Flux flow of Abrikosov-Josephson vortices along grain boundaries in high-temperature superconductors

Details Flux flow of Abrikosov-Josephson vortices along grain boundaries in high-temperature superconductors Flux flow of Abrikosov-Josephson vortices along grain boundaries in high-temperature superconductors

2002-01-15

arxiv.org/abs/cond-mat/0201234v1

Physics

Condensed Matter

Superconductivity

5 pages 5 figures. Phys. Rev. Lett. (accepted)

Scientific paper

10.1103/PhysRevLett.88.097001

We show that low-angle grain boundaries (GB) in high-temperature superconductors exhibit intermediate Abrikosov vortices with Josephson cores, whose length $l$ along GB is smaller that the London penetration depth, but larger than the coherence length. We found an exact solution for a periodic vortex structure moving along GB 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 $7^{\circ}$ unirradiated and irradiated $YBa_2Cu_3O_7$ bicrystals, from which the core size $l(T)$, and the intrinsic depairing density $J_b(T)$ on nanoscales of few GB dislocations were measured for the first time. The observed temperature dependence of $J_b(T)=J_{b0}(1-T/T_c)^2$ indicates a significant order parameter suppression in current channels between GB dislocation cores.

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