Diluted Random Fields in Mixed Cyanide Crystals
Serge Galam
Abstract
A percolation argument and a dilute compressible random field Ising model are used to present a simple model for mixed cyanide crystals. The model reproduces quantitatively several features of the phase diagrams altough some crude approximations are made. In particular critical thresholds xc at which ferroelastic first order transitions disappear, are calculated. Moreover, transitions are found to remain first order down to xc for all mixtures except for bromine, for which the transition becomes continuous. All the results are in full agreement with experimental data.
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