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Title: Collective-Goldstone-mode-induced ultralow lattice thermal conductivity in Sn-filled skutterudite SnFe 4 Sb 12

Here, we demonstrate that the concept of Goldstone bosons can be exploited for phonon control and thermal conductivity reduction of materials. By studying lattice dynamics of the Sn filled skutterudite SnFe 4Sb 12, we find Sn off-centers in its coordination cage in contrast to the common rare earth fillers. This leads to low-frequency Goldstone-like modes below 1 THz associated mainly with Sn motions. Importantly, these involve collective motion of other atoms, especially Sb, in the host skutterudite lattice. The optical modes transversing to the Sn off-centering direction are identified as Goldstone type modes in association with a three-dimensional Mexican-hat-like potential energy surface. The interaction of these collective Goldstone modes with the host heat-carrying phonons is shown to lead to ultralow lattice thermal conductivity.
Authors:
 [1] ;  [2] ;  [2] ;  [3]
  1. Jilin Univ., Changchun (China). State Key Lab. of Superhard Materials, Key Lab. of Automobile Materials of MOE, and College of Materials Science and Engineering; Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
  2. Jilin Univ., Changchun (China). State Key Lab. of Superhard Materials, Key Lab. of Automobile Materials of MOE, and College of Materials Science and Engineering
  3. Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
SC0001299; FG02-09ER46577
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Univ. of Missouri, Columbia, MO (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Phonons; Bonding; Lattice thermal conductivity
OSTI Identifier:
1415615
Alternate Identifier(s):
OSTI ID: 1415534