From antiferromagnetic insulator to ferromagnetic metal: Effects of hydrogen substitution in LaMnAsO

Taku Hanna, Satoru Matusishi, Katsuaki Kodama, Toshiya Otomo, Shin Ichi Shamoto, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number020401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number2
DOIs
Publication statusPublished - 2013 Jan 2

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'From antiferromagnetic insulator to ferromagnetic metal: Effects of hydrogen substitution in LaMnAsO'. Together they form a unique fingerprint.

Cite this