Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO2
Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO2
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DOI：
10.1073/pnas.1811873115
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发表时间：
2018-12-18
影响因子：
11.1
通讯作者：
King, Phil D. C.
中科院分区：
文献类型：
--
作者：
Mazzola, Federico;Sunko, Veronika;King, Phil D. C.
在界面和表面调制相关电子系统的集体性质的能力支撑着新兴的“设计师”量子材料领域。在这里，我们展示了如何由表面极性驱动的电子重建介导的Stoner样的磁不稳定性巡回铁磁性在Pd-终止表面的铁锰矿氧化物金属PdCoO 2。结合角分辨光电子能谱和密度泛函理论计算，我们展示了这是如何导致丰富的多带表面电子结构。我们发现类似的表面状态分散在PdCrO 2，这表明表面铁磁性持续在这个姐妹化合物，尽管其散装反铁磁秩序。
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.