Crossref journal-article
AIP Publishing
Applied Physics Letters (317)
Abstract

The Cahill-Pohl/Einstein model of minimum phonon thermal conductivity (κmin), which assumes isotropic material properties, is widely successful as the lower limit for fully dense amorphous and disordered materials. However, measurements of disordered highly anisotropic layered WSe2 [Chiritescu et al., Science 315, 351 (2007)] fall below the isotropic κmin limit by at least a factor of four. Here, we generalize the isotropic κmin to be anisotropic, suitable for both layered and chain-like materials with any anisotropy ratio. We obtain compact algebraic expressions in limiting temperature regimes for heat transfer along both c-axis (κmin−c) and ab-plane (κmin−ab). Applying this framework to the disordered layered WSe2 with no free parameters brings the theoretical κmin−c back in line with the experimental results. The anisotropic corrections result from both a phonon focusing effect and a first Brillouin zone truncation effect.

Bibliography

Chen, Z., & Dames, C. (2015). An anisotropic model for the minimum thermal conductivity. Applied Physics Letters, 107(19).

Authors 2
  1. Zhen Chen (first)
  2. Chris Dames (additional)
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Dates
Type When
Created 9 years, 9 months ago (Nov. 10, 2015, 1 p.m.)
Deposited 2 years, 2 months ago (June 17, 2023, 4:08 p.m.)
Indexed 3 weeks, 1 day ago (July 30, 2025, 7:04 a.m.)
Issued 9 years, 9 months ago (Nov. 9, 2015)
Published 9 years, 9 months ago (Nov. 9, 2015)
Published Online 9 years, 9 months ago (Nov. 9, 2015)
Published Print 9 years, 9 months ago (Nov. 9, 2015)
Funders 1
  1. Army Research Office 10.13039/100000183

    Region: Americas

    gov (National government)

    Labels5
    1. U.S. Army Research Office
    2. United States Army Research Office
    3. U.S. Army Research Laboratory's Army Research Office
    4. ARL's Army Research Office
    5. ARO

@article{Chen_2015, title={An anisotropic model for the minimum thermal conductivity}, volume={107}, ISSN={1077-3118}, url={http://dx.doi.org/10.1063/1.4935467}, DOI={10.1063/1.4935467}, number={19}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Chen, Zhen and Dames, Chris}, year={2015}, month=nov }