Existence of nonlinear rotating modes in intrinsic Josephson effects in high-T-c superconductors

Examining solutions to equations for the gauge-invariant phase difference of macroscopic superconducting wavefunctions and comparing them with experimental data for the I-V characteristics of the intrinsic Josephson effect in high-T-c superconductors, we show the concrete evidence for the existence of nonlinear rotating modes which are a kind of intrinsic nonlinear localized modes in pure nonlinear lattices.