Flux flow of Abrikosov-Josephson vortices along grain boundaries in high-temperature superconductors.
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.
Gurevich
A
A
Applied Superconductivity Center, University of Wisconsin, Madison, WI, USA.
Rzchowski
M S
MS
Daniels
G
G
Patnaik
S
S
Hinaus
B M
BM
Carillo
F
F
Tafuri
F
F
Larbalestier
D C
DC