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

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.

17 pages, 5 figures Revised version; final version

References in corpus (3)

• Experimental Generation and Observation of Intrinsic Localized Spin Wave Modes in an Antiferromagnet
• Generation of Intrinsic Vibrational Gap Modes in Three-Dimensional Ionic Crystals
• Optical creation of vibrational intrinsic localized modes in anharmonic lattices with realistic interatomic potentials

Cited by in corpus (18)

• Intrinsic localized mode and low thermal conductivity of PbSe
• Thermal Energy Transport in Oxide Nuclear Fuel
• Properties of discrete breathers in graphane from ab initio simulations
• Impact of intrinsic localized modes of atomic motion on materials properties
• Lattice dynamics reveals a local symmetry breaking in the emergent dipole phase of PbTe
• Energy transfer in strained graphene assisted by discrete breathers excited by external ac driving
• Thermally populated intrinsic localized modes in pure alkali halide crystals
• Effect of discrete breathers on the specific heat of a nonlinear chain
• Effect of discrete breathers on macroscopic properties of the Fermi-Pasta-Ulam chain
• Photoinduced ultrafast transition of the local correlated structure in chalcogenide phase-change materials
• Experimental and numerical observation of dark and bright discrete solitons in the band-gap of a diatomic-like electrical lattice
• Wavelet imaging of transient energy localization in nonlinear systems at thermal equilibrium: the case study of NaI crystals at high temperature
• Percolation in the classical blockmodel
• Discrete Breathers in a Realistic Coarse-Grained Model of Proteins
• Energy thresholds of discrete breathers in thermal equilibrium and relaxation processes
• Discrete breathers in ${\varphi }^4$ and related models
• Prediction and Observation of Intermodulation Sidebands from Anharmonic Phonons
• Quasi-stable Localized Excitations in the β-Fermi Pasta Ulam Tsingou System