Volume 96, Number 1, October 2011
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||15 September 2011|
Dynamical separation of spin and lattice degrees of freedom in the relaxation process from the photo-induced state
Department of Physics, Graduate School of Science, Kyoto University - Sakyo-ku, Kyoto 606-8502, Japan
2 Institut de Physique de Rennes, UMR CNRS 6251, Université Rennes 1 - 263 av. Général Leclerc, 35042 Rennes, France, EU
3 Laboratoire de Chimie de Coordination du CNRS, UPR 8241 - 205 Route de Narbonne, 31077 Toulouse 04, France, EU
4 Institute for Integrated Cell-Material Sciences, Kyoto University - Sakyo-ku, Kyoto 606-8501, Japan
Accepted: 16 August 2011
We have studied the relaxation dynamics from the photo-induced state in the spin crossover complex [FeH2L2-Me](ClO4)2 by magnetic susceptibility and X-ray diffraction measurements. Just after turning off the laser irradiation, the photo-induced high-spin state immediately starts relaxing back to the low-spin state, while the crystal lattice shows a nucleation process. This result shows that the spin state and lattice deformation should be treated as individual parameters in the non-equilibrium phase transition from the photo-induced state. Experimental results are qualitatively explained by the two-sublattice Ising-like model.
PACS: 75.30.Wx – Spin crossover / 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 05.70.Ln – Nonequilibrium and irreversible thermodynamics
© EPLA, 2011
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