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Nearly-free electrons in a 5d delafossite oxide metal

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Date
23/10/2015
Author
Kushwaha, Pallavi
Sunko, Veronika
Moll, P.J.W.
Bawden, Lewis
Riley, Jonathon Mark
Nandi, Nabhanila
Rosner, H.
Schmidt, M.P.
Arnold, F.
Hassinger, E.
Kim, T.K.
Hoesch, M.
Mackenzie, Andrew
King, Phil
Keywords
PtCoO2
Delafossite oxide
5d metal
Nearly-free electrons
QC Physics
DAS
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Abstract
Understanding the role of electron correlations in strong spin-orbit transition-metal oxides is key to the realization of numerous exotic phases including spin-orbit–assisted Mott insulators, correlated topological solids, and prospective new high-temperature superconductors. To date, most attention has been focused on the 5d iridium-based oxides. We instead consider the Pt-based delafossite oxide PtCoO2. Our transport measurements, performed on single-crystal samples etched to well-defined geometries using focused ion beam techniques, yield a room temperature resistivity of only 2.1 microhm·cm (μΩ-cm), establishing PtCoO2 as the most conductive oxide known. From angle-resolved photoemission and density functional theory, we show that the underlying Fermi surface is a single cylinder of nearly hexagonal cross-section, with very weak dispersion along kz. Despite being predominantly composed of d-orbital character, the conduction band is remarkably steep, with an average effective mass of only 1.14me. Moreover, the sharp spectral features observed in photoemission remain well defined with little additional broadening for more than 500 meV below EF, pointing to suppressed electron-electron scattering. Together, our findings establish PtCoO2 as a model nearly-free–electron system in a 5d delafossite transition-metal oxide.
Citation
Kushwaha , P , Sunko , V , Moll , P J W , Bawden , L , Riley , J M , Nandi , N , Rosner , H , Schmidt , M P , Arnold , F , Hassinger , E , Kim , T K , Hoesch , M , Mackenzie , A & King , P 2015 , ' Nearly-free electrons in a 5 d delafossite oxide metal ' , Science Advances , vol. 1 , no. 9 , e1500692 . https://doi.org/10.1126/sciadv.1500692
Publication
Science Advances
Status
Peer reviewed
DOI
https://doi.org/10.1126/sciadv.1500692
ISSN
2375-2548
Type
Journal article
Rights
Copyright © 2015, The Authors This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/7689

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