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dc.contributor.authorUsui, Hidetomo
dc.contributor.authorOchi, Masayuki
dc.contributor.authorKitamura, Sota
dc.contributor.authorOka, Takashi
dc.contributor.authorOgura, Daisuke
dc.contributor.authorRosner, Helge
dc.contributor.authorW. Haverkort, Maurits
dc.contributor.authorSunko, Veronika
dc.contributor.authorKing, Philip David
dc.contributor.authorMackenzie, Andrew Peter
dc.contributor.authorKuroki, Kazuhiko
dc.identifier.citationUsui , H , Ochi , M , Kitamura , S , Oka , T , Ogura , D , Rosner , H , W. Haverkort , M , Sunko , V , King , P D , Mackenzie , A P & Kuroki , K 2019 , ' Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO 2 ' , Physical Review Materials , vol. 3 , no. 4 , 045002 .
dc.description.abstractWe study the electronic structure of delafossite PtCoO2 to elucidate its extremely small resistivity and high mobility. The band exhibits steep dispersion near the Fermi level despite the fact that itis formed mainly by Pt d orbitals that are typically localized. We propose a picture based on two hidden kagome-lattice-like electronic structure: one originating from Pt s + px/py orbitals, and the other from Pt d3z^2-r^2 + dxy/dx^2y^2 orbitals, each placed on the bonds of the triangular lattice. In particular, we find that the underlying Pt s + px/py bands actually determine the steepness of the original dispersion, so that the large Fermi velocity can be attributed to the large width of the Pt s + px/py band. In addition, the kagome-like electronic structure gives rise to "orbital-momentum locking" on the Fermi surface, which reduces the electron scattering by impurities. We conclude that the combination of the large Fermi velocity and the orbital-momentum locking is likely to be the origin of the extremely small resistivity in PtCoO2.
dc.relation.ispartofPhysical Review Materialsen
dc.subjectQC Physicsen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.titleHidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO2en
dc.typeJournal articleen
dc.contributor.sponsorEuropean Research Councilen
dc.contributor.sponsorThe Royal Societyen
dc.contributor.institutionUniversity of St Andrews. Centre for Designer Quantum Materialsen
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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