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Magnetic excitations in a new anisotropic kagome antiferromagnet

机译：新型各向异性kagome反铁磁体中的磁激发

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摘要

The Nd-langasite compound contains planes of magnetic Nd3+ ions on a lattice topologically equivalent to a kagome net. The magnetic susceptibility does not reveal any signature of long-range ordering down to 2 K but rather a correlated paramagnetism with significant antiferromagnetic interactions between the Nd and a single-ion anisotropy due to crystal field effect. Inelastic neutron scattering on Nd-langasite powder and single crystal allowed to probe its very peculiar low temperature dynamical magnetic correlations. They present unusual dispersive features and are broadly localized in wave vector Q revealing a structure factor associated to characteristics short-range correlations between the magnetic atoms. From comparison with theoretical calculations, these results are interpreted as a possible experimental observation of a spin-liquid state in an anisotropic kagome antiferromagnet. (c) 2006 Elsevier B.V. All rights reserved.
机译：Nd-铜硅石化合物在拓扑上等同于kagome网络的晶格中包含磁性Nd3 +离子的平面。磁化率并没有显示出低至2 K的长程有序信号，而是具有相关的顺磁性，并且由于晶场效应，Nd和单离子各向异性之间具有明显的反铁磁相互作用。在钕铁硼硅石粉末和单晶上的非弹性中子散射可以探测其非常独特的低温动态磁相关性。它们表现出不寻常的色散特征，并广泛地位于波矢量Q中，揭示出与磁性原子之间的特征短程相关性相关的结构因子。通过与理论计算的比较，这些结果被解释为各向异性的Kagome反铁磁体中自旋液体状态的可能实验观察。 （c）2006 Elsevier B.V.保留所有权利。

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