Flux flow of Abrikosov-Josephson vortices along grain boundaries in high-temperature superconductors.
Phys Rev Lett
; 88(9): 097001, 2002 Mar 04.
Article
em En
| MEDLINE
| ID: mdl-11864043
ABSTRACT
Low-angle grain boundaries (GBs) in superconductors exhibit intermediate Abrikosov vortices with Josephson cores, whose length l along GB is smaller than the London penetration depth, but larger than the coherence length. We found an exact solution for a periodic vortex structure moving along GBs in a magnetic field H and calculated the flux flow resistivity R(F)(H), and the nonlinear voltage-current characteristics. The predicted R(F)(H) dependence describes well our experimental data on 7 unirradiated and irradiated YBa(2)Cu(3)O(7) bicrystals, from which the core size l(T), and the intrinsic depairing density J(b)(T) on nanoscales of a few GB dislocations were measured for the first time. The observed J(b)(T) = J(b0)(1-T/T(c))(2) indicates a significant order parameter suppression on GB.
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MEDLINE
Tipo de estudo:
Prognostic_studies
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En
Ano de publicação:
2002
Tipo de documento:
Article