A high-TC heavy rare earth monoxide semiconductor TbO with a more than half-filled 4f orbital
Satoshi Sasaki1, Daichi Oka1, Kenichi Kaminaga2
1Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan. tomoteru.fukumura.e4@tohoku.ac.jp.
Abstract:
Terbium monoxide, TbO, with an unusual valence state of Tb2+ ([Xe]4f85d1) has been known to exist as a gas phase. In this study, we report a solid phase rock-salt structured TbO in the form of an epitaxial thin film. This TbO is a narrow gap ferromagnetic semiconductor with a bandgap of ∼0.1 eV and high Curie temperature of 231 K, and exhibited negative magnetoresistance of -14% at 9 T and 2 K. Its magnetization steeply increased with the appearance of a wasp-waisted hysteresis curve significantly below the Curie temperature at about 20 K. These results suggested that both 4f and 5d magnetic sublattices were formed at a single magnetic Tb2+ site in TbO.
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