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論文

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

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

Physical Review B, 87(2), p.020401_1 - 020401_5, 2013/01

https://doi.org/10.1103/PhysRevB.87.020401
 被引用回数：35 パーセンタイル：78.6(Materials Science, Multidisciplinary)

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.

論文

Structural analysis and superconductivity of CeFeAsO$$_{1-x}$$H$$_{x}$$

松石 聡*; 半那 拓*; 村場 善行*; Kim, S. W.*; Kim, J. E.*; 高田 昌樹*; 社本 真一; Smith, R. I.*; 細野 秀雄*

Physical Review B, 85(1), p.014514_1 - 014514_6, 2012/01

https://doi.org/10.1103/PhysRevB.85.014514
 被引用回数：46 パーセンタイル：84.61(Materials Science, Multidisciplinary)

LnFeAsO$$_{1-x}$$H$$_{x}$$($$Ln$$=lanthanoid)の1111型鉄系超伝導体を代表して、CeFeAsO$$_{1-x}$$(D,H)$$_{x}$$ ($$x$$=0.0-0.48)で粉末中性子回折と放射光X線回折測定を行った。これらの結果は、出発物質の水素の種類に関係なく両方の試料でH$$^{-}$$イオンが酸素サイトを占めていることを強く示唆している。

論文

Hydrogen in layered iron arsenides; Indirect electron doping to induce superconductivity

半那 拓*; 村場 善行*; 松石 聡*; 井川 直樹; 樹神 克明; 社本 真一; 細野 秀雄*

Physical Review B, 84(2), p.024521_1 - 024521_7, 2011/07

https://doi.org/10.1103/PhysRevB.84.024521
 被引用回数：102 パーセンタイル：94.65(Materials Science, Multidisciplinary)

Utilizing the high stability of calcium and rare-earth hydrides, CaFeAsF$$_{1-x}$$H$$_x$$ ($$x$$ = 0.0-1.0) and SmFeAsO$$_{1-x}$$H$$_x$$ ($$x$$ = 0.0-0.47) have been synthesized using high pressure to form hydrogen-substituted 1111-type iron-arsenide superconductors. Neutron diffraction and density functional calculations have demonstrated that the hydrogens are incorporated as H$$^-$$ ions occupying F$$^-$$ sites in the blocking layer of CaFeAsF. The resulting CaFeAsO$$_{1-x}$$H$$_x$$ is nonsuperconducting, whereas, SmFeAsO$$_{1-x}$$H$$_x$$ is a superconductor, with an optimal $$T$$$$_{rm c}$$ =55 K at $$x$$ $$sim$$ 0.2. It was found that up to 40% of the O$$^{2-}$$ ions can be replaced by H$$^-$$ ions, with electrons being supplied into the FeAs layer to maintain neutrality (O$$^{2-}$$ = H$$^-$$ + e$$^-$$). When $$x$$ exceeded 0.2, $$T$$$$_{rm c}$$ was reduced corresponding to an electron overdoped region.

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