WATANABE, Hiroshi; TANAKA, Koichiro; BRÉFUEL, Nicolas; CAILLEAU, Hervé; LÉTARD, Jean-François; RAVY, Sylvain; FERTEY, Pierre; NISHINO, Masamichi; MIYASHITA, Seiji; COLLET, Eric

doi:10.1103/PhysRevB.93.014419

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WATANABE, Hiroshi
Institut de Physique de Rennes [IPR]

TANAKA, Koichiro
Institute for Integrated Cell-Material Sciences

BRÉFUEL, Nicolas
Observatoire des Micro et Nano Technologies [OMNT - UMS 2920]

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Ce document a été publié dans

Physical Review B. 2016-01-13, vol. 93, n° 1, p. 014419

American Physical Society

Résumé en anglais

We study the complex spin-state switching mechanism in a bistable molecular crystal undergoing a stepwise conversion from high-spin to low-spin states at thermal equilibrium as well as during the relaxation process from the photoinduced metastable state. We experimentally evidence that such steps are associated with complex types of long-range and short-range ordering phenomena, resulting from the occupational modulation of bistable molecular magnetic states. The conversion is then described by using two order parameters: the totally symmetric average high spin fraction and the symmetry breaking ordering parameter. The use of the anisotropic next-nearest-neighbor Ising (ANNNI) model allows us to describe the microscopic origin of the ordering, and Monte Carlo simulations reproduce the observed stepwise thermal phase transition as well as the stepwise relaxation from the photoinduced high-spin state to the low-spin state.< Réduire

DOI

http://dx.doi.org/10.1103/PhysRevB.93.014419

Project ANR

Etude femtoseconde rayons X et optique de la dynamique ultrarapide de photocommutation de matériaux moléculaires magnétiques - ANR-13-BS04-0002

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Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026