A theoretical model is suggested which describes the effect of tilt boundaries
with chaotically arranged dislocations on the critical current density in
high-transition-temperature (Tc) superconductors.
Stress fields of such boundaries, that suppress high-Tc superconductivity,
are revealed to be long-range as compared to those of
tilt boundaries with periodically ordered grain boundary dislocations. With this factor
taken into consideration, the dependence of the critical current density accross tilt
boundaries on boundary misorientation q is calculated and compared with the experimental
data [1].
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