Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO2
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We 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.
Usui , 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 . https://doi.org/10.1103/PhysRevMaterials.3.045002
Physical Review Materials
Copyright © 2019, American Physical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevMaterials.3.045002
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