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Anomalous transverse optical phonons in SnTe and PbTe

Li, Zehua; Li, Shasha; Castellan, John-Paul; Heid, Rolf; Xiao, Yu; Zhao, Li-Dong; Chen, Yue; Weber, Frank ORCID iD icon

Abstract (englisch):

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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Originalveröffentlichung
DOI: 10.1103/PhysRevB.105.014308
Scopus
Zitationen: 9
Web of Science
Zitationen: 8
Dimensions
Zitationen: 9
Zugehörige Institution(en) am KIT Institut für QuantenMaterialien und Technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 18.01.2022
Sprache Englisch
Identifikator ISSN: 2469-9950, 2469-9969
KITopen-ID: 1000142145
HGF-Programm 47.11.02 (POF IV, LK 01) Emergent Quantum Phenomena
Erschienen in Physical Review B
Verlag American Physical Society (APS)
Band 105
Heft 1
Seiten 014308-1 - 014308-8
Vorab online veröffentlicht am 03.01.2022
Nachgewiesen in Dimensions
Scopus
Web of Science
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