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Inelastic neutron scattering study of phonon dispersion relation in higher manganese silicides

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.3390/cryst13050741
AuthorSearch for: ; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-2631-0010; Search for: 1; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-1172-8895
Affiliation
  1. National Research Council Canada. Security and Disruptive Technologies
FunderSearch for: Collaborative Research and Training Experience (CREATE) program; Search for: Discovery Grant; Search for: Program of Energy Research and Development
FormatText, Article
Subjectinelastic neutron scattering; thermoelectric materials; higher manganese silicide; phonon dispersion relation
Abstract
We report inelastic neutron scattering (INS) measurements of the phonon dispersion relation in higher manganese silicides (HMSs). A large ingot of HMS is synthesized using a slow cooling method, which is found to have Mn₁₅Si₂₆ as the primary phase. The sample is composed of highly oriented crystallites as confirmed by a neutron pole-figure study and thermal conductivity data. Our INS results are mostly consistent with earlier experimental and theoretical phonon studies in HMS, including the presence of a low-lying twisting mode. However, some discrepancies are also observed. Most notably, a 5 meV gap at the zone center and the softer dispersion relation of the low-lying twisting mode. We discuss the potential origins of these observations and their implications for the thermal properties of HMS.
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PublisherMDPI
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  • Crystals 13, no. 5, 741 (28 April 2023).
LanguageEnglish
Peer reviewedYes
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Record identifier2bdff942-a5c2-422f-8e59-0bbf24e8cebf
Record created2024-04-11
Record modified2024-04-11
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