Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 115, Issue 51, Pages 12956-12960Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1811873115
Keywords
delafossite; itinerant ferromagnetism; electronic reconstruction; transition-metal oxide; angle-resolved photoemission
Categories
Funding
- European Research Council [714193]
- Engineering and Physical Sciences Research Council, United Kingdom [EP/I031014/1]
- Royal Society
- Max-Planck Society
- International Max-Planck Partnership for Measurement and Observation at the Quantum Limit
- Engineering and Physical Sciences Research Council [EP/L015110/1, EP/G03673X/1, EP/K503162/1]
- International Max-Planck Research School for Chemistry and Physics of Quantum Materials
- European Research Council (ERC) [714193] Funding Source: European Research Council (ERC)
- EPSRC [EP/I031014/1] Funding Source: UKRI
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The ability to modulate the collective properties of correlated electron systems at their interfaces and surfaces underpins the burgeoning field of designer quantum materials. Here, we show how an electronic reconstruction driven by surface polarity mediates a Stoner-like magnetic instability to itinerant ferromagnetism at the Pd-terminated surface of the nonmagnetic delafossite oxide metal PdCoO2. Combining angle-resolved photoemission spectroscopy and density-functional theory calculations, we show how this leads to a rich multiband surface electronic structure. We find similar surface state dispersions in PdCrO2, suggesting surface ferromagnetism persists in this sister compound despite its bulk antiferromagnetic order.
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