BURON-LE COINTE, Marylise; HEBERT, Johan; BALDÉ, Cherif; MOISAN, Nicolas; TOUPET, Loïc; GUIONNEAU, Philippe; LETARD, Jean-François; FREYSZ, Eric; CAILLEAU, Hervé; COLLET, Eric

doi:10.1103/PhysRevB.85.064114

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BURON-LE COINTE, Marylise
Institut de Physique de Rennes [IPR]

HEBERT, Johan
Institut de Physique de Rennes [IPR]

BALDÉ, Cherif
Institut de Physique de Rennes [IPR]
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). 2012-02-01, vol. 85, n° 6, p. 064114 (9 p.)

American Physical Society

Résumé en anglais

We discuss here the important role of inter-molecular coupling for the thermal and lightinduced molecular state switching in the solid state. Investigations were performed on the two crystalline polymorphs of the spin crossover [Fe(PM BiA)2(NCS)2] material. In addition to structural studies at thermal equilibrium, light-induced phenomena were investigated through photo-crystallography, photo-magnetic and dynamical optical measurements. Strong similarities between the thermal-equilibrium and the out-ofequilibrium light-induced transformations are observed in each polymorph: strong cooperative phenomena in one polymorph versus weak cooperative ones in the second polymorph. These different responses of the two crystalline forms of the compound to external perturbations are discussed at the microscopic level in terms of Ising-like model and two-mode description of on-site molecular potentials.< Réduire

Mots clés en anglais

Molecular state

Solid state

Spin crossover

Crystallographic aspects of phase transformations

pressure effects

Nonequilibrium and irreversible thermodynamics

Relaxation effects

Switching phenomena

DOI

http://dx.doi.org/10.1103/PhysRevB.85.064114

Project ANR

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Importé de hal

Unités de recherche

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