Nonlinear alternating current susceptibility studies of high-T-c rings: Influence of the structuring method and determination of the flux creep exponent

Citation
S. Streubel et al., Nonlinear alternating current susceptibility studies of high-T-c rings: Influence of the structuring method and determination of the flux creep exponent, J APPL PHYS, 87(12), 2000, pp. 8621-8627
Citations number
22
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF APPLIED PHYSICS
ISSN journal
00218979 → ACNP
Volume
87
Issue
12
Year of publication
2000
Pages
8621 - 8627
Database
ISI
SICI code
0021-8979(20000615)87:12<8621:NACSSO>2.0.ZU;2-5
Abstract
We have studied the influence of the patterning procedure on the critical c urrent density of high-T-c YBa2Cu3O7-delta thin rings using the nonlinear a c susceptibility method. At no applied dc magnetic field have we found that laser ablation strongly degrades the critical current density whereas ion beam etching has only a weak influence on it. From the measurements at diff erent frequencies and at dc magnetic fields we analyzed the influence of fl ux creep and obtained the field dependence of the flux creep exponent. Our data reconfirm the recently observed scaling relation for the nonlinear sus ceptibility response of type-II superconductors. (C) 2000 American Institut e of Physics. [S0021- 8979(00)02312-4].