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<p>SmFe<sub>3 –</sub> <sub><i>x</i></sub>Al<sub><i>x</i></sub>(BO<sub>3</sub>)<sub>4</sub> multiferroic single crystals with <i>x</i> = 0–0.28 have been studied in the temperature range <i>T</i> = 3.8−298 K using <sup>57</sup>Fe Mössbauer spectroscopy and X-ray diffraction analysis. An increase in the Mössbauer hyperfine quadrupole splitting with the content of aluminum <i>x</i> impurities has been found. For all studied samples, the Mössbauer Debye temperatures Θ<sub>M</sub> of iron ions have been determined in good agreement with the values for iron ions calculated from X-ray diffraction data. It has been shown that the low-temperature Mössbauer spectral lines of single crystals doped with Al in a magnetically ordered state are broadened compared to the corresponding lines of the undoped SmFe<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub> ferroborate; this broadening is best approximated within the multilevel spin relaxation model. The Néel temperatures <i>T</i><sub>N</sub> of the magnetic phase transition have been determined for all studied SmFe<sub>3 –</sub> <sub><i>x</i></sub>Al<sub><i>x</i></sub>(BO<sub>3</sub>)<sub>4</sub> samples. It has been (found that the Néel temperature <i>T</i><sub>N</sub> decreases nonlinearly with an increase in the content <i>x</i> of aluminum, and the type of three-dimensional magnetic ordering changes from planar to Ising.</p>

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57Fe Mössbauer Spectroscopy Study of SmFe3 – xAlx(BO3)4 (x = 0–0.28) Multiferroics

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • K. V. Frolov,
  • E. S. Smirnova,
  • E. V. Sidorova,
  • O. A. Alekseeva,
  • I. A. Gudim

摘要

SmFe3 – xAlx(BO3)4 multiferroic single crystals with x = 0–0.28 have been studied in the temperature range T = 3.8−298 K using 57Fe Mössbauer spectroscopy and X-ray diffraction analysis. An increase in the Mössbauer hyperfine quadrupole splitting with the content of aluminum x impurities has been found. For all studied samples, the Mössbauer Debye temperatures ΘM of iron ions have been determined in good agreement with the values for iron ions calculated from X-ray diffraction data. It has been shown that the low-temperature Mössbauer spectral lines of single crystals doped with Al in a magnetically ordered state are broadened compared to the corresponding lines of the undoped SmFe3(BO3)4 ferroborate; this broadening is best approximated within the multilevel spin relaxation model. The Néel temperatures TN of the magnetic phase transition have been determined for all studied SmFe3 – xAlx(BO3)4 samples. It has been (found that the Néel temperature TN decreases nonlinearly with an increase in the content x of aluminum, and the type of three-dimensional magnetic ordering changes from planar to Ising.