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This content will become publicly available on January 15, 2019

Title: Liquid-like thermal conduction in intercalated layered crystalline solids

As a generic property, all substances transfer heat through microscopic collisions of constituent particles. A solid conducts heat through both transverse and longitudinal acoustic phonons, but a liquid employs only longitudinal vibrations. As a result, a solid is usually thermally more conductive than a liquid. In canonical viewpoints, such a difference also serves as the dynamic signature distinguishing a solid from a liquid. Here in this work, we report liquid-like thermal conduction observed in the crystalline AgCrSe 2. The transverse acoustic phonons are completely suppressed by the ultrafast dynamic disorder while the longitudinal acoustic phonons are strongly scattered but survive, and are thus responsible for the intrinsically ultralow thermal conductivity. This scenario is applicable to a wide variety of layered compounds with heavy intercalants in the van der Waals gaps, manifesting a broad implication on suppressing thermal conduction. Finally, these microscopic insights might reshape the fundamental understanding on thermal transport properties of matter and open up a general opportunity to optimize performances of thermoelectrics.
Authors:
 [1] ; ORCiD logo [2] ;  [1] ; ORCiD logo [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [1] ;  [1] ;  [8] ;  [9] ;  [5] ;  [6] ;  [3] ;  [2] ;  [1] ;  [10]
  1. Japan Atomic Energy Agency, Tokai, Ibaraki (Japan). J-PARC Center
  2. Univ. of California, Irvine, CA (United States). Department of Physics and Astronomy
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States). Department of Physics and Astronomy
  4. Julich Center for Neutron Science, Forschungszentrum Julich GmbH (Germany)
  5. Univ. of Hong Kong (China). Department of Mechanical Engineering
  6. Southern University of Science and Technology (SUSTech), Shenzhen (China). Department of Physics
  7. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo (Japan). SPring-8
  8. Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki (Japan). Neutron Science and Technology Center
  9. Hebei University, Baoding (China). Hebei Key Lab of Optic-electronic Information and Materials, The College of Physics Science and Technology
  10. Northwestern Univ., Evanston, IL (United States). Department of Chemistry
Publication Date:
Report Number(s):
IS-J-9604
Journal ID: ISSN 1476-1122; PII: 4
Grant/Contract Number:
AC02-07CH11358; FG02-05ER46237
Type:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 17; Journal Issue: 3; Journal ID: ISSN 1476-1122
Publisher:
Nature Publishing Group
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Solid-state chemistry; Structure of solids and liquids; Thermoelectrics
OSTI Identifier:
1427732