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首页> 外文期刊>Physical review >Structural, electrical, magnetic, and optical properties of iron-based ladder compounds BaFe_2(S_(1-x)Se_x)_3
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Structural, electrical, magnetic, and optical properties of iron-based ladder compounds BaFe_2(S_(1-x)Se_x)_3

机译：铁基梯形化合物Bafe_2的结构，电，磁性和光学性质（S_（1-x）SE_x）_3

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摘要

We performed a comprehensive study on structural, electrical, magnetic, and optical properties for iron-based ladder materials BaFe_2(S_(1-x)Se_x)_3 (0 ≤ ⅹ ≤ 1). which shows pressure-induced superconductivity in the vicinity of the Mott transition at ⅹ = 0 and 1. We obtain a complete electronic phase diagram in a temperature-composition plane, which reveals that the magnetic ground state switches from the stripe-type to the block-type phase without any intermediate phase at ⅹ = 0.23 with increasing x. This behavior is in sharp contrast to the filling controlled system Ba_(1-x) Cs_xFe_2Se_3, in which a paramagnetic state down to the lowest temperature is realized between two magnetic ordered states. The structural transition, which is considered to be relevant to the orbital order, occurs far above the magnetic transition temperature. The magnetic and structural transition temperatures exhibit a similar composition dependence, indicating a close relationship between magnetic and orbital degrees of freedom. In addition, we found that charge dynamics are considerably influenced not only by the magnetic order but also by the structural change (orbital order) from the detailed measurements of electrical resistivity and optical conductivity spectra. We discuss the magnetism and orbital order by comparing the experimental results with the proposed theory based on the multiorbital Hubbard model. The relationship between the charge dynamics and the magnetic/orbital order is also discussed.
机译：我们对铁梯材料Bafe_2（S_（1-x）Se_x）_3（0≤ⅹ≤1）的结构，电磁性和光学性能进行了全面的研究。其显示在ⅹ= 0和1的Mott转变附近的压力诱导的超导性。我们在温度 - 成分平面中获得完整的电子相图，这揭示了磁场态从条纹转换到块的切换-Type期没有任何中间相的χ= 0.23，随着X增加。这种行为与填充控制系统BA_（1-X）CS_XFE_2SE_3鲜明对比，其中在两个磁有序状态之间实现了下降到最低温度的顺磁状态。被认为与轨道顺序相关的结构转变远远超过磁转变温度。磁性和结构转变温度表现出类似的组成依赖性，表明磁性和轨道自由度之间的密切关系。此外，我们发现电荷动力学不仅受到磁场的影响，而且通过来自电阻率和光导谱的详细测量的结构变化（轨道顺序）。通过将实验结果与基于多部会隆巴德模型的建议理论进行比较，我们讨论磁性和轨道顺序。还讨论了充电动力学和磁/轨道顺序之间的关系。

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  • 来源
    《Physical review》 |2020年第3期|035104.1-035104.13|共13页
  • 作者

    Satoshi Imaizumi; Takuya Aoyama; Ryota Kimura; Koya Sasaki; Yusuke Nambu; Maxim Avdeev; Yasuyuki Hirata; Yuka Ikemoto; Taro Moriwaki; Yoshinori Imai; Kenya Ohgushi;

  • 作者单位

    Department of Physics School of Science Tohoku University 6-3 Aramaki-Aoba Aoba-ku Sendai Miyagi 980-8578 Japan;

    Department of Physics School of Science Tohoku University 6-3 Aramaki-Aoba Aoba-ku Sendai Miyagi 980-8578 Japan;

    Department of Physics School of Science Tohoku University 6-3 Aramaki-Aoba Aoba-ku Sendai Miyagi 980-8578 Japan;

    Department of Physics School of Science Tohoku University 6-3 Aramaki-Aoba Aoba-ku Sendai Miyagi 980-8578 Japan;

    Institute for Materials Research Tohoku University Sendai Miyagi 980-8577 Japan;

    Australian Nuclear Science and Technology Organisation New Illawarra Road Lucas Heights New South Wales 2234 Australia School of Chemistry The University of Sydney Sydney 2006 Australia;

    Department of Applied Physics School of Science and Engineering National Defense Academy Hashirimizu 1-10-20 Yokosuka Kanagawa 239-8686 Japan;

    Japan Synchrotron Radiation Institute SPring-8 Sayo Hyogo 679-5198 Japan;

    Japan Synchrotron Radiation Institute SPring-8 Sayo Hyogo 679-5198 Japan;

    Department of Physics School of Science Tohoku University 6-3 Aramaki-Aoba Aoba-ku Sendai Miyagi 980-8578 Japan;

    Department of Physics School of Science Tohoku University 6-3 Aramaki-Aoba Aoba-ku Sendai Miyagi 980-8578 Japan;

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