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 journalArticlepeer-review

23 Citations (Scopus)


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 languageEnglish
Article number122102
JournalApplied Physics Letters
Issue number12
Publication statusPublished - 2016 Mar 21

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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