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Spin gap and magnetic resonance in superconducting BaFe_(1.9)Ni_(0.1)As_2

机译:BaFe_(1.9)Ni_(0.1)As_2超导中的自旋间隙和磁共振

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摘要

We use neutron spectroscopy to determine the nature of the magnetic excitations in superconducting BaFe_(1.9)Ni_(0.1)As_2(T_c = 20 K). Above T_c the excitations are gapless and centered at the commensurate antiferro-magnetic wave vector of the parent compound, while the intensity exhibits a sinusoidal modulation along the c axis. As the superconducting state is entered a spin gap gradually opens, whose magnitude tracks the T dependence of the superconducting gap as observed by angle-resolved photoemission. Both the spin-gap and magnetic-resonance energies are temperature and wave-vector dependent, but their ratio is the same within uncertainties. These results suggest that the spin resonance is a singlet-triplet excitation related to electron pairing and superconductivity.
机译:我们使用中子光谱法确定超导BaFe_(1.9)Ni_(0.1)As_2(T_c = 20 K)中磁激发的性质。在T_c以上,激发是无间隙的,并以母体化合物的相应反铁磁波矢量为中心,而强度沿c轴显示正弦调制。随着进入超导状态,自旋间隙逐渐打开,自旋间隙的大小跟踪超导间隙的T依赖性,如通过角度分辨的光发射观察到的。自旋间隙和磁共振能量均与温度和波矢量有关,但是在不确定性内它们的比率相同。这些结果表明,自旋共振是与电子配对和超导性有关的单重态-三重态激发。

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  • 来源
    《Physical review》 |2009年第17期|174527.1-174527.5|共5页
  • 作者单位

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

    NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA;

    Department of Physics, Zhejiang University, Hangzhou 310027, China;

    Department of Physics, Zhejiang University, Hangzhou 310027, China;

    Department of Physics, Zhejiang University, Hangzhou 310027, China;

    Department of Physics, Zhejiang University, Hangzhou 310027, China;

    Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA;

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

    magnetic properties; electronic structure; neutron inelastic scattering;

    机译:磁性电子结构中子非弹性散射;

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