ISSN:
1572-9605
Keywords:
Tapes
;
grain orientation
;
dissipation
;
critical-current density
;
vortex-antivortex unbinding
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract Current-voltage characteristics of Bi2Sr2Ca2Cu3O10 tapes and bulk samples with preferentially oriented crystallites have been measured in zero applied magnetic field and for temperatures close to the mean-field critical-temperature,T c0. It was shown that the power-law dependence,V=AI a, valid for two-dimensional systems, does not correctly describe the data, which clearly indicate the existence of a finite critical-current density,J c. The experimentalI-V curves are fitted quite well with the model which attributes the finite critical-current density to the coupling between the CuO2 double layers. It was found thatJ c vanishes at a temperature value belowT c0. This behavior can result from the occurrence of vortex fluctuation-induced layer decoupling and/or from the contribution of entropy to the vortex unbinding process.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00723528
Permalink