ヤマガミ ヒロシ   YAMAGAMI HIROSHI
  山上 浩志
   所属   京都産業大学  理学部 物理科学科
   職種   教授
言語種別 英語
発行・発表の年月 2008/10
形態種別 研究論文
標題 Systematic changes of the electronic structure of the diluted ferromagnetic oxide Li-doped Ni(1-x)Fe(x)O with hole doping
執筆形態 その他
掲載誌名 PHYSICAL REVIEW B
出版社・発行元 AMER PHYSICAL SOC
巻・号・頁 78(15)
著者・共著者 M. Kobayashi,J. I. Hwang,G. S. Song,Y. Ooki,M. Takizawa,A. Fujimori,Y. Takeda,S. -I. Fujimori,K. Terai,T. Okane,Y. Saitoh,H. Yamagami,Y. -H. Lin,C. -W. Nan
概要 The electronic structure of Li-doped Ni(1-x)Fe(x)O has been investigated using photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). The Ni 2p core-level PES and XAS spectra were not changed by Li doping. In contrast, the Fe(3+) intensity increased with Li doping relative to the Fe(2+) intensity. However, the increase in Fe(3+) is only similar to 5% of the doped Li content, suggesting that most of the doped holes enter the O 2p and/or the charge-transferred configuration Ni 3d(8)L_. The Fe 3d partial density of states and the host valence-band emission near the valence-band maximum increased with Li content, consistent with the increase in electrical conductivity. Based on these findings, percolation of bound magnetic polarons is proposed as an origin of the ferromagnetic behavior.
DOI 10.1103/PhysRevB.78.155322
ISSN 1098-0121