Antiferromagnetic bipolar semiconductor LaMnPO with ZrCuSiAs-type structure

Hiroshi Yanagi, Takumi Watanabe, Katsuaki Kodama, Satoshi Iikubo, Shin Ichi Shamoto, Toshio Kamiya, Masahiro Hirano, Hideo Hosono

研究成果: Contribution to journalArticle査読

39 被引用数 (Scopus)

抄録

Electronic and magnetic properties of a layered compound LaMnPO are examined in relation to a newly discovered iso-structural superconductor LaFeAs(P)O. Neutron diffraction measurements, together with temperature dependent magnetic susceptibility, clarify that LaMnPO is an antiferromagnet at least up to 375 K. The spin moment of a Mn ion is determined to be 2.26 μB at room temperature, and the spin configuration is antiparallel in the Mn-P plane and parallel between the Mn-P planes, which is rather different from that of LaFeAsO. Optical absorption spectra, photoemission spectra, and temperature dependent electrical conductivity indicate that LaMnPO is a semiconductor. Furthermore, nominally undoped LaMnPO exhibits n -type conduction while the conduction type is changed by doping of Cu or Ca to the La sites, indicating that LaMnPO is a bipolar conductor. Density functional calculation using the GGA+U approximation supports the above conclusions; the electronic band structure has an open band gap and the antiferromagnetic spin configuration is more stable than the ferromagnetic one.

本文言語英語
論文番号093916
ジャーナルJournal of Applied Physics
105
9
DOI
出版ステータス出版済み - 2009
外部発表はい

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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