Enhanced magnetism of perovskite oxides, Sr(Sn,Fe)O3-δ, by substitution of nonmagnetic Ca and Ti ions

Kiyoshi Nomura*, Shigeyo Suzuki, Tomoya Mizunuma, Yuya Koike, Atsushi Okazawa

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Magnetic properties of perovskite oxides, SrSn1-xFexO3-δ (x ≤ 0.15), substituted with nonmagnetic Ca and Ti ions were studied. XRD patterns showed the orthorhombic structure (close to tetragonal) of (Sr1-yCay)(Sn1-xFex)O3-δ and Sr(Sn1-x-yFexTiy)O3-δ. The cell volumes decreased with the increase of Ca and Ti doping rates. Although Ti-substituted Sr(Sn, Fe)O3-δ showed small saturation magnetizations as compared with non-Ti substituted one, the magnetization increased a little with Ti doping rates up to 15%. On the other hand, all Ca-substituted Sr(Sn, Fe)O3-δ showed larger saturation magnetization than non-Ca substituted one. Two doublets of Fe3+ and a doublet of Fe4+ were observed in Mössbauer spectra of Ca-substituted Sr(Sn, Fe)O3-δ with weak ferromagnetism, and two sextets of high spin Fe3+ were additionally observed in Mössbauer spectra of Ca-doped Sr(Sn, Fe)O3-δ with relatively strong ferromagnetism. When Sr(Sn, Fe)O3-δ were further codoped with Ca and Ti ions, they showed the stable and enhanced ferromagnetic properties. It is considered that magnetic polarons among high spin Fe3+ species are overlapped by shrinking or deforming the crystal structure of perovskite oxides. That is the magnetism induced by a chemical pressure of perovskite oxides.

本文言語English
論文番号81
ジャーナルHyperfine Interactions
238
1
DOI
出版ステータスPublished - 2017 11月 1
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ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 核物理学および高エネルギー物理学
  • 凝縮系物理学
  • 物理化学および理論化学

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