VIQUERAT, Benjamin; DEGERT, Jérôme; LÉTARD, Jean-François; FREYSZ, Eric

doi:10.1103/PhysRevB.87.024303

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VIQUERAT, Benjamin
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

DEGERT, Jérôme
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

LÉTARD, Jean-François
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Ce document a été publié dans

Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2013-01-01, vol. 87, n° 2, p. 024303 (1-6)

American Physical Society

Résumé en anglais

We performed an optical pump-probe experiment to monitor the laser-induced spin state transition of [Fe(PM-BiA)2(NCS)2] spin crossover microcrystallites. The sample is illuminated by a continuous-wave pump laser centered at λ = 976 nm that switches the compound from the low-spin to the high-spin state. When the pump laser is switched on or off, and above a given power threshold, the diffuse reflectivity of the sample increases or decreases, respectively, and presents characteristic damped oscillations that are not due to laser-induced excited spin state trapping. We propose a shell-core model that, due to the laser-induced heating and spin state transition of the microcrystallites, accounts very well for the reported observations.< Réduire

Mots clés en anglais

Nonequilibrium and irreversible thermodynamics

Heat conduction

Optical properties of bulk materials and thin films

DOI

http://dx.doi.org/10.1103/PhysRevB.87.024303

Project ANR

/ - ANR-09-BLAN-0212

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798