ISSN:
1572-9605
Keywords:
Tapes
;
oriented bulk samples
;
I-V curves
;
collective pinning
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract The low-voltage-level current-voltage characteristics of Bi2Sr2Ca2Cu3O10+x tapes and bulk samples with preferential crystallite orientation were measured in applied magnetic fields both parallel and perpendicular to the samples' surfaces. The data were interpreted within the framework of the collective pinning model. The collective pinning exponentα changes from ≈1 to ≈0.5 (close toT c), while in the case of unoriented samples it is constant (and equal to the theoretical value 1/2) as shown in an earlier paper. We suggest that this temperature dependence ofα is due to the change of the dimensionality of the intragranular vortices.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00727550
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