Intrinsic localized modes observed in the high-temperature vibrational spectrum of NaI

2008/10/31 by M. E. Manley, Michael E. Manley, A. J. Sievers +8 · 3 citations
Materials Science · Physics and Astronomy · #Advanced Fiber Laser Technologies #Nonlinear Photonic Systems #Organic and Molecular Conductors Research #cond-mat.str-el #nlin.PS

paper · pdf · doi:10.1103/physrevb.79.134304

published as Phys. Rev. B 79, 134304 (2009) · 17 pages, 5 figures Revised version; final version

openalex publication_date 2009/04/22 · arxiv created 2009/04/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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. Higher energy inelastic neutron and x-ray scattering measurements on a room-temperature NaI crystal indicate that the creation energy of the ground state of the intrinsic localized mode is 299 meV.

Citations

• Optical creation of vibrational intrinsic localized modes in anharmonic lattices with realistic interatomic potentials

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