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  Nearly free electrons in a 5d delafossite oxide metal

Kushwaha, P., Sunko, V., Moll, P. J. W., Bawden, L., Riley, J. M., Nandi, N., et al. (2015). Nearly free electrons in a 5d delafossite oxide metal. Science Advances, 1(9): E1500692, pp. 1-6. doi:10.1126/sciadv.1500692.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-1A2A-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-262F-1
Genre: Journal Article

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 Creators:
Kushwaha, Pallavi1, Author              
Sunko, Veronika2, Author              
Moll, Philip J. W.3, Author
Bawden, Lewis3, Author
Riley, Jonathon M.3, Author
Nandi, Nabhanila2, Author              
Rosner, Helge4, Author              
Schmidt, Marcus Peter5, Author              
Arnold, Frank6, Author              
Hassinger, Elena6, Author              
Kim, Timur K.3, Author
Hoesch, Moritz3, Author
Mackenzie, Andrew P.7, Author              
King, Phil D. C.3, Author
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3External Organizations, ou_persistent22              
4Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863450              
5Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              
6Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_2466700              
7Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              

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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{̑extperiodcentered}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.

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Language(s): eng - English
 Dates: 2015-10-23
 Publication Status: Published online
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 Identifiers: DOI: 10.1126/sciadv.1500692
BibTex Citekey: Kushwahae1500692
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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 1 (9) Sequence Number: E1500692 Start / End Page: 1 - 6 Identifier: Other: 2375-2548
CoNE: /journals/resource/2375-2548