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dc.contributor.authorKushwaha, Pallavi
dc.contributor.authorSunko, Veronika
dc.contributor.authorMoll, P.J.W.
dc.contributor.authorBawden, Lewis
dc.contributor.authorRiley, Jonathon Mark
dc.contributor.authorNandi, Nabhanila
dc.contributor.authorRosner, H.
dc.contributor.authorSchmidt, M.P.
dc.contributor.authorArnold, F.
dc.contributor.authorHassinger, E.
dc.contributor.authorKim, T.K.
dc.contributor.authorHoesch, M.
dc.contributor.authorMackenzie, Andrew
dc.contributor.authorKing, Phil
dc.identifier.citationKushwaha , 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 .
dc.description.abstractUnderstanding 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.
dc.relation.ispartofScience Advancesen
dc.subjectDelafossite oxideen
dc.subject5d metalen
dc.subjectNearly-free electronsen
dc.subjectQC Physicsen
dc.titleNearly-free electrons in a 5d delafossite oxide metalen
dc.typeJournal articleen
dc.contributor.sponsorThe Royal Societyen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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