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  1. 数理物質系 (Faculty of Pure and Applied Sciences)
  2. 関場 大一郎 (Sekiba Daiichiro)
  1. コンテンツタイプ (Contents Type)
  2. 雑誌発表論文等 (Journal article, etc.)
  3. A~
  4. Applied physics letters

Composition-induced structural, electrical, and magnetic phase transitions in AX-type mixed-valence cobalt oxynitride epitaxial thin films

http://hdl.handle.net/2241/00134942
59213529-424b-4470-8a9e-0527de60655e
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APL_107-23.pdf APL_107-23 (4.6 MB)
item type Journal Article(1)
公開日 2016-02-04
タイトル
タイトル Composition-induced structural, electrical, and magnetic phase transitions in AX-type mixed-valence cobalt oxynitride epitaxial thin films
言語
言語 eng
資源タイプ
タイプ journal article
著者 Takahashi, Jumpei

× Takahashi, Jumpei

WEKO 125925

Takahashi, Jumpei

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Hirose, Yasushi

× Hirose, Yasushi

WEKO 125926

Hirose, Yasushi

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Oka, Daichi

× Oka, Daichi

WEKO 125927

Oka, Daichi

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Nakao, Shoichiro

× Nakao, Shoichiro

WEKO 125928

Nakao, Shoichiro

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Yang, Chang

× Yang, Chang

WEKO 125929

Yang, Chang

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Fukumura, Tomoteru

× Fukumura, Tomoteru

WEKO 125930

Fukumura, Tomoteru

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Harayama, Isao

× Harayama, Isao

WEKO 125931

Harayama, Isao

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Sekiba, Daiichiro

× Sekiba, Daiichiro

WEKO 125932

Sekiba, Daiichiro

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Hasegawa, Tetsuya

× Hasegawa, Tetsuya

WEKO 125933

Hasegawa, Tetsuya

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著者別名 関場, 大一郎

× 関場, 大一郎

WEKO 125983
e-Rad 20396807
筑波大学研究者総覧 0000000740

関場, 大一郎

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抄録
内容記述 Synthesis of mid- to late-transition metal oxynitrides is generally difficult by conventional thermal ammonolysis because of thermal instability. In this letter, we synthesized epitaxialthin films of AX-type phase-pure cobalt oxynitrides (CoOxNy) by using nitrogen-plasma-assisted pulsed laser deposition and investigated their structural, electrical, and magnetic properties. The CoOxNythin films with 0 ≤ y/(x + y) ≤ 0.63 grown on MgO (100) substrates showed a structuralphase transition from rock salt (RS) to zinc blend at the nitrogen content y/(x + y) ∼ 0.5. As the nitrogen content increased, the room-temperature electrical resistivity of the CoOxNythin films monotonically decreased from the order of 105 Ω cm to 10−4 Ω cm. Furthermore, we observed an insulator-to-metal transition at y/(x + y) ∼ 0.34 in the RS-CoOxNy phase, which has not yet been reported in Co2+/Co3+ mixed-valence cobalt oxides with octahedral coordination. The low resistivity in the RS-CoOxNy phase, on the 10−3 Ω cm order, may have originated from the intermediate spin state of Co3+ stabilized by the lowered crystal field symmetry of the CoO6−nNn octahedra (n = 1, 2,…5). Magnetization measurements suggested that a magnetic phase transition occurred in the RS-CoOxNyfilms during the insulator-to-metal transition. These results demonstrate that low-temperature epitaxialgrowth is a promising approach for exploring novel electronic functionalities in oxynitrides.
書誌情報 Applied physics letters

巻 107, 号 23, p. 231906, 発行日 2015-12
ISSN
収録物識別子 0003-6951
書誌レコードID
収録物識別子 AA00543431
DOI
関連識別子
関連識別子 10.1063/1.4937431
権利
権利情報 © 2015 AIP Publishing LLC.
権利
権利情報 This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 107, 231906 (2015) and may be found at http://dx.doi.org/10.1063/1.4937431.
著者版フラグ
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出版者
出版者 Applied physics letters
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