ISSN:
1572-9605
Keywords:
HTSC thin films
;
critical current density
;
anisotropy
;
columnar defects
;
multilayers
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract Epitaxial YBa2Cu3O7−δ thin films (YBCO) and YBa2Cu3O7−δ /PrBa2Cu3O7−δ multilayers (Y/Pr) were irradiated with high-energy heavy ions (770 Mev208Pb) under various directionsφ relative to thec-axis. The irradiation resulted in columnar defects tilted byφ from thec-axis. The angular dependence of their pinning activity was studied by measuring the anisotropy of the critical current density. TheJ c (B, T,ϑ) behavior of the irradiated YBCO thin films showed an additional peak, which exceeds the intrinsic pinning peak, exactly at the irradiation direction. The Y/Pr multilayers, however, showed an isotropicT c -enhancement by a factor of 5, without any additional structure in theJ c(B, T,ϑ) curve.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00730395
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