear process, the area of the dc magnetization loop diminishes and eventually disappears complet ely with an increase of the ac field magnitude. This means that under the action of the external ac field, the static magnetic properties of hard superconductors change and tend to the well known properties of soft ones.