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Paramagnetic spin excitations in insulating Rb_(0.8)Fe_(1.6)Se_2

机译:绝缘Rb_(0.8)Fe_(1.6)Se_2中的顺磁自旋激发

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摘要

We use neutron scattering to study temperature-dependent spin excitations in insulating antiferromagnetic (AF) Rb_(0.8)Fe_(1.6)Se_2. In the low-temperature AF state, spin waves can be accurately described by a local moment Heisenberg Hamiltonian. On warming to around the Neel temperature of T_N=500 K, low-energy (E < 30 meV) paramagnetic spin excitations form Lorentzian-like quasielastic peaks centered at the AF wave vectors associated with spin waves, while high-energy (E > 50 meV) spin excitations become heavily damped. Upon further warming to above the structural distortion temperature of T_s = 524 K, the entire paramagnetic excitations become overdamped. These results suggest that AF Rb_0.8Fe_1.6Se_2 is not a copper-oxide-like Mott insulator and has less electron correlations compared with metallic iron pnictides and iron chalcogenides.
机译:我们使用中子散射研究绝缘反铁磁(AF)Rb_(0.8)Fe_(1.6)Se_2中与温度有关的自旋激发。在低温AF状态下,自旋波可以用局部矩Heisenberg哈密顿量精确描述。在升温到T_N = 500 K的Neel温度附近时,低能(E <30 meV)顺磁自旋激发形成以Lorentzian状准弹性峰为中心,其中心与自旋波相关的AF波矢量,而高能(E> 50 meV)自旋激发变得严重衰减。在进一步加热到T_s = 524 K的结构变形温度以上时,整个顺磁激励变得过阻尼。这些结果表明,AF Rb_0.8Fe_1.6Se_2不是类似于氧化铜的Mott绝缘体,并且与金属的磷化铁和硫属元素化物相比,具有较小的电子相关性。

著录项

  • 来源
    《Physical review》 |2013年第6期|064409.1-064409.5|共5页
  • 作者单位

    Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA;

    Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire 0X11 0QX, UK;

    Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA;

    Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA;

    Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    spin waves; neutron spectroscopy; antiferromagnetics; neutron inelastic scattering;

    机译:自旋波中子光谱;反铁磁中子非弹性散射;

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