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Phonon Lifetime Observation in Epitaxial ScN Film with Inelastic X-Ray Scattering Spectroscopy.

H Uchiyama1, Y Oshima2, R Patterson3

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Understanding phonon scattering in nonmetallic materials is key for device performance. This study experimentally observed phonon dispersion and lifetimes in ScN films, revealing short lifetimes due to three-body interactions.

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Area of Science:

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

Background:

  • Phonon-phonon scattering governs thermal properties in nonmetallic materials, impacting device performance.
  • Computational methods have advanced scattering understanding, but direct observation of phonon modes with momentum dependence is needed.

Purpose of the Study:

  • To experimentally measure phonon dispersion curves and lifetimes in epitaxially grown ScN films.
  • To investigate the momentum dependence of optical phonon lifetimes.
  • To compare experimental findings with first-principles calculations.

Main Methods:

  • Inelastic X-ray Scattering (IXS) measurements were performed on an epitaxially grown ScN film.
  • Phonon dispersion curves were determined.
  • Phonon lifetimes were estimated from the spectral width, analyzing momentum dependence.

Main Results:

  • Experimental data on phonon dispersion and lifetimes in ScN films were obtained.
  • The highest-energy optical phonon mode near the zone center exhibited a short lifetime of 0.21 picoseconds.
  • Momentum dependence of optical phonon lifetimes was successfully estimated.

Conclusions:

  • The experimental results for phonon lifetimes in ScN films are quantitatively consistent with theoretical predictions.
  • Three-body phonon-phonon interactions are identified as the primary mechanism responsible for the observed short phonon lifetimes.