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.
- Received 18 February 2009
DOI:https://doi.org/10.1103/PhysRevB.79.134304
©2009 American Physical Society
Synopsis
Solitons in an ionic crystal
Published 4 May 2009
Neutron scattering measurements indicate that intrinsic localized modes are found in thermal equilibrium in , a simple ionic crystal.
See more in Physics