Diluted Random Fields in Mixed Cyanide Crystals
arXiv:cond-mat/9702133 · doi:10.1209/epl/i1997-00199-0
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 x_c at which ferroelastic first order transitions disappear, are calculated. Moreover, transitions are found to remain first order down to x_c for all mixtures except for bromine, for which the transition becomes continuous. All the results are in full agreement with experimental data.
8 pages, latex