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Anomalously low electronic thermal conductivity in metallic vanadium dioxide

Journal Article · · Science
 [1];  [2];  [3];  [4];  [5];  [5];  [3];  [5];  [6];  [7];  [3];  [8];  [9];  [3]
  1. Univ. of California, Berkeley, CA (United States); Kyungpook National Univ., Daegu (South Korea)
  2. Univ. of California, Berkeley, CA (United States); A*STAR (Agency for Science, Technology and Research), Innovis (Singapore)
  3. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Beijing Institute of Technology, Beijing (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of California, Berkeley, CA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); King Abdulaziz Univ., Jeddah (Saudi Arabia)
  8. Stanford Univ., Stanford, CA (United States)
  9. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Duke Univ., Durham, NC (United States)
+ Show Author Affiliations
In electrically conductive solids, the Wiedemann-Franz law requires the electronic contribution to thermal conductivity to be proportional to electrical conductivity. Violations of the Wiedemann-Franz law are typically an indication of unconventional quasiparticle dynamics, such as inelastic scattering, or hydrodynamic collective motion of charge carriers, typically pronounced only at cryogenic temperatures. We report an order-of-magnitude breakdown of the Wiedemann-Franz law at high temperatures ranging from 240 to 340 kelvin in metallic vanadium dioxide in the vicinity of its metal-insulator transition. As a result, different from previously established mechanisms, the unusually low electronic thermal conductivity is a signature of the absence of quasiparticles in a strongly correlated electron fluid where heat and charge diffuse independently.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1351792
Journal Information:
Science, Journal Name: Science Journal Issue: 6323 Vol. 355; ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY