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  Anomalous transverse optical phonons in SnTe and PbTe

Li, Z., Li, S., Castellan, J.-P., Heid, R., Xiao, Y., Zhao, L.-D., et al. (2022). Anomalous transverse optical phonons in SnTe and PbTe. Physical Review B, 105(1): 014308. doi:10.1103/PhysRevB.105.014308.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0009-E613-E Version Permalink: https://hdl.handle.net/21.11116/0000-000F-1C24-A
Genre: Journal Article

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 Creators:
Li, Zehua1, 2, Author           
Li, Shasha3, 4, Author
Castellan, John-Paul5, Author
Heid, Rolf1, Author
Xiao, Yu6, Author
Zhao, Li-Dong6, Author
Chen, Yue3, Author
Weber, Frank1, Author
Affiliations:
1Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany, ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
3Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China, ou_persistent22              
4School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China, ou_persistent22              
5Laboratoire Léon Brillouin (CEA-CNRS), CEA-Saclay, F-91911 Gif-sur-Yvette, France, ou_persistent22              
6School of Materials Science and Engineering, Beihang University, Beijing 100191, China, ou_persistent22              

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 Abstract: We present a study of the soft transverse optic phonon mode in SnTe in comparison to the corresponding mode in PbTe using inelastic neutron scattering and ab initio lattice dynamical calculations. In contrast to previous reports our calculations predict that the soft mode in SnTe features a strongly asymmetric spectral weight distribution qualitatively similar to that found in PbTe. Experimentally, we find that the overall width in energy of the phonon peaks is comparable in our neutron scattering spectra for SnTe and PbTe. We observe the well-known double-peaklike signature of the TO mode in PbTe even down to T=5K, questioning its proposed origin purely based on phonon-phonon scattering. The proximity to the incipient ferroelectric transition in PbTe likely plays an important role not included in current models.

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Language(s): eng - English
 Dates: 2021-12-222021-05-172022-01-032022-01-18
 Publication Status: Published online
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.105.014308
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: 8 Volume / Issue: 105 (1) Sequence Number: 014308 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008