Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Electronic Structure of Surfaces: Spectroscopy, Surface States I

O 79.10: Vortrag

Mittwoch, 22. März 2017, 17:30–17:45, WIL C307

Surface states of transition-metal delafossite oxides — •Veronika Sunko1,2, Helge Rosner2, Pallavi Kushwaha2, Lewis Bawden1, Oliver J. Clark1, Jonathon M. Riley2,3, Deepa Kasinathan2, Maurits W. Haverkort2, Andrew P. Mackenzie1,2, and Philip D.C. King21SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK — 2MPI-CPfS, Nöthnitzer Straße 40, 01217 Dresden, Germany — 3Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, UK

Delafossite oxides have recently attracted considerable attention because of their fascinating transport properties[1]. PdCoO2 and PtCoO2 are the most conductive oxides known at room temperature, with resistivities comparable to those of silver, copper and gold[2, 3]. This high conductivity is attributed to a single broad band crossing the Fermi level[3]. However, due to the polarity of the structure the electronic properties at the surfaces can be very different to those of the bulk[4]. We use angle resolved photoemission (ARPES) to show that the CoO2 terminated surfaces of (Pd,Pt)CoO2 do host a set of states which do not appear in the bulk, with much higher masses and stronger interactions. Comparing ARPES with density functional theory and model tight-binding calculations, we investigate the origin of these states, paying special attention to the role of the spin-orbit coupling.

[1] Moll et al., Science 351 (2016) 6277, Kikugawa et al., Nature Commun. 7 (2016) 10903 [2] Hicks et al., PRL 109 (2012) 116401 [3] Kushwaha et al., Science Adv. 1 (2015) e1500692 [4] Kim et al., PRB 80 (2009) 035116, Noh et al., PRL 102 (2009) 256404

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