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Search: WFRF:(Delaire O.)

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  • Li, C.W., et al. (author)
  • Phonon Self-Energy and Origin of Anomalous Neutron Scattering Spectra in SnTe and PbTe Thermoelectrics
  • 2014
  • In: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 112:17, s. 175501-
  • Journal article (peer-reviewed)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.
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Type of publication
journal article (1)
Type of content
peer-reviewed (1)
Author/Editor
Chen, X. (1)
Hellman, Olle (1)
Ma, J (1)
Ehlers, G. (1)
Singh, D. J. (1)
Li, C.W. (1)
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May, A.F. (1)
Cao, H.B. (1)
Christianson, A.D. (1)
Sales, B.C. (1)
Delaire, O. (1)
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University
Linköping University (1)
Language
English (1)
Year
2014 (1)

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