Experimental evidence of strong phonon scattering in isotopical disordered systems: The case of LiH_xD_{1-x} crystals

TL;DR

This paper provides experimental evidence that isotope-induced disorder in LiH_xD_{1-x} crystals causes strong phonon scattering, affecting vibrational modes and phonon behavior.

Contribution

It demonstrates the impact of isotope disorder on phonon scattering and vibrational properties in LiH-D crystals through experimental observations.

Findings

Observation of local mode vibrations

Two-mode behavior of LO phonons at high isotope concentration

Significant line broadening indicating strong phonon scattering

Abstract

The observation of the local - mode vibration, the two - mode behavior of the LO phonons at large isotope concentration, as well as large line broadening in LIH - D mixed crystals directly evidence strong additional phonon scattering due to the isotope - induced disorder.