Journal Article

PUBDB-2019-05609

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Itinerant ferromagnetism of the Pd-terminated polar surface of $PdCoO_{2}$

Mazzola, F. ; Sunko, V. ; Khim, S. ; Rosner, H. ; Kushwaha, P. ; Clark, O. J. ; Bawden, L. ; Marković, I. ; Kim, T. K. ; Hoesch, M.DESY* ; Mackenzie, A. P. ; King, P. D. C.

2018
National Acad. of Sciences Washington, DC

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Please use a persistent id in citations: doi:10.1073/pnas.1811873115  doi:10.3204/PUBDB-2019-05609

Abstract: There has been widespread interest in using interfaces of transition-metal oxides as a platform to control not only their electronic structure, as in semiconductor heterostructures, but also to tune between different collective phases. A major goal is to realize states of the quantum many-body system that are not found in the bulk phase diagrams of the constituent materials. Here, we perform a combined experimental and theoretical study of the delafossite oxide metals PdCoO2 and PdCrO2, finding how electronic reconstructions at their polar surfaces drive instabilities to itinerant surface ferromagnetism. Neither compound supports ferromagnetism in bulk, with PdCrO2 a bulk antiferromagnet, demonstrating how a delicate competition of magnetic correlations can be engineered by intrinsic self-doping at a polar surface or interface.

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Contributing Institute(s):

1. Experimentebetreuung PETRA III (FS-PE)

Research Program(s):

1. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)

Experiment(s):

1. Measurement at external facility

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