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  Controlled Introduction of Defects to Delafossite Metals by Electron Irradiation

Sunko, V., McGuinness, P., Chang, C., Zhakina, E., Khim, S., Dreyer, C., et al. (2020). Controlled Introduction of Defects to Delafossite Metals by Electron Irradiation. Physical Review X, 10(2): 021018. doi:10.1103/PhysRevX.10.021018.

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https://doi.org/10.1103/PhysRevX.10.021018 (Publisher version)
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 Creators:
Sunko, V.1, Author
McGuinness, P. H.1, Author
Chang, C. S.1, Author
Zhakina, E.1, Author
Khim, S.1, Author
Dreyer, C. E.1, Author
Konczykowski, M.1, Author
Borrmann, H.1, Author
Moll, P. J. W.1, Author
König, M.1, Author
Muller, D. A.1, Author
Mackenzie, A. P.1, Author
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1external, ou_persistent22              

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 Abstract: The delafossite metals PdCoO2, PtCoO2, and PdCrO2 are among the highest conductivity materials known, with low-temperature mean free paths of tens of microns in the best as-grown single crystals. A key question is whether these very low resistive scattering rates result from strongly suppressed backscattering due to special features of the electronic structure or are a consequence of highly unusual levels of crystalline perfection. We report the results of experiments in which high-energy electron irradiation was used to introduce point disorder to the Pd and Pt layers in which the conduction occurs. We obtain the cross section for formation of Frenkel pairs in absolute units, and cross-check our analysis with first-principles calculations of the relevant atomic displacement energies. We observe an increase of resistivity that is linear in defect density with a slope consistent with scattering in the unitary limit. Our results enable us to deduce that the as-grown crystals contain extremely low levels of in-plane defects of approximately 0.001%. This confirms that crystalline perfection is the most important factor in realizing the long mean free paths and highlights how unusual these delafossite metals are in comparison with the vast majority of other multicomponent oxides and alloys. We discuss the implications of our findings for future materials research.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevX.10.021018
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Title: Physical Review X
  Abbreviation : Phys. Rev. X
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 10 (2) Sequence Number: 021018 Start / End Page: - Identifier: Other: 2160-3308
CoNE: https://pure.mpg.de/cone/journals/resource/2160-3308