DIRECT NUMERICAL EXPERIMENTS FOR INTERLAYER JOSEPHSON PLASMA AND FLUCTUATION OF VORTICES IN LAYERED HIGH-T-C SUPERCONDUCTORS

We perform a direct numerical simulation solving the time-dependent Gi nzburg-Landau equation in the presence of both thermal and quenched st rong disorders (point pinning centers) in order to explain the tempera ture and magnetic field dependence of the collective Josephson plasma resonance frequency under the c-axis parallel magnetic field recently reported in highly anisotropic Bi2Sr2CaCu2O8 (Bi-2212). The temperatur e dependence of the plasma frequency omega(c)(T) similar to experiment al results, and omega(c)(2)(B) proportional to B-mu, mu approximate to 1 behavior observed in Bi-2212 are successfully obtained, and the rel ation between those behaviors and vortex states is clarified. (C) 1997 Elsevier Science B.V.