Decoherence and classical behavior with a chaotic macroscopic environment

Quantum state diffusion approach to open system dynamics is used to study decoherence and dynamics of the pointer observable of an angular momentum system in interaction with a macroscopic nonlinear and dissipative environment. It is shown that dispersion of the pointer observable in the mixed state of the open system is clearly larger if the environment is classically chaotic then in the case of the environment with regular dynamics.