文章基本信息

标题：Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO2
作者：Federico Mazzola ; Veronika Sunko ; Seunghyun Khim 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2018
卷号：115
期号：51
页码：12956-12960
DOI：10.1073/pnas.1811873115
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：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.
关键词：delafossite ; itinerant ferromagnetism ; electronic reconstruction ; transition-metal oxide ; angle-resolved photoemission