1. Hard and soft x-ray photoemission spectroscopy study of the new Kondo system SmO thin film
- Author
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Sakamoto, Shoya, Kaminaga, Kenichi, Oka, Daichi, Yukawa, Ryu, Horio, Masafumi, Yokoyama, Yuichi, Yamamoto, Kohei, Takubo, Kou, Nonaka, Yosuke, Koshiishi, Keisuke, Kobayashi, Masaki, Tanaka, Arata, Yasui, Akira, Ikenaga, Eiji, Wadati, Hiroki, Kumigashira, Hiroshi, Fukumura, Tomoteru, and Fujimori, Atsushi
- Subjects
Condensed Matter - Strongly Correlated Electrons - Abstract
SmO thin film is a new Kondo system showing a resistivity upturn around 10 K and was theoretically proposed to have a topologically nontrivial band structure. We have performed hard x-ray and soft x-ray photoemission spectroscopy to elucidate the electronic structure of SmO. From the Sm 3$d$ core-level spectra, we have estimated the valence of Sm to be $\sim$2.96, proving that the Sm has a mixed valence. The valence-band photoemission spectra exhibit a clear Fermi edge originating from the Sm 5$d$-derived band. The present finding is consistent with the theory suggesting a possible topological state in SmO and show that rare-earth monoxides or their heterostructures can be a new playground for the interplay of strong electron correlation and spin-orbit coupling.
- Published
- 2020
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