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    Three states and three steps simulated within Ising-like model solved by local mean field approximation in 3D spin crossover nanoparticles
    (Elsevier, 2021-03-01)
    Coordination iron (II) compounds are studied to simulate switching properties between low spin (LS, S = 0) and high-spin (HS, S = 2) states in spin-crossover materials. These two states are diamagnetic (LS) and paramagnetic (HS) in nature, and the switching between these two states is achieved through external excitations which may be of thermal or of pressure origin. In this contribution, a local mean-field approach is proposed to study SCO nano/micro-particles, for which distinctions among the contributions of molecules localized at the edge, corner, surface or the bulk, as well as for the external coupling that concerns only surface particles have been introduced. In this first attempt, the model is solved using a rough approximation which simplifies its treatment, leading to finding out three steps switching and three states, simulated under temperature effect while two steps transitions are obtained under pressure effect.
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    Hexagonal-shaped spin crossover nanoparticles studied by Ising-like model solved by local mean field approximation
    (MDPI AG, 2021-05-01)
    The properties of spin crossover (SCO) nanoparticles were studied for five 2D hexagonal lattice structures of increasing sizes embedded in a matrix, thus affecting the thermal properties of the SCO region. These effects were modeled using the Ising-like model in the framework of local mean field approximation (LMFA). The systematic combined effect of the different types of couplings, consisting of (i) bulk short-and long-range interactions and (ii) edge and corner interactions at the surface mediated by the matrix environment, were investigated by using parameter values typical of SCO complexes. Gradual two and three hysteretic transition curves from the LS to HS states were obtained. The results were interpreted in terms of the competition between the structure-dependent order and disorder temperatures (TO.D. ) of internal coupling origin and the ligand field-dependent equilibrium temperatures (Teq ) of external origin.