Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO$_2$
| Autor: | 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. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1073/pnas.1811873115 |
| Popis: | We study the electronic structure of the Pd-terminated surface of the non-magnetic delafossite oxide metal PdCoO$_2$. Combining angle-resolved photoemission spectroscopy and density-functional theory, we show how an electronic reconstruction driven by surface polarity mediates a Stoner-like magnetic instability towards itinerant surface ferromagnetism. Our results reveal how this leads to a rich multi-band surface electronic structure, and provide spectroscopic evidence for an intriguing sample-dependent coupling of the surface electrons to a bosonic mode which we attribute to electron-magnon interactions. Moreover, we find similar surface state dispersions in PdCrO$_2$, suggesting surface ferromagnetism persists in this sister compound despite its bulk antiferromagnetic order. Comment: 6 pages, 5 figures |
| Databáze: | arXiv |
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