Bifurcations and a chaos strip in states of long Josephson junctions

Stationary and nonstationary, in particular, chaotic states in long Josephs on junctions are investigated. Bifurcation lines on the parametric bias cur rent-external magnetic field plane are calculated. The chaos strip along th e bifurcation line is observed. It is shown that transitions between statio nary states are the transitions from metastable to stable states and that t he thermodynamical Gibbs potential of these stable states may be larger tha n for some metastable states. The definition of a dynamical critical magnet ic field characterizing the stability of the stationary states is given. (C ) 1999 American Institute of Physics. [S1063-777X(99)01007-5].