Publications [#319444] of Olivier Delaire

Papers Published
  1. Li, CW; Hellman, O; Ma, J; May, AF; Cao, HB; Chen, X; Christianson, AD; Ehlers, G; Singh, DJ; Sales, BC; Delaire, O, Phonon self-energy and origin of anomalous neutron scattering spectra in SnTe and PbTe thermoelectrics., Physical Review Letters, vol. 112 no. 17 (May, 2014), pp. 175501 [doi] .

    Abstract:
    The anharmonic lattice dynamics of rock-salt thermoelectric compounds SnTe and PbTe are investigated with inelastic neutron scattering (INS) and first-principles calculations. The experiments show that, surprisingly, although SnTe is closer to the ferroelectric instability, phonon spectra in PbTe exhibit a more anharmonic character. This behavior is reproduced in first-principles calculations of the temperature-dependent phonon self-energy. Our simulations reveal how the nesting of phonon dispersions induces prominent features in the self-energy, which account for the measured INS spectra and their temperature dependence. We establish that the phase space for three-phonon scattering processes, combined with the proximity to the lattice instability, is the mechanism determining the complex spectrum of the transverse-optic ferroelectric mode.