Vortex Lattice Structure and Josephson Plasma in High Tc Superconductors

M. Tachiki；S. E. Shafranjuk；X. Hu

Chinese Journal of Physics

36卷2S期（1998 / 04 / 01）

171 - 179

英文

The nature of the Josephson vortices induced by an external magnetic field applied parallel to the CuO2 layers in a high Tc superconductor end it ofthe Josephson plasma in the presence ofthe vortices are theoretically investigated. The ordered structure ofthe vortices is obtained by solving the nonlinear differential equation for the interlayer phase difference in a stacked system of Josephson junctions. The current distribution in the Josephson vortex is highly anisotropic and the vortices are arranged in straight chains, dissimilar to hexagonal lattices of Abrikosov and pancake vortices. The appearance of the chain structure in the system is also confirmedby 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 modify the phase difference and thus strongly influence the Josephson plasma oscillation. Therefore, the dispersion spectra of the longitudinal and transverse plasma waves in the presence of the vortices are strongly -dependent on the strength of an external magnetic field and temperature.