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Polarized neutron scattering studies of the kagome lattice antiferromagnet KFe3(OH)(6)(SO4)(2)

机译:kagome晶格反铁磁体KFe3(OH)(6)(SO4)(2)的极化中子散射研究

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We report polarized neutron scattering studies of spin-wave excitations and spin fluctuations in the S = 5/2 kagome lattice antiferromagnet KFe3(OH)(6)(SO4)(2) (jarosite). Inelastic polarized neutron scattering measurements at 10 K on a single crystal sample reveal two spin gaps, associated with in-plane and out-of-plane excitations. The polarization analysis of quasi-elastic scattering at 67 K shows in-plane spin fluctuations with XY symmetry, consistent with the disappearance of the in-plane gap above the Neel temperature T-N = 65 K. Our results suggest that jarosite is a promising candidate for studying the 2D XY universality class in magnetic systems.
机译:我们报告极化中子散射的自旋波激发和S = 5/2 kagome晶格反铁磁体KFe3(OH)(6)(SO4)(2)(黄铁矿)中的自旋波动的研究。在单晶样品上以10 K进行的非弹性极化中子散射测量显示出两个自旋间隙,与平面内和平面外激发相关。在67 K处的准弹性散射的极化分析显示,具有XY对称性的面内自旋涨落,与Neel温度TN = 65 K以上的面内间隙的消失一致。我们的结果表明,黄钾铁矾是一种有希望的候选物研究磁性系统中的2D XY通用性类。

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