Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO2

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

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16 Citations (Scopus)
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Abstract

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.
Original languageEnglish
Pages (from-to)12956-12960
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume115
Issue number51
Early online date4 Dec 2018
DOIs
Publication statusPublished - 18 Dec 2018

Keywords

  • Delafossite
  • Itinerant ferromagnetism
  • Electronic reconstruction
  • Transition-metal oxide
  • Angle-resolved photoemission

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