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Reduced phase space of heat-carrying acoustic phonons in single-crystalline InTe
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SYSNO ASEP 0542097 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Reduced phase space of heat-carrying acoustic phonons in single-crystalline InTe Author(s) Misra, S. (FR)
Barreteau, C. (FR)
Crivello, J.C. (FR)
Giordano, V.M. (FR)
Castellan, J.P. (FR)
Sidis, Y. (FR)
Levinský, Petr (FZU-D) RID, ORCID
Hejtmánek, Jiří (FZU-D) RID, ORCID
Malaman, B. (FR)
Dauscher, A. (FR)
Lenoir, B. (FR)
Candolfi, C. (FR)
Pailhes, S. (FR)Number of authors 13 Article number 043371 Source Title Physical Review Research. - : American Physical Society
Roč. 2, č. 4 (2020)Number of pages 17 s. Language eng - English Country US - United States Keywords thermal-conductivity ; thermoelectrics ; inelastic neutron scattering ; InTe single crystal Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000605502200010 EID SCOPUS 85104628664 DOI 10.1103/PhysRevResearch.2.043371 Annotation Chalcogenide semiconductors and semimetals are a fertile class of efficient thermoelectric materials, which, in most cases, exhibit very low lattice thermal conductivity κph despite lacking a complex crystal structure such as the tetragonal binary compound InTe. Our measurements of κph(T) in single-crystalline InTe along the c axis show that κph exhibits a smooth temperature dependence upon cooling to about 50 K, the temperature below which a strong rise typical for dielectric compounds is observed. Using a combination of first-principles calculations, inelastic neutron scattering (INS), and low-temperature specific heat and transport properties measurements on single-crystalline InTe, we show that the phonon spectrum exhibits well-defined acoustic modes, the energy dispersions of which are constrained to low energies due to distributions of dispersionless, optical modes, which are responsible for a broad double peak structure in the low-temperature specific heat.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2022 Electronic address http://hdl.handle.net/11104/0319591
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