Electronic structure of metallic delafossite oxides
Metallic delafossites are materials which show intriguing properties revealed over the past years. This includes ultra-high conductivity, unconventional magnetism, and the potential to host strongly spin-orbit coupled states at their surfaces and interfaces. Structurally, they are layered materials with triangular in-plane lattices of transition metal atoms. This results in a quasi two-dimensional Fermi surface and very anisotropic transport properties.
We study the Fermi surface topography of these compounds with our newly built state-of-the-art torque magnetometer in order to learn more about the electron interactions in the material and their influence on the transport properties. Quantum oscillation measurements give such a detailed knowledge of the Fermi surface and especially its c-axis warping parameters, that DFT calculations can be improved by a direct comparison. A comparison of the different compounds (PtCoO2 and PdRhO2) in the series allows to tune the spin orbit coupling and interaction terms.
Publications
Arnold, F.; Naumann, M.; Rosner, H.; Kikugawa, N.; Graf, D.; Balicas, L.; Terashima, T.; Uji, S.; Takatsu, H.; Khim, S. et al.
Fermi surface of PtCoO2 from quantum oscillations and electronic structure calculations
Physical Review B 101 (19), 195101 (2020)DOI
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Arnold, F.; Naumann, M.; Khim, S.; Rosner, H.; Sunko, V.; Mazzola, F.; King, P. D. C.; Mackenzie, A. P.; Hassinger, E.
Quasi-two-dimensional Fermi surface topography of the delafossite PdRhO2
Physical Review B 96, 075163 (2017)DOI
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Kushwaha, P.; Sunko, V.; Moll, P. J. W.; Bawden, L.; Riley, J. M.; Nandi, N.; Rosner, H.; Schmidt, M. P.; Arnold, F.; Hassinger, E. et al.
Nearly free electrons in a 5d delafossite oxide metal
Science Advances 1 (9), E1500692 (2015)