Determination of valence state of Mn ions in Pr 1-xA xMnO 3-δ (A = Ca, Sr) by Mn-L 3 X-ray absorption near-edge structure analysis

Haruto Kanamori, Tsuyoshi Yoshioka, Kazuyuki Hirose, Tomoyuki Yamamoto*

*この研究の対応する著者

研究成果: Article査読

4 被引用数 (Scopus)

抄録

The valence states of the Mn ions in Pr 1-xA xMnO 3-δ (A = Ca, Sr) are investigated by Mn-L 3 X-ray absorption near-edge structure (XANES) analysis. The spectral fine structures in the Mn-L 3 XANES analysis show a significant difference between Pr 0.5Ca 0.5MnO 3-δ and Pr 0.5Sr 0.5MnO 3-δ, a paramagnetic insulator and a ferromagnetic metal, respectively, at room temperature, whereas the spectral structures of Pr 0.7Ca 0.3MnO 3-δ and Pr 0.7Sr 0.3MnO 3-δ, paramagnetic insulators, are almost identical. These results indicate that the valence states of the Mn ions in these materials are highly correlated with their magnetic and electrical properties. A significant difference was also found between the Mn-L 3 XANES profiles of Pr 1-xCa xMnO 3-δ and the profiles formed by the linear combination of the Mn-L 3 XANES spectra of PrMnO 3 (Mn 3+) and CaMnO 3 (Mn 4+). This difference indicates that the Mn ions in these materials do not have a mixed-valence state of 3+ and 4+, but have an intermediate valence state o 3+ and 4+.

本文言語English
ページ(範囲)129-132
ページ数4
ジャーナルJournal of Electron Spectroscopy and Related Phenomena
185
5-7
DOI
出版ステータスPublished - 2012 8 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 放射線
  • 原子分子物理学および光学
  • 凝縮系物理学
  • 分光学
  • 物理化学および理論化学

フィンガープリント

「Determination of valence state of Mn ions in Pr <sub>1-x</sub>A <sub>x</sub>MnO <sub>3-δ</sub> (A = Ca, Sr) by Mn-L <sub>3</sub> X-ray absorption near-edge structure analysis」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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