Samarium monoxide epitaxial thin film as a possible heavy-fermion compound

Yutaka Uchida; Kenichi Kaminaga; Tomoteru Fukumura; Tetsuya Hasegawa

doi:10.1103/PhysRevB.95.125111

Samarium monoxide epitaxial thin film as a possible heavy-fermion compound

Yutaka Uchida, Kenichi Kaminaga, Tomoteru Fukumura, Tetsuya Hasegawa

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

SmO (001) epitaxial thin films were grown on YAlO3 (110) substrates by pulsed laser deposition method. X-ray photoemission spectroscopy indicated coexistence of Sm2+ and Sm3+, suggesting a valence fluctuating state. A SmO thin film showed a metallic conductionlike SmO polycrystal in a previous study. However, a SmO thin film showed nonmonotonical temperature dependence at low temperature in contrast with the polycrystal. A local resistivity minimum was observed at 16 K, probably caused by the dense Kondo effect, and the resistivity below 2 K was proportional to T2. These features suggest the heavy-fermionic nature of SmO.

Original language	English
Article number	125111
Journal	Physical Review B
Volume	95
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.95.125111
Publication status	Published - 2017 Mar 8

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "SmO (001) epitaxial thin films were grown on YAlO3 (110) substrates by pulsed laser deposition method. X-ray photoemission spectroscopy indicated coexistence of Sm2+ and Sm3+, suggesting a valence fluctuating state. A SmO thin film showed a metallic conductionlike SmO polycrystal in a previous study. However, a SmO thin film showed nonmonotonical temperature dependence at low temperature in contrast with the polycrystal. A local resistivity minimum was observed at 16 K, probably caused by the dense Kondo effect, and the resistivity below 2 K was proportional to T2. These features suggest the heavy-fermionic nature of SmO.",

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AU - Uchida, Yutaka

AU - Kaminaga, Kenichi

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AU - Hasegawa, Tetsuya

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AB - SmO (001) epitaxial thin films were grown on YAlO3 (110) substrates by pulsed laser deposition method. X-ray photoemission spectroscopy indicated coexistence of Sm2+ and Sm3+, suggesting a valence fluctuating state. A SmO thin film showed a metallic conductionlike SmO polycrystal in a previous study. However, a SmO thin film showed nonmonotonical temperature dependence at low temperature in contrast with the polycrystal. A local resistivity minimum was observed at 16 K, probably caused by the dense Kondo effect, and the resistivity below 2 K was proportional to T2. These features suggest the heavy-fermionic nature of SmO.

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