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<p>Perovskite oxides SrTiO<sub>3</sub> (STO) doped with 1 at % <sup>57</sup>Fe and small amounts of Sn at the Ti sites were prepared by thermal decomposition of a mixed metal complex. The co-doped STO were characterized by powder X-ray diffraction, magnetometry, and <sup>57</sup>Fe Mössbauer spectrometry. At first glance, the room temperature Mössbauer spectra consist of two paramagnetic components and a magnetic relaxation component. However, it is found that low temperature Mössbauer spectra show two magnetic relaxation components with about 50&#xa0;T and 20&#xa0;T in addition to two paramagnetic peaks. Temperature dependency of the magnetization curve showed an unusual behavior. It is considered that clusters with oxygen vacancy, two Fe<sup>3+</sup> atoms, and/or two Sn<sup>4+</sup> atoms in unit cell were formed, leading to long-range magnetic ordering through the clusters.</p>

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57Fe Mössbauer spectrometry on SrTiO3−δ perovskite oxides co-doped with dilute Fe and Sn

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Nomura Kiyoshi,
  • Masashi Takahashi,
  • Kokubo Hiroko,
  • Takashi Naka,
  • Yasuhiro Kobayashi,
  • Yuika Yoshimura,
  • Yuya Koike,
  • Shiro Kubuki,
  • Jun Okabayashi,
  • Cesar Barrero

摘要

Perovskite oxides SrTiO3 (STO) doped with 1 at % 57Fe and small amounts of Sn at the Ti sites were prepared by thermal decomposition of a mixed metal complex. The co-doped STO were characterized by powder X-ray diffraction, magnetometry, and 57Fe Mössbauer spectrometry. At first glance, the room temperature Mössbauer spectra consist of two paramagnetic components and a magnetic relaxation component. However, it is found that low temperature Mössbauer spectra show two magnetic relaxation components with about 50 T and 20 T in addition to two paramagnetic peaks. Temperature dependency of the magnetization curve showed an unusual behavior. It is considered that clusters with oxygen vacancy, two Fe3+ atoms, and/or two Sn4+ atoms in unit cell were formed, leading to long-range magnetic ordering through the clusters.