Numerical study on structure of metastable states in prussian blue analogues and their dynamical aspects

Prussian blue analogues (PBAs) show the functionality due to the interesting combination of spin-crossover phase transitions and magnetic ordering under photoirradiation. In order to understand the dynamics of the system, it is necessary to clarify the structure of metastable state. We study this structure from a viewpoint of degeneracy changes due to charge transfer between the cobalt and iron ions accompanying the spin-crossover transition. The existence of metastable ferrimagnetic state is found at low temperature which is lower than the hysteresis region of the spin-crossover phase transition. This fact well explains the existence of metastable structure at low temperature in experiments. Properties of PBAs in magnetic fields and dynamics in oscillating magnetic field are also studied.