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Correlated impurities and intrinsic spin-liquid physics in the kagome material herbertsmithite

机译:戈戈姆材料黑铁矿中的相关杂质和内在自旋液体物理学

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摘要

Low energy inelastic neutron scattering on single crystals of the kagome spin-liquid compound ZnCu_3(OD)_6Cl_2 (herbertsmithite) reveals antiferromagnetic correlations between impurity spins for energy transfers hω < 0.8 meV (~J/20). The momentum dependence differs significantly from higher energy scattering which arises from the intrinsic kagome spins. The low energy fluctuations are characterized by diffuse scattering near wave vectors (100) and (00 3/2), which is consistent with antiferromagnetic correlations between pairs of nearest-neighbor Cu impurities on adjacent triangular (Zn) interlayers. The corresponding impurity lattice resembles a simple cubic lattice in the dilute limit below the percolation threshold. Such an impurity model can describe prior neutron, NMR, and specific heat data. The low energy neutron data are consistent with the presence of a small spin gap (Δ ~ 0.7 meV) in the kagome layers, similar to that recently observed by NMR. The ability to distinguish the scattering due to Cu impurities from that of the planar kagome Cu spins provides an important avenue for probing intrinsic spin-liquid physics.
机译:kagome自旋-液体化合物ZnCu_3(OD)_6Cl_2(铁矾)的单晶上的低能非弹性中子散射揭示了杂质自旋之间能量传递的反铁磁相关性hω<0.8 meV(〜J / 20)。动量依赖性与固有的kagome自旋产生的较高的能量散射明显不同。低能量波动的特征在于波矢量(100)和(00 3/2)附近的漫散射,这与相邻三角形(Zn)中间层上的最邻近的Cu杂质对之间的反铁磁相关性一致。相应的杂质晶格在渗滤阈值以下的稀释极限中类似于简单的立方晶格。这样的杂质模型可以描述先验中子,NMR和比热数据。低能中子数据与kagome层中存在小的自旋间隙(Δ〜0.7 meV)相一致,这与最近通过NMR观察到的相似。区分由于铜杂质和平面kagome铜自旋引起的散射的能力为探测内在自旋液体物理学提供了一条重要途径。

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  • 来源
    《Physical review》 |2016年第6期|060409.1-060409.5|共5页
  • 作者单位

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA,James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA;

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Department of Applied Physics, Stanford University, Stanford, California 94305, USA,Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA,Department of Materials Science, University of Maryland, College Park, Maryland 20742, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA,Department of Physics, The United States Naval Academy, Annapolis, Maryland 21402, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA,Institute for Quantum Matter and Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA;

    Department of Applied Physics, Stanford University, Stanford, California 94305, USA,Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

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