VORTEX LATTICE STRUCTURE AND JOSEPHSON PLASMA IN HIGH T-C SUPERCONDUCTORS

The nature of the Josephson vortices induced by an external magnetic f ield applied parallel to the CuO2 layers in a high T-c superconductor end it of the Josephson plasma in the presence of the vortices are the oretically investigated. The ordered structure of the vortices is obta ined by solving the nonlinear differential equation for the interlayer phase difference in a stacked system of Josephson junctions. The curr ent distribution in the Josephson vortex is highly anisotropic and the vortices are arranged in straight chains, dissimilar to hexagonal lat tices of Abrikosov and pancake vortices. The appearance of the chain s tructure in the system is also confirmed by a Monte Carlo simulation. The Josephson plasma is a coupled oscillation of the phase difference between the layers and of the electromagnetic field. The vortices modi fy the phase difference and thus strongly influence the Josephson plas ma oscillation. Therefore, tie dispersion spectra of the longitudinal and transverse plasma waves in the presence of the vortices are strong ly dependent on the strength of an external magnetic field and tempera ture.