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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Phonon-lifetimes in demixing systems.

J Davaasambuu1, F Güthoff, M Petri

  • 1Institute for Physical Chemistry, Georg-August-University of Göttingen, Tammannstrasse 6, D37077 Göttingen, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 29, 2012
PubMed
Summary
This summary is machine-generated.

Silver-alkali halide mixed crystals showed significant changes in phonon dynamics during spinodal decomposition. Phonon lifetimes increased during coarsening, with zone-boundary modes damping below 10 nm precipitate size.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Understanding the dynamics of mixed single crystals is crucial for materials science.
  • Spinodal decomposition in silver-alkali halide systems involves complex structural changes.
  • Previous studies focused on acoustic phonons, leaving zone-boundary modes less explored.

Purpose of the Study:

  • To investigate the real-time dynamics of Brillouin-zone boundary modes during spinodal decomposition in Ag(x)Na(1-x)Br.
  • To correlate phonon behavior with local structural variations during phase separation.
  • To determine the mean free path of zone-boundary modes in relation to precipitate size.

Main Methods:

  • Inelastic neutron scattering experiments were performed using the PUMA and IN5 spectrometers.
  • Time-resolved, stroboscopic measurements captured the time evolution of phonons.
  • A dynamical model based on local structure variants was employed for interpretation.

Main Results:

  • Phonon lifetimes exhibited strong variations during phase separation and increased significantly during coarsening.
  • Zone-boundary modes were heavily damped for precipitates up to approximately 10 nm.
  • Beyond 10 nm, phonon line widths narrowed to the experimental resolution, indicating reduced damping.

Conclusions:

  • The study reveals a strong dependence of phonon lifetimes on the coarsening process in mixed crystals.
  • The mean free path of Brillouin-zone boundary modes was determined to be approximately 10 nm (20 unit cells).
  • These findings provide insights into the relationship between local structure, phonon dynamics, and phase separation in materials.