X-ray spectroscopic study of BaFeO3 thin films: An Fe4+ ferromagnetic insulator

T. Tsuyama, T. Matsuda, S. Chakraverty, J. Okamoto, E. Ikenaga, A. Tanaka, T. Mizokawa, H. Y. Hwang, Y. Tokura, H. Wadati

研究成果: Article

15 引用 (Scopus)

抜粋

We investigated the electronic and magnetic properties of fully oxidized BaFeO3 thin films, which show ferromagnetic-insulating properties with cubic crystal structure, by hard x-ray photoemission spectroscopy (HAXPES), x-ray absorption spectroscopy (XAS), and soft x-ray magnetic circular dichroism (XMCD). We analyzed the results with configuration-interaction (CI) cluster-model calculations for Fe4+, which showed good agreement with the experimental results. We also studied SrFeO3 thin films, which have an Fe4+ ion helical magnetism in cubic crystal structure, but are metallic at all temperatures. We found that BaFeO3 thin films are insulating with large magnetization (1.7μB/formula unit) under ∼1 T, using valence-band HAXPES and Fe 2p XMCD, which is consistent with the previously reported resistivity and magnetization measurements. Although Fe 2p core-level HAXPES and Fe 2p XAS spectra of BaFeO3 and SrFeO3 thin films are quite similar, we compared the insulating BaFeO3 to metallic SrFeO3 thin films with valence-band HAXPES. The CI cluster-model analysis indicates that the ground state of BaFeO3 is dominated by d5L(L: ligand hole) configuration due to the negative charge transfer energy, and that the band gap has significant O 2p character. We revealed that the differences of the electronic and magnetic properties between BaFeO3 and SrFeO3 arise from the differences in their lattice constants, through affecting the strength of hybridization and bandwidth.

元の言語English
記事番号115101
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
91
発行部数11
DOI
出版物ステータスPublished - 2015 3 2
外部発表Yes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

フィンガープリント X-ray spectroscopic study of BaFeO3 thin films: An Fe4+ ferromagnetic insulator' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用

    Tsuyama, T., Matsuda, T., Chakraverty, S., Okamoto, J., Ikenaga, E., Tanaka, A., Mizokawa, T., Hwang, H. Y., Tokura, Y., & Wadati, H. (2015). X-ray spectroscopic study of BaFeO3 thin films: An Fe4+ ferromagnetic insulator. Physical Review B - Condensed Matter and Materials Physics, 91(11), [115101]. https://doi.org/10.1103/PhysRevB.91.115101