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Phys Rev Lett. 2000 Apr 3;84(14):3181-4.

Dynamical aspects of the photoinduced phase transition in spin-crossover complexes

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Department of Condensed Matter Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan and Kanagawa Academy of Science and Technology (KAST), Sakado, Takatsu-ku, Kawasaki 213-0012, Japan.


We report a dynamical study on the photoinduced cooperative changes of the spin configurations in single crystals of the organometal spin-crossover complex. In the photoswitching process between low- and high-spin states, nonlinear characteristics such as thresholdlike behavior, incubation period, and phase separation have been observed. These results demonstrate that the cooperative intersystem crossing mediated by spin-lattice interaction plays a key role in the driving process of a new class of nonequilibrium phenomena so called photoinduced phase transition.

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