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Title: Twisting phonons in complex crystals with quasi-one-dimensional substructures [Twisting Phonons in Higher Manganese Silicides with a Complex Nowotny Chimney Ladder Structure]

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms7723· OSTI ID:1214462
 [1];  [1];  [1];  [1];  [2];  [2];  [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Texas, Austin, TX (United States)

A variety of crystals contain quasi-one-dimensional substructures, which yield distinctive electronic, spintronic, optical and thermoelectric properties. There is a lack of understanding of the lattice dynamics that influences the properties of such complex crystals. Here we employ inelastic neutron scatting measurements and density functional theory calculations to show that numerous low-energy optical vibrational modes exist in higher manganese silicides, an example of such crystals. These optical modes, including unusually low-frequency twisting motions of the Si ladders inside the Mn chimneys, provide a large phase space for scattering acoustic phonons. A hybrid phonon and diffuson model is proposed to explain the low and anisotropic thermal conductivity of higher manganese silicides and to evaluate nanostructuring as an approach to further suppress the thermal conductivity and enhance the thermoelectric energy conversion efficiency. This discovery offers new insights into the structure-property relationships of a broad class of materials with quasi-one-dimensional substructures for various applications.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1214462
Journal Information:
Nature Communications, Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 66 works
Citation information provided by
Web of Science

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Cited By (15)

Compromise and Synergy in High-Efficiency Thermoelectric Materials journal March 2017
Manipulation of Phonon Transport in Thermoelectrics journal February 2018
Enhancing the Figure of Merit of Heavy-Band Thermoelectric Materials Through Hierarchical Phonon Scattering journal March 2016
MnS Incorporation into Higher Manganese Silicide Yields a Green Thermoelectric Composite with High Performance/Price Ratio journal July 2018
Selective synthesis of higher manganese silicides: a new Mn17Si30 phase, its electronic, transport, and optical properties in comparison with Mn4Si7 journal February 2018
Optical parameters of gallium nitride doped ferrite–polypyrrole nanocomposites journal January 2020
Unified theory of thermal transport in crystals and glasses journal May 2019
Significant enhancement in thermoelectric performance of nanostructured higher manganese silicides synthesized employing a melt spinning technique journal January 2018
Anisotropic lattice thermal conductivity in chiral tellurium from first principles journal December 2015
Thermoactivated heat transfer mechanism in molecular crystals: Thermal conductivity of benzophenone single crystals journal January 2019
Effects of metal silicide inclusion interface and shape on thermal transport in silicon nanocomposites journal July 2019
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Eco-friendly high-performance silicide thermoelectric materials journal February 2017
Glass-like thermal conductivity in nanostructures of a complex anisotropic crystal journal December 2017
Crystal Structure and Thermoelectric Properties of Lightly Substituted Higher Manganese Silicides journal May 2018

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