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Inelastic neutron measurements of the high-temperature lattice excitations inNaI show that in thermal equilibrium at 555 K an intrinsic mode, localized inthree dimensions, occurs at a single frequency near the center of the spectralphonon gap, polarized along [111]. At higher temperatures the intrinsiclocalized mode gains intensity. Higher energy inelastic neutron and x-rayscattering measurements on a room-temperature NaI crystal indicate that thecreation energy of the ground state of the intrinsic localized mode is 299 meV.

Intrinsic Localized Modes Observed in the High Temperature Vibrational Spectrum of NaI