Manganese oxyarsenide hydrides LaMnAsO1-xHx (x=0-0.73) were synthesized by a solid-state reaction under a high pressure of 2 GPa. The hydride ions H- in O2- 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 1.5μB, 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.
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||Published - 2013 1月 2|
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