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Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO2

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Kitamura,  Sota
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Oka,  Takashi
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Usui, H., Ochi, M., Kitamura, S., Oka, T., Ogura, D., Rosner, H., et al. (2019). Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO2. Physical Review Materials, 3(4): 045002. doi:10.1103/PhysRevMaterials.3.045002.


Cite as: https://hdl.handle.net/21.11116/0000-0003-D236-3
Abstract
We study the electronic structure of delafossite PtCoO(2 )to elucidate its extremely small resistivity and high mobility. The band exhibits steep dispersion near the Fermi level despite the fact that it is formed mainly by Pt d orbitals that are typically localized. We propose a picture based on two hidden kagome-lattice-like electronic structures: one originating from Pt s p(x)/p(y) orbitals, and the other from Pt d(3z2-r2) + d(xy)/d(x2- y2 )orbitals, each placed on the bonds of the triangular lattice. In particular, we find that the underlying Pt s p(x/)p(y) 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 p(x)/p(y) 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.