Scholarlink

<p>We investigated <i>S</i> = 2 quasi-two-dimensional XY Heisenberg antiferromagnets Ba<sub>2</sub>FeSi<sub>2</sub>O<sub>7</sub> (BFSO) and Sr<sub>2</sub>FeSi<sub>2</sub>O<sub>7</sub> (SFSO) using the Fe <i>L</i><sub>2,3</sub>-edge X-ray linear dichroism (XLD). The XLD spectrums exhibit nearly identical spectral line shapes with small variations for BFSO and SFSO, which form isostructural square-lattice magnetic networks of compressed FeO<sub>4</sub> (<i>d</i><sup>6</sup>) tetrahedrons. For the XLD line shape analysis, we performed the full multiplet cluster model calculations and successfully reproduced not only the spectral line shape but also small variations through different degrees of the compressive distortion for BFSO and SFSO. The model calculations confirm that the <i>S</i> = 2 <sup>5</sup>E<sub>g</sub> (<i>t</i><sub>2g</sub><sup>3</sup><i>e</i><sub>g</sub><sup>3</sup>) state is split into <i>S</i><sub><i>z</i></sub> = 0, ± 1, and ± 2 by the spin–orbit coupling. In the analysis, we found that the splitting energy <i>D</i>, denoted as the single-ion magnetic anisotropy energy of the order of 1&#xa0;meV scale, varies with the degree of the distortion and determined <i>D</i><sub>BFSO</sub> = 1.45&#xa0;meV and <i>D</i><sub>SFSO</sub> = 1.22&#xa0;meV.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

X-ray linear dichroism study on S = 2 antiferromagnets Ba2FeSi2O7 and Sr2FeSi2O7: determination of single-ion magnetic anisotropy energies

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月23日

查看全文
  • Jong-Hyeok Choi,
  • Dae-Hyeon Bahng,
  • Tae-Hwan Jang,
  • Jae-Hoon Park

摘要

We investigated S = 2 quasi-two-dimensional XY Heisenberg antiferromagnets Ba2FeSi2O7 (BFSO) and Sr2FeSi2O7 (SFSO) using the Fe L2,3-edge X-ray linear dichroism (XLD). The XLD spectrums exhibit nearly identical spectral line shapes with small variations for BFSO and SFSO, which form isostructural square-lattice magnetic networks of compressed FeO4 (d6) tetrahedrons. For the XLD line shape analysis, we performed the full multiplet cluster model calculations and successfully reproduced not only the spectral line shape but also small variations through different degrees of the compressive distortion for BFSO and SFSO. The model calculations confirm that the S = 2 5Eg (t2g3eg3) state is split into Sz = 0, ± 1, and ± 2 by the spin–orbit coupling. In the analysis, we found that the splitting energy D, denoted as the single-ion magnetic anisotropy energy of the order of 1 meV scale, varies with the degree of the distortion and determined DBFSO = 1.45 meV and DSFSO = 1.22 meV.