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首页> 外文期刊>Physical review >Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe_(1.85)Ni_(0.15)As_2
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Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe_(1.85)Ni_(0.15)As_2

机译：电子掺杂超导BaFe_（1.85）Ni_（0.15）As_2中磁激发的极化中子散射研究

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摘要

We use polarized inelastic neutron scattering to study low-energy spin excitations and their spatial anisotropy in electron-overdoped superconducting BaFe_(1.85)Ni_(0.15)As_2 (T_c = 14 K). In the normal state, the imaginary part of the dynamic susceptibility χ"(Q,ω) at the antiferromagnetic wave vector Q = (0.5,0.5,1) increases linearly with energy for E ≤ 13 meV. Upon entering the superconducting state, a spin gap opens below E ≈ 3 meV and a broad neutron spin resonance appears at E ≈ 7 meV. Our careful neutron polarization analysis reveals that χ"(Q,ω) is isotropic for the in-plane and out-of-plane components in both the normal and superconducting states. A comparison of these results with those of undoped BaFe_2As_2 and optimally electron-doped BaFe_(1.9)Ni_(0.1)As_2 (T_c = 20 K) suggests that the spin anisotropy observed in BaFe_(1.9)Ni_(0.1)As_2 is likely due to its proximity to the undoped BaFe_2As_2. Therefore, the neutron spin resonance is mostly isotropic in the optimal and electron overdoped iron pnictides, consistent with a singlet to triplet excitation and isotropic paramagnetic scattering.
机译：我们使用极化非弹性中子散射来研究低电子自旋激发及其在电子掺杂超导BaFe_（1.85）Ni_（0.15）As_2（T_c = 14 K）中的空间各向异性。在正常状态下，反铁磁波矢量Q =（0.5,0.5,1）处的动态磁化率χ“（Q，ω）的虚部随着E≤13 meV的能量线性增加。进入超导状态时，自旋间隙在E≈3 meV以下打开，在E≈7 meV处出现中子自旋共振。我们仔细的中子极化分析表明，对于X轴上的面内和面外分量，χ“（Q，ω）是各向同性的无论是正常状态还是超导状态。将这些结果与未掺杂BaFe_2As_2和最佳电子掺杂BaFe_（1.9）Ni_（0.1）As_2（T_c = 20 K）的结果进行比较，表明在BaFe_（1.9）Ni_（0.1）As_2中观察到的自旋各向异性可能是由于它与未掺杂的BaFe_2As_2接近。因此，中子自旋共振在最佳态和电子过量掺杂的铁素体中大多是各向同性的，这与单重态至三重态激发和各向同性顺磁散射一致。

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  • 来源
    《Physical review》 |2012年第21期|p.214516.1-214516.7|共7页
  • 作者

    Mengshu Liu; C. Lester; Jiri Kulda; Xinye Lu; Huiqian Luo; Meng Wang; S. M. Hayden; Pengcheng Dai;

  • 作者单位

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

    H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom;

    Institut Laue-Langevin, 6, rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France;

    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;

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

    H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom;

    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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  • 正文语种 eng
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  • 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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