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From antiferromagnetic insulator to ferromagnetic metal; Effect of hydrogen substitution in LaMnAsO

反強磁性絶縁体から強磁性金属へ; LaMnAsOにおける水素置換効果

半那 拓*; 松石 聡*; 樹神 克明; 大友 季哉*; 社本 真一; 細野 秀雄*

Hanna, Taku*; Matsuishi, Satoru*; Kodama, Katsuaki; Otomo, Toshiya*; Shamoto, Shinichi; Hosono, Hideo*

Manganese oxyarsenide hydrides LaMnAsO$$_{1-x}$$H$$_x$$ ($$x$$ = 0-0.73) were synthesized by a solid state reaction under a high pressure of 2 GPa. The hydride ions H$$^-$$ in O$$^{2-}$$ sites induced an insulator-to-metal conversion and suppressed the antiferromagnetic ordering of Mn spins. Instead, ferromagnetism with negative magnetoresistance was observed. The Curie temperature and saturated moment per Mn increased with $$x$$ up to 264 K and 1.5 $$mu_B$$, respectively, at $$x$$ = 0.73. These results indicate that H$$^-$$ donate conduction electrons to the MnAs layer, mediating a direct ferromagnetic interaction between Mn atoms.

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パーセンタイル:20.46

分野:Materials Science, Multidisciplinary

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