Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO2.

Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO2.

Proc Natl Acad Sci U S A. 2018 Dec 04;:

Authors: Mazzola F, Sunko V, Khim S, Rosner H, Kushwaha P, Clark OJ, Bawden L, Marković I, Kim TK, Hoesch M, Mackenzie AP, King PDC

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.

PMID: 30514820 [PubMed - as supplied by publisher]

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