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In-plane spin excitation anisotropy in the paramagnetic state of NaFeAs

机译:NaFeAs顺磁性状态下的面内自旋激发各向异性

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摘要

We use unpolarized and polarized inelastic neutron scattering to study low-energy spin excitations in NaFeAs, which exhibits a tetragonal-to-orthorhombic lattice distortion at T_s ≈ 58 K followed by a collinear antiferromagnetic (AF) order below T_N ≈ 45 K. In the AF ordered state (T < T_N), spin waves are entirely c-axis polarized below ~10 meV, exhibiting a gap of ~4 meV at the AF zone center and disperse to ~7 meV near the c-axis AF zone boundary. On warming to the paramagnetic state with orthorhombic lattice distortion (T_N < T < T_s), spin excitations become anisotropic within the FeAs plane. Upon further warming to the paramagnetic tetragonal state (T> T_s), spin excitations become more isotropic. Since similar magnetic anisotropy is also observed in the paramagnetic tetragonal phase of superconducting BaFe_(1.904)Ni_(0.096)As_2, our results suggest that the spin excitation anisotropy in superconducting iron pnictides originates from similar anisotropy already present in their parent compounds.
机译:我们使用非极化和极化非弹性中子散射来研究NaFeAs中的低能自旋激发,其在T_s≈58 K时呈现出四方到正交的晶格畸变,然后在T_N≈45 K以下出现共线反铁磁(AF)阶。 AF有序状态(T <T_N),自旋波在〜10 meV以下完全被c轴极化,在AF区域中心出现约4 meV的间隙,并在c轴AF区域边界附近扩散到〜7 meV。当加热到具有正交晶格畸变(T_N <T <T_s)的顺磁态时,自旋激发在FeAs平面内变为各向异性。随着进一步升温至顺磁性四方状态(T> T_s),自旋激发变得更加各向同性。由于在超导BaFe_(1.904)Ni_(0.096)As_2的顺磁性四方相中也观察到了相似的磁各向异性,因此我们的结果表明,超导铁素体中的自旋激发各向异性源于其母体化合物中已经存在的相似各向异性。

著录项

  • 来源
    《Physical review》 |2013年第13期|134512.1-134512.6|共6页
  • 作者单位

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA,Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA;

    SPSMS-MDN, UMR-E CEA/UJF'-Grenoble 1,INAC, Grenoble, F-38054, France;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, 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;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA,Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

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

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, 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;

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

    magnetic anisotropy; neutron inelastic scattering;

    机译:磁各向异性中子非弹性散射;

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