A divalent rare earth oxide semiconductor: Yttrium monoxide

Kenichi Kaminaga; Ryosuke Sei; Koichi Hayashi; Naohisa Happo; Hiroo Tajiri; Daichi Oka; Tomoteru Fukumura; Tetsuya Hasegawa

doi:10.1063/1.4944330

A divalent rare earth oxide semiconductor: Yttrium monoxide

Kenichi Kaminaga, Ryosuke Sei, Koichi Hayashi, Naohisa Happo, Hiroo Tajiri, Daichi Oka, Tomoteru Fukumura, Tetsuya Hasegawa

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

23 Citations (Scopus)

Abstract

Rare earth oxides are usually widegap insulators like Y₂O₃ with closed shell trivalent rare earth ions. In this study, solid phase rock salt structure yttrium monoxide, YO, with unusual valence of Y²⁺ (4d¹) was synthesized in a form of epitaxial thin film by pulsed laser deposition method. YO has been recognized as gaseous phase in previous studies. In contrast with Y₂O₃, YO was dark-brown colored and narrow gap semiconductor. The tunable electrical conductivity ranging from 10^-1 to 10³ Ω^-1cm^-1 was attributed to the presence of oxygen vacancies serving as electron donor. Weak antilocalization behavior observed in magnetoresistance indicated significant role of spin-orbit coupling as a manifestation of 4d electron carrier.

Original language	English
Article number	122102
Journal	Applied Physics Letters
Volume	108
Issue number	12
DOIs	https://doi.org/10.1063/1.4944330
Publication status	Published - 2016 Mar 21

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4944330

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title = "A divalent rare earth oxide semiconductor: Yttrium monoxide",

abstract = "Rare earth oxides are usually widegap insulators like Y2O3 with closed shell trivalent rare earth ions. In this study, solid phase rock salt structure yttrium monoxide, YO, with unusual valence of Y2+ (4d1) was synthesized in a form of epitaxial thin film by pulsed laser deposition method. YO has been recognized as gaseous phase in previous studies. In contrast with Y2O3, YO was dark-brown colored and narrow gap semiconductor. The tunable electrical conductivity ranging from 10-1 to 103 Ω-1cm-1 was attributed to the presence of oxygen vacancies serving as electron donor. Weak antilocalization behavior observed in magnetoresistance indicated significant role of spin-orbit coupling as a manifestation of 4d electron carrier.",

author = "Kenichi Kaminaga and Ryosuke Sei and Koichi Hayashi and Naohisa Happo and Hiroo Tajiri and Daichi Oka and Tomoteru Fukumura and Tetsuya Hasegawa",

note = "Funding Information: We acknowledge Professor Jun Yamasaki for helpful discussion. The XANES experiments were performed at BL13XU, SPring-8 (Proposal No. 2015A0116). This work was supported by JST-CREST,the Japan Society for the Promotion of Science (JSPS) with Grant-in-Aid for Scientific Research on Innovative Areas (Nos. 26105002 and 26105006), and Nanotechnology Platform (Project No.12024046) of MEXT, Japan. Publisher Copyright: {\textcopyright} 2016 AIP Publishing LLC.",

year = "2016",

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doi = "10.1063/1.4944330",

language = "English",

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T2 - Yttrium monoxide

AU - Kaminaga, Kenichi

AU - Sei, Ryosuke

AU - Hayashi, Koichi

AU - Happo, Naohisa

AU - Tajiri, Hiroo

AU - Oka, Daichi

AU - Fukumura, Tomoteru

AU - Hasegawa, Tetsuya

N1 - Funding Information: We acknowledge Professor Jun Yamasaki for helpful discussion. The XANES experiments were performed at BL13XU, SPring-8 (Proposal No. 2015A0116). This work was supported by JST-CREST,the Japan Society for the Promotion of Science (JSPS) with Grant-in-Aid for Scientific Research on Innovative Areas (Nos. 26105002 and 26105006), and Nanotechnology Platform (Project No.12024046) of MEXT, Japan. Publisher Copyright: © 2016 AIP Publishing LLC.

PY - 2016/3/21

Y1 - 2016/3/21

N2 - Rare earth oxides are usually widegap insulators like Y2O3 with closed shell trivalent rare earth ions. In this study, solid phase rock salt structure yttrium monoxide, YO, with unusual valence of Y2+ (4d1) was synthesized in a form of epitaxial thin film by pulsed laser deposition method. YO has been recognized as gaseous phase in previous studies. In contrast with Y2O3, YO was dark-brown colored and narrow gap semiconductor. The tunable electrical conductivity ranging from 10-1 to 103 Ω-1cm-1 was attributed to the presence of oxygen vacancies serving as electron donor. Weak antilocalization behavior observed in magnetoresistance indicated significant role of spin-orbit coupling as a manifestation of 4d electron carrier.

AB - Rare earth oxides are usually widegap insulators like Y2O3 with closed shell trivalent rare earth ions. In this study, solid phase rock salt structure yttrium monoxide, YO, with unusual valence of Y2+ (4d1) was synthesized in a form of epitaxial thin film by pulsed laser deposition method. YO has been recognized as gaseous phase in previous studies. In contrast with Y2O3, YO was dark-brown colored and narrow gap semiconductor. The tunable electrical conductivity ranging from 10-1 to 103 Ω-1cm-1 was attributed to the presence of oxygen vacancies serving as electron donor. Weak antilocalization behavior observed in magnetoresistance indicated significant role of spin-orbit coupling as a manifestation of 4d electron carrier.

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A divalent rare earth oxide semiconductor: Yttrium monoxide

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