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<p>Raman spectra have been measured in polycrystalline samples of La<sub>0.5</sub>Sr<sub>0.5</sub>FeO<sub>3–δ</sub> and SrFeO<sub>2.5</sub> antiferromagnetic orthoferrites in the orthorhombic and brownmillerite phases, respectively, in the temperature range of 300–700 K. A significant decrease in the intensity of the 1300–1400 cm<sup>–1</sup> band when approaching the Néel temperature (<i>T</i><sub>N</sub> ~ 410 K in the substituted orthoferrite La<sub>0.5</sub>Sr<sub>0.5</sub>FeO<sub>3–δ</sub> and <i>T</i><sub>N</sub> ~ 670 K in the brownmillerite SrFeO<sub>2.5</sub>) indicates magnetic ordering in the crystals under normal conditions, and the band itself is due to two-magnon scattering, in contrast to the ~1100-cm<sup>–1</sup> biphonon scattering band, which retains its intensity over the entire temperature range.</p>

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Two-Magnon Raman Scattering in Strontium Orthoferrites

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  • 发表日期：

    2025年10月1日

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  • S. V. Zaitsev,
  • V. D. Sedykh,
  • K. P. Meletov

摘要

Raman spectra have been measured in polycrystalline samples of La0.5Sr0.5FeO3–δ and SrFeO2.5 antiferromagnetic orthoferrites in the orthorhombic and brownmillerite phases, respectively, in the temperature range of 300–700 K. A significant decrease in the intensity of the 1300–1400 cm–1 band when approaching the Néel temperature (TN ~ 410 K in the substituted orthoferrite La0.5Sr0.5FeO3–δ and TN ~ 670 K in the brownmillerite SrFeO2.5) indicates magnetic ordering in the crystals under normal conditions, and the band itself is due to two-magnon scattering, in contrast to the ~1100-cm–1 biphonon scattering band, which retains its intensity over the entire temperature range.