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Title: The curious case of cuprous chloride: Giant thermal resistance and anharmonic quasiparticle spectra driven by dispersion nesting

Journal Article · · Physical Review B
ORCiD logo [1];  [1];  [2];  [3];  [3];  [4]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Duke Univ., Durham, NC (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of Missouri, Columbia, MO (United States)

Strongly anharmonic phonon properties of CuCl are investigated with a combination of first-principles simulations and inelastic neutron scattering measurements. An unusual quasiparticle peak in the spectral functions emerges with increasing temperature, in both simulations and measurements, emanating from exceptionally strong coupling between conventional phonon modes. Associated with this strong anharmonicity, the lattice thermal conductivity (κ) of CuCl is extremely low and exhibits anomalous, non-monotonic pressure dependence. We show how this behavior arises from nested phonon dispersions augmenting the phase space available for anharmonic three-phonon scattering processes, and contrast this mechanism with common arguments based on negative Grüneisen parameters. Here, these results demonstrate the importance of considering the topology of phonon dispersions toward understanding phonon scattering processes and designing new ultralow thermal conductivity materials for technological applications.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; SC0014607; AC05-00OR22725
OSTI ID:
1476537
Alternate ID(s):
OSTI ID: 1378399; OSTI ID: 1408035
Journal Information:
Physical Review B, Vol. 96, Issue 10; Related Information: © 2017 American Physical Society.; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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