Title: Fermi Surface Nesting and Phonon Frequency Gap Drive Anomalous Thermal Transport

Journal Article · · Physical Review Letters

The lattice thermal conductivity, kL, of typical metallic and nonmetallic crystals decreases rapidly with increasing temperature because phonons interact more strongly with other phonons than they do with electrons. Using first principles calculations, we show that kL can become nearly independent of temperature in metals that have nested Fermi surfaces and large frequency gaps between acoustic and optic phonons. Then, the interactions between phonons and electrons become much stronger than the mutual interactions between phonons, giving the fundamentally different kL behavior. This striking trend is revealed here in the group V transition metal carbides, vanadium carbide, niobium carbide, and tantalum carbide, and it should also occur in several other metal compounds. As a result, this work gives insights into the physics of heat conduction in solids and identifies a new heat flow regime driven by the interplay between Fermi surfaces and phonon dispersions.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1479763
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 121; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

First-principles calculations on the intrinsic resistivity of borophene: anisotropy and temperature dependence journal January 2019
Perspective on ab initio phonon thermal transport journal August 2019
Comprehensive first-principles analysis of phonon thermal conductivity and electron-phonon coupling in different metals journal October 2019
A comprehensive first-principles analysis of phonon thermal conductivity and electron-phonon coupling in different metals text January 2019

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