Ce core-level spectroscopy, and magnetic and electrical transport properties of lightly Ce-doped YCoO3

Yoshihiko Kobayashi; Tsuyoshi Koike; Mario Okawa; Ryohei Takayanagi; Shohei Takei; Makoto Minohara; Masaki Kobayashi; Koji Horiba; Hiroshi Kumigashira; Akira Yasui; Eiji Ikenaga; Tomohiko Saitoh; Kichizo Asai

doi:10.7566/JPSJ.85.114704

Ce core-level spectroscopy, and magnetic and electrical transport properties of lightly Ce-doped YCoO₃

Yoshihiko Kobayashi, Tsuyoshi Koike, Mario Okawa, Ryohei Takayanagi, Shohei Takei, Makoto Minohara, Masaki Kobayashi, Koji Horiba, Hiroshi Kumigashira, Akira Yasui, Eiji Ikenaga, Tomohiko Saitoh, Kichizo Asai

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

2 Citations (Scopus)

Abstract

We have investigated the Ce and Co core level spectroscopy, and the magnetic and electrical transport properties of lightly Ce-doped YCoO₃. We have successfully synthesized single-phase Y_1-xCe_xCoO₃ for 0.0 ≤ x ≤ 0.1 by the sol-gel method. Hard X-ray photoelectron and X-ray absorption spectroscopy experiments reveal that the introduced Ce ions are tetravalent, which is considered to be the first case of electron doping into bulk trivalent Co oxides with perovskite RECoO₃ (RE: rare-earth element or Y) caused by RE site substitution. The magnitude of the effective magnetic moment p_eff obtained from the temperature dependence of magnetic susceptibility χ(T) at higher temperatures is close to that for high-spin Co²⁺ introduced by the Ce doping, implying that the electrons doped into the Co site induce Co²⁺ with a highspin state. For x = 0.1, ferromagnetic ordering is observed below about 7 K. Electrical transport properties such as resistivity and thermoelectric power show that negative electron-like carriers are introduced by Ce substitution.

Original language	English
Article number	114704
Journal	journal of the physical society of japan
Volume	85
Issue number	11
DOIs	https://doi.org/10.7566/JPSJ.85.114704
Publication status	Published - 2016 Nov 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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Kobayashi, Y., Koike, T., Okawa, M., Takayanagi, R., Takei, S., Minohara, M., Kobayashi, M., Horiba, K., Kumigashira, H., Yasui, A., Ikenaga, E., Saitoh, T., & Asai, K. (2016). Ce core-level spectroscopy, and magnetic and electrical transport properties of lightly Ce-doped YCoO₃ journal of the physical society of japan, 85(11), Article 114704. https://doi.org/10.7566/JPSJ.85.114704

Kobayashi, Y, Koike, T, Okawa, M, Takayanagi, R, Takei, S, Minohara, M, Kobayashi, M, Horiba, K, Kumigashira, H, Yasui, A, Ikenaga, E, Saitoh, T & Asai, K 2016, 'Ce core-level spectroscopy, and magnetic and electrical transport properties of lightly Ce-doped YCoO₃ ', journal of the physical society of japan, vol. 85, no. 11, 114704. https://doi.org/10.7566/JPSJ.85.114704

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title = "Ce core-level spectroscopy, and magnetic and electrical transport properties of lightly Ce-doped YCoO3 ",

abstract = "We have investigated the Ce and Co core level spectroscopy, and the magnetic and electrical transport properties of lightly Ce-doped YCoO3. We have successfully synthesized single-phase Y1-xCexCoO3 for 0.0 ≤ x ≤ 0.1 by the sol-gel method. Hard X-ray photoelectron and X-ray absorption spectroscopy experiments reveal that the introduced Ce ions are tetravalent, which is considered to be the first case of electron doping into bulk trivalent Co oxides with perovskite RECoO3 (RE: rare-earth element or Y) caused by RE site substitution. The magnitude of the effective magnetic moment peff obtained from the temperature dependence of magnetic susceptibility χ(T) at higher temperatures is close to that for high-spin Co2+ introduced by the Ce doping, implying that the electrons doped into the Co site induce Co2+ with a highspin state. For x = 0.1, ferromagnetic ordering is observed below about 7 K. Electrical transport properties such as resistivity and thermoelectric power show that negative electron-like carriers are introduced by Ce substitution.",

author = "Yoshihiko Kobayashi and Tsuyoshi Koike and Mario Okawa and Ryohei Takayanagi and Shohei Takei and Makoto Minohara and Masaki Kobayashi and Koji Horiba and Hiroshi Kumigashira and Akira Yasui and Eiji Ikenaga and Tomohiko Saitoh and Kichizo Asai",

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AU - Kobayashi, Yoshihiko

AU - Koike, Tsuyoshi

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AU - Takayanagi, Ryohei

AU - Takei, Shohei

AU - Minohara, Makoto

AU - Kobayashi, Masaki

AU - Horiba, Koji

AU - Kumigashira, Hiroshi

AU - Yasui, Akira

AU - Ikenaga, Eiji

AU - Saitoh, Tomohiko

AU - Asai, Kichizo

PY - 2016/11/15

Y1 - 2016/11/15

N2 - We have investigated the Ce and Co core level spectroscopy, and the magnetic and electrical transport properties of lightly Ce-doped YCoO3. We have successfully synthesized single-phase Y1-xCexCoO3 for 0.0 ≤ x ≤ 0.1 by the sol-gel method. Hard X-ray photoelectron and X-ray absorption spectroscopy experiments reveal that the introduced Ce ions are tetravalent, which is considered to be the first case of electron doping into bulk trivalent Co oxides with perovskite RECoO3 (RE: rare-earth element or Y) caused by RE site substitution. The magnitude of the effective magnetic moment peff obtained from the temperature dependence of magnetic susceptibility χ(T) at higher temperatures is close to that for high-spin Co2+ introduced by the Ce doping, implying that the electrons doped into the Co site induce Co2+ with a highspin state. For x = 0.1, ferromagnetic ordering is observed below about 7 K. Electrical transport properties such as resistivity and thermoelectric power show that negative electron-like carriers are introduced by Ce substitution.

AB - We have investigated the Ce and Co core level spectroscopy, and the magnetic and electrical transport properties of lightly Ce-doped YCoO3. We have successfully synthesized single-phase Y1-xCexCoO3 for 0.0 ≤ x ≤ 0.1 by the sol-gel method. Hard X-ray photoelectron and X-ray absorption spectroscopy experiments reveal that the introduced Ce ions are tetravalent, which is considered to be the first case of electron doping into bulk trivalent Co oxides with perovskite RECoO3 (RE: rare-earth element or Y) caused by RE site substitution. The magnitude of the effective magnetic moment peff obtained from the temperature dependence of magnetic susceptibility χ(T) at higher temperatures is close to that for high-spin Co2+ introduced by the Ce doping, implying that the electrons doped into the Co site induce Co2+ with a highspin state. For x = 0.1, ferromagnetic ordering is observed below about 7 K. Electrical transport properties such as resistivity and thermoelectric power show that negative electron-like carriers are introduced by Ce substitution.

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Ce core-level spectroscopy, and magnetic and electrical transport properties of lightly Ce-doped YCoO₃

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