Disorder recovers the Wiedemann-Franz law in the metallic phase of VO2

Jin, Lei; Zeltmann, Steven E.; Choe, Hwan Sung; Liu, Huili; Allen, Frances I.; Minor, Andrew M.; Wu, Junqiao

doi:10.1103/physrevb.102.041120

Disorder recovers the Wiedemann-Franz law in the metallic phase of VO₂

Journal Article · Wed Jul 22 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.041120· OSTI ID:1783109

Jin, Lei ^[1]; Zeltmann, Steven E. ^[2]; ^[1]; Liu, Huili ^[1]; ^[2]; Minor, Andrew M. ^[2]; ^[1]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Center for Electron Microscopy

At temperatures higher than 341 K, vanadium dioxide (VO₂) is a strongly correlated metal with resistivity exceeding the Mott-Ioffe-Regel limit. Its electronic thermal conductivity is lower than that predicted by the Wiedemann-Franz (WF) law, and can be explained by nonquasiparticle transport where heat and charge currents follow separate diffusive modes. In contradiction, the Wiedemann-Franz law is a direct consequence of quasiparticle transport where charge carriers are elastically scattered. In this work, we enhance elastic electron scattering in VO₂ by introducing atomic disorder with ion irradiation. Furthermore, a gradual and eventually full recovery of the WF law is observed at high defect densities. This observation provides an example that connects hydrodynamic quasiparticle transport to nonquasiparticle transport in metallic systems.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1783109

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 4 Vol. 102; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Disorder recovers the Wiedemann-Franz law in the metallic phase of VO2

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Disorder recovers the Wiedemann-Franz law in the metallic phase of VO₂