Organized by the Institute of Experimental Physics, University of Bialystok and the Institute of Atomic Energy, Swierk under the auspices of the European Crystallographic Association; Committee of Crystallography, the Polish Academy of Sciences; and the Polish Neutron Scattering Society The School is financially supported in part by the International Union of Crystallography; the European Crystallographic Association; the European Office of Aerospace Research & Development; the Ministry of Science and Information Society Technologies; the Warsaw University of Technology; and the University of Bialystok.
		Dynamical properties of Photoinduced Magnetism and Spin-Crossover phenomena in Prussian Blue Analogs Masamichi Nishino*, Kamel Boukheddaden#, Seiji Miyashita&, and Francois Varret# * Computational Materials Science Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan # Laboratoire de Magnetisme et d'Optique, CNRS-Universite de Versailles/St. Quentin en Yvelines, 45 Avenue des Etats Unis, F78035 Versailles Cedex, France and Department of Physics, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo, Japan Topics We study dynamical properties of spincrossover compounds with photoinduced magnetization. In particular, we focus on the annealing processes with different temperature cycles which have been studied in the experiments of Prussian blue analogs. We investigate the time evolution of the magnetization and high spin fraction of the system, proposing a new model which allows us to describe both spincrossover (SC) and magnetic properties of Prussian blue analogs under photoirradiation. Both the intermolecular lattice interaction and the intermolecular magnetic interaction are considered in this model, which enables unified descriptions of the past studies of the photoinduced SC transiton and magnetic transitions. For the dynamics of the system, we take into account the multi-time scales in a master equation approach for the magnetic relaxation, the lattice (electronic) relaxation, and the photoexcitation process. The magnetization and spin states exhibit various types of dynamical cooperative phenomena under time-dependent control of environments, which reproduce qualitatively well the novel behaviour observed in the experiments. We also discuss the mechanism of the multi-functional phenomena with magnetic and SC transitions.