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首页> 外文期刊>Physical review >Effect of magnetism on lattice dynamics in SrFe_2As_2 using high-resolution inelastic x-ray scattering
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Effect of magnetism on lattice dynamics in SrFe_2As_2 using high-resolution inelastic x-ray scattering

机译：高分辨率非弹性X射线散射对SrFe_2As_2中晶格动力学的影响

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摘要

Phonon spectra of detwinned SrFe_2As_2 crystals, as measured by inelastic x-ray scattering, show clear anisotropy accompanying the magnetostructural transition at 200 K. We model the mode splitting using magnetic DFT calculations, including a phenomenological reduction in force-constant anisotropy that can be attributed to magnetic fluctuations. This serves as a starting point for a general model of phonons in this material applicable to both the antiferromagnetically ordered phase and the paramagnetic phase. Using this model, the measured splitting in the magnetic phase below T_N, and the measured phonon linewidth, we set a lower bound on the mean magnetic fluctuation frequency above T_N at 210 K.
机译：通过非弹性x射线散射测量，解缠的SrFe_2As_2晶体的声子谱显示出清晰的各向异性，伴随着200 K的磁结构跃迁。磁波动。这是该材料中适用于反铁磁有序相和顺磁相的声子一般模型的起点。使用此模型，在T_N以下的磁相中测得的分裂和测得的声子线宽，我们在210 K处在T_N以上的平均磁波动频率上设置了下限。

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  • 来源
    《Physical review》 |2016年第2期|020301.1-020301.5|共5页
  • 作者

    N. Murai; T. Fukuda; T. Kobayashi; M. Nakajima; H. Uchiyama; D. Ishikawa; S. Tsutsui; H. Nakamura; M. Machida; S. Miyasaka; S. Tajima; A. Q. R. Baron;

  • 作者单位

    Materials Dynamics Laboratory, RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan,Department of Physics, Osaka University, 1-1 Machikaneyama-cho, Toyonaka,Osaka 560-0043, Japan;

    Quantum Beam Science Center, Japan Atomic Energy Agency (SPring-8/JAEA), 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan,Materials Dynamics Laboratory, RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan;

    Department of Physics, Osaka University, 1-1 Machikaneyama-cho, Toyonaka,Osaka 560-0043, Japan;

    Department of Physics, Osaka University, 1-1 Machikaneyama-cho, Toyonaka,Osaka 560-0043, Japan;

    Research and Utilization Division, Japan Synchrotron Radiation Research Institute (SPring-8/JASRI), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan,Materials Dynamics Laboratory, RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan;

    Research and Utilization Division, Japan Synchrotron Radiation Research Institute (SPring-8/JASRI), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan,Materials Dynamics Laboratory, RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan;

    Research and Utilization Division, Japan Synchrotron Radiation Research Institute (SPring-8/JASRI), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan;

    Center for Computational Science and e-Systems, Japan Atomic Energy Agency, 178-4-4 Wakashiba, Kashiwa 277-0871, Japan;

    Center for Computational Science and e-Systems, Japan Atomic Energy Agency, 178-4-4 Wakashiba, Kashiwa 277-0871, Japan;

    Department of Physics, Osaka University, 1-1 Machikaneyama-cho, Toyonaka,Osaka 560-0043, Japan;

    Department of Physics, Osaka University, 1-1 Machikaneyama-cho, Toyonaka,Osaka 560-0043, Japan;

    Materials Dynamics Laboratory, RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan,Department of Physics, Osaka University, 1-1 Machikaneyama-cho, Toyonaka,Osaka 560-0043, Japan;

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