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

M. E. Manley, A. J. Sievers, J. W. Lynn, S. A. Kiselev, N. I. Agladze, Y. Chen, A. Llobet, and A. Alatas
Phys. Rev. B 79, 134304 – Published 22 April 2009
Physics logo See Synopsis: Solitons in an ionic crystal

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.

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  • Received 18 February 2009

DOI:https://doi.org/10.1103/PhysRevB.79.134304

©2009 American Physical Society

Synopsis

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Solitons in an ionic crystal

Published 4 May 2009

Neutron scattering measurements indicate that intrinsic localized modes are found in thermal equilibrium in NaI, a simple ionic crystal.

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Authors & Affiliations

M. E. Manley1, A. J. Sievers2, J. W. Lynn3, S. A. Kiselev2, N. I. Agladze2, Y. Chen3,4, A. Llobet5, and A. Alatas6

  • 1Lawrence Livermore National Laboratory, Livermore, California 94551, USA
  • 2Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853-2501, USA
  • 3NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
  • 5Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 6Argonne National Laboratory, Argonne, Illinois 60439, USA

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Issue

Vol. 79, Iss. 13 — 1 April 2009

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