2007/11/29 by M. Kobayashi, Masaki Kobayashi, J. I. Hwang +18
Materials Science · Physics and Astronomy · #Copper-based nanomaterials and applications #Electronic and Structural Properties of Oxides #ZnO doping and properties #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.78.155322
published as Phys. Rev. B 78, 155322 (2008) · 5 pages, 3 figures
arxiv created 2007/11/29 · openalex publication_date 2008/10/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The electronic structure of Li-doped Ni_1\ensuremath-xFexO 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 Fe3+ intensity increased with Li doping relative to the Fe2+ intensity. However, the increase in Fe3+ is only \ensuremath∼5% of the doped Li content, suggesting that most of the doped holes enter the O 2p and/or the charge-transferred configuration Ni 3d8\underseṯL. 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.