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The possibility of thermal excitation of intrinsic localized modes (ILMs)arising from anharmonicity in ionic perfect crystals is studied numerically forrealistic model systems in one and three dimensions. Implications are discussedfor an interesting high-temperature feature seen in earlier inelastic neutronscattering experiments on single crystal NaI. The general conclusion is thatILM formation energies are far too large for thermal excitation of ILMs toaccount for the observed feature in a pure crystal.

Thermally populated intrinsic localized modes in pure alkali halide crystals