VARRET, François; BOUKHEDDADEN, Kamel; CHASTANET, Guillaume; PARADIS, Nicolas; LÉTARD, Jean-François

doi:10.1002/ejic.201200863

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VARRET, François
Groupe d'Etude de la Matière Condensée [GEMAC]

BOUKHEDDADEN, Kamel
Groupe d'Etude de la Matière Condensée [GEMAC]

CHASTANET, Guillaume
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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European Journal of Inorganic Chemistry. 2013 n° 5-6, p. 763-769

Wiley-VCH Verlag

Résumé en anglais

We used a macroscopic master equation for a two-level system, with simple assumptions, to calculate the kinetic behavior of a spin-crossover system when the equilibrium temperature interplays with the T(LIESST) temperature (LIESST = light-induced excited spin state trapping), that is, the thermal return temperature of the low-temperature metastable state of the system. The leading role of the unstable equilibrium branch is characterized through the crossing of the cooperative energy barrier, which induces a bifurcation of the response of the system in the strongly cooperative case. The results are shown in terms of a kinetic phase diagram, which shows the eventual discontinuities that result from the bifurcation effect. The present study suggests an experimental method for locating the unstable equilibrium branch of the thermal hysteresis, which enables determination of the equilibrium temperature of the hysteretic system, and which is not accessible by usual static measurements.< Réduire

Mots clés en anglais

Spin crossover

Metastable states

Theoretical approach

LIESST

Phase diagrams

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When T(LIESST) meets thermal hysteresis - a theoretical approach

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