Intrinsic localized modes observed in the high-temperature vibrational spectrum of NaI
Intrinsic localized modes observed in the high-temperature vibrational spectrum of NaI
Inelastic neutron measurements of the high-temperature lattice excitations in NaI show that in thermal equilibrium at 555 K an intrinsic mode, localized in three dimensions, occurs at a single frequency near the center of the spectral phonon gap, polarized along [111]. At higher temperatures the intrinsic localized mode gains intensity. …