Dynamical process for switching dynamics between metastable ordered   magnetic state and nonmagnetic ground state in photoinduced phase transition
  We propose a dynamical mechanism of the two-way switching between the metastable state and the stable state, which has been found in experiments of photoinduced reversible magnetization and photoinduced structural phase transition. We find that the two-way switching with a non-symmetry breaking perturbation such as illumination is possible only in systems with appropriate parameters. We make it clear that the existence of two time scales in the dynamical process is important for the two-way switching. 
Masamichi Nishino and Seiji Miyashita