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  Mesoscopic finite-size effects of unconventional electron transport in PdCoO2

Varnavides, G., Wang, Y., Moll, P. J. W., Anikeeva, P., & Narang, P. (2022). Mesoscopic finite-size effects of unconventional electron transport in PdCoO2. Physical Review Materials, 6(4): 045002. doi:10.1103/PhysRevMaterials.6.045002.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000B-7548-1 Version Permalink: https://hdl.handle.net/21.11116/0000-000B-7549-0
Genre: Journal Article

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https://doi.org/10.1103/PhysRevMaterials.6.045002 (Publisher version)
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Varnavides, Georgios1, Author
Wang, Yaxian1, Author
Moll, Philip J. W.1, Author
Anikeeva, Polina1, Author
Narang, Prineha1, Author
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1external, ou_persistent22              

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 Abstract: A wide range of unconventional transport phenomena has recently been observed in single-crystal delafossite metals. Here, we present a theoretical framework to elucidate electron transport using a combination of first-principles calculations and numerical modeling of the anisotropic Boltzmann transport equation. Using PdCoO2 as a model system, we study different microscopic electron and phonon scattering mechanisms and establish the mean free path hierarchy of quasiparticles at different temperatures. We treat the anisotropic Fermi surface explicitly to numerically obtain experimentally-accessible transport observables, which bridge between the “diffusive,” “ballistic,” and “hydrodynamic” transport regime limits. We illustrate that the distinction between the “quasiballistic” and “quasihydrodynamic” regimes is challenging and often needs to be quantitative in nature. From first-principles calculations, we populate the resulting transport regime plots and demonstrate how the Fermi surface orientation adds complexity to the observed transport signatures in micrometer-scale devices. Our work provides key insights into microscopic interaction mechanisms on open hexagonal Fermi surfaces and establishes their connection to the macroscopic electron transport in finite-size channels.

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Language(s): eng - English
 Dates: 2022
 Publication Status: Published online
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevMaterials.6.045002
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Title: Physical Review Materials
  Abbreviation : Phys. Rev. Mater.
Source Genre: Journal
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Publ. Info: College Park, MD : American Physical Society
Pages: - Volume / Issue: 6 (4) Sequence Number: 045002 Start / End Page: - Identifier: ISSN: 2475-9953
CoNE: https://pure.mpg.de/cone/journals/resource/2475-9953