Two-variable macroscopic model for spin-crossover solids: Static and dynamic effects of the correlations |
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Authors: | B. Hôo K. Boukheddaden F. Varret |
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Affiliation: | (1) Laboratoire de Magnétisme et d'Optique, Université de Versailles (UMR 8634 du CNRS), 45 avenue des états-Unis, 78035 Versailles Cedex, France, FR |
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Abstract: | In order to investigate the role of nearest neighbors correlations in the relaxation of the High Spin fraction in spin crossover compounds, we have developed a two macro-variable dynamical model based on Kubo's treatement of the master equation. This is compared to the local equilibrium approach, where short-range correlations are assumed to follow adiabatically the long range-order parameter. The sigmoidal shape of the relaxation, previously associated with the effects of interactions, and the so-called “tail effect”, i.e. the extra-slowing down at long times due to the correlations are obtained. The accurate comparison to experimental relaxation data confirms the coexistence of short-range and long-range interactions in spin-crossover solids. Received 20 April 2000 |
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Keywords: | PACS. 64.60.-i General studies of phase transition - 05.70.Ln Nonequilibrium and irreversible thermodynamics - 05.50.+q Lattice theory and statistics (Ising Potts etc.) |
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