4 research outputs found

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

    Full text link
    We show that low-angle grain boundaries (GB) in high-temperature superconductors exhibit intermediate Abrikosov vortices with Josephson cores, whose length ll 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 HH and calculated the flux flow resistivity RF(H)R_F(H), and the nonlinear voltage-current characteristics. The predicted RF(H)R_F(H) dependence describes well our experimental data on 77^{\circ} unirradiated and irradiated YBa2Cu3O7YBa_2Cu_3O_7 bicrystals, from which the core size l(T)l(T), and the intrinsic depairing density Jb(T)J_b(T) on nanoscales of few GB dislocations were measured for the first time. The observed temperature dependence of Jb(T)=Jb0(1T/Tc)2J_b(T)=J_{b0}(1-T/T_c)^2 indicates a significant order parameter suppression in current channels between GB dislocation cores.Comment: 5 pages 5 figures. Phys. Rev. Lett. (accepted

    Steuerrecht

    No full text

    Gestalttheoretische Entsendungserfolgsanalyse: Konzeption und Operationalisierung

    No full text
    corecore