Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO2
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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.
Mazzola , F , Sunko , V , Khim , S , Rosner , H , Kushwaha , P , Clark , O J , Bawden , L , Marković , I , Kim , T K , Hoesch , M , Mackenzie , A P & King , P D C 2018 , ' Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO 2 ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 115 , no. 51 , pp. 12956-12960 . https://doi.org/10.1073/pnas.1811873115
Proceedings of the National Academy of Sciences of the United States of America
© 2018, the Author(s). This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1073/pnas.1811873115
DescriptionFunding: Engineering and Physical Sciences Research Council, UK (Grant No. EP/I031014/1); VS, LB, and OJC acknowledge EPSRC for PhD studentship support through grant Nos. EP/L015110/1, EP/G03673X/1, and EP/K503162/1)
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