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In many physical situations in which many-body assemblies exist at temperature T, a characteristic quantum-mechanical time scale of approximately h_bar∕kBT can be identified in both theory and experiment, leading to speculation that it may be the shortest meaningful time in such circumstances. This behavior can be investigated by probing the scattering rate of electrons in a broad class of materials often referred to as “strongly correlated metals”. It is clear that in some cases only electron-electron scattering can be its cause, while in others it arises from high-temperature scattering of electrons from quantized lattice vibrations, i.e., phonons. In metallic oxides, which are among the most studied materials, analysis of electrical transport does not satisfactorily identify the relevant scattering mechanism at “high” temperatures near room temperature. We therefore employ a contactless optical method to measure thermal diffusivity in two Ru-based layered perovskites, Sr3Ru2O7 and Sr2RuO4, and use the measurements to extract the dimensionless Lorenz ratio. By comparing our results to the literature data on both conventional and unconventional metals, we show how the analysis of high-temperature thermal transport can both give important insight into dominant scattering mechanisms and be offered as a stringent test of theories attempting to explain anomalous scattering.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: transport in strongly correlated metals, Lorenz ratio, thermal transport, electron–electron scattering

Date published: 2024-08-27

Publisher: Proceedings of the National Academy of Sciences

Journal:

• Proceedings of the National Academy of Sciences (ISSN: 10916490) vol. 121 issue. 35 e2318159121

Funding:

• University of California Berkeley the Miller Institute for Basic Research in Science
• Deutsche Forschungsgemeinschaft TRR 288 - 422213477 (project A10)
• Deutsche Forschungsgemeinschaft Cluster of Excellence ct.qmat (EXC 2147 project ID 390858940)
• MEXT | Japan Society for the Promotion of Science 18K04715 21H01033 22K19093

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1073/pnas.2318159121

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Updated at: 2024-08-30 16:30:57 +0900

Published on MDR: 2024-08-30 16:30:57 +0900