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Journal Articles Journal de Physique I Year : 1992

Ising-like model for the two-step spin-crossover

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Abstract

We have analyzed an Ising-like model, in the mean-field approach, involving two “antiferromagnetically” coupled sublattices. This model simulates the so-called “two-step” spin-crossover transition, for which a precise definition is given. If both sublattices are equivalent, it implies a spontaneous breaking of symmetry which may occur within a temperature range limited by two “Néel températures”. It, also predicts a simultaneous reversal of the magnetization of the sublattices (if they are unequivalent) at a “characteristic” value of temperature. These features are analyzed simultaneously with some details. The present model fits and explains well the available experimental data concerning [ Fe(2-pic)3] Cℓ2- EtOH and FeII[ 5NO2 – sal – N(1, 4, 7, 10)] .
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Dates and versions

jpa-00246629 , version 1 (01-01-1992)

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Azzedine Bousseksou, J. Nasser, J. Linares, K. Boukheddaden, F. Varret. Ising-like model for the two-step spin-crossover. Journal de Physique I, 1992, 2 (7), pp.1381-1403. ⟨10.1051/jp1:1992217⟩. ⟨jpa-00246629⟩
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