Flux Flow of Abrikosov-Josephson Vortices along Grain Boundaries in High-Temperature Superconductors
A. Gurevich, M. S. Rzchowski, G. Daniels, S. Patnaik, B. M. Hinaus, F. Carillo, F. Tafuri, D. C. Larbalestier
DOI 10.1103/PhysRevLett.88.097001 · Physical Review Letters
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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 RF(H), and the nonlinear voltage-current characteristics. The predicted RF(H) dependence describes well our experimental data on 7° unirradiated and irradiated YBa2Cu3O7 bicrystals, from which the core size l(T), and the intrinsic depairing density Jb(T) on nanoscales of a few GB dislocations were measured for the first time. The observed Jb(T)=Jb0(1−T/Tc)2 indicates a significant order parameter suppression on GB.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
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