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Phys Rev Lett. 2009 Jul 10;103(2):028301. Epub 2009 Jul 10.

Successive dynamical steps of photoinduced switching of a molecular Fe(III) spin-crossover material by time-resolved x-ray diffraction.

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Institut de Physique de Rennes, Université de Rennes 1-CNRS, UMR 6251, 35042 Rennes, France.


We investigate the out-of-equilibrium switching dynamics of a molecular Fe(III) spin-crossover solid triggered by a femtosecond laser flash. The time-resolved x-ray diffraction and optical results show that the dynamics span from subpicosecond local photoswitching followed by volume expansion (nanosecond) and thermal switching (microsecond). We present a physical picture of the consecutive steps in the photoswitching of molecular materials.

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