Ordering phenomena of high-spin/low-spin states in stepwise spin-crossover materials described by the ANNNI model - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2016

Ordering phenomena of high-spin/low-spin states in stepwise spin-crossover materials described by the ANNNI model

Résumé

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.
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Dates et versions

hal-01255817 , version 1 (15-01-2021)

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Hiroshi Watanabe, Koichiro Tanaka, Nicolas Bréfuel, Hervé Cailleau, Jean-François Létard, et al.. Ordering phenomena of high-spin/low-spin states in stepwise spin-crossover materials described by the ANNNI model. Physical Review B, 2016, 93 (1), pp.014419. ⟨10.1103/PhysRevB.93.014419⟩. ⟨hal-01255817⟩
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