Theory of inelastic neutron scattering in a field-induced spin-nematic state
Theory of inelastic neutron scattering in a field-induced spin-nematic state
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场致自旋向列态非弹性中子散射理论
DOI：
10.1103/physrevb.91.174402
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发表时间：
2015
影响因子：
3.7
通讯作者：
Nic Shannon
中科院分区：
文献类型：
--
作者：
Andrew Smerald;Hiroaki T. Ueda;Nic Shannon
我们发展了一个场致自旋-自旋态的自旋激发理论，并用它来说明如何利用非弹性中子散射来确定自旋-自旋序。我们专注于二维受抑铁磁体，其中一个两个子晶格，键心自旋自旋态被预测存在于一个很宽的参数范围内。首先，为了阐明自旋激发的性质，我们引入了一个可溶的自旋1模型，并利用它导出了一个适用于任何两个子晶格自旋激发态的连续统场论。然后，我们参数化这个领域的理论，使用图解计算一个现实的微观模型的自旋受挫铁磁体，并显示它如何可以用来预测非弹性中子散射。作为一个例子，我们展示了定量预测中子的非弹性散射，一个有前途的候选人，实现一个自旋-自旋态在可接受的T。我们表明，在这种材料中，它是现实的，期望一个幽灵般的戈德斯通模式，信号自旋自旋有序，在实验中可见。
We develop a theory of spin excitations in a field-induced spin-nematic state, and use it to show how a spin-nematic order can be indentified using inelastic neutron scattering. We concentrate on two-dimensional frustrated ferromagnets, for which a two-sublattice, bond-centered spin-nematic state is predicted to exist over a wide range of parameters. First, to clarify the nature of spin-excitations, we introduce a soluble spin-1 model, and use this to derive a continuum field theory, applicable to any two-sublattice spin-nematic state. We then parameterize this field theory, using diagrammatic calculations for a realistic microscopic model of a spin-frustrated ferromagnet, and show how it can be used to make predictions for inelastic neutron scattering. As an example, we show quantitative predictions for inelastic scattering of neutrons from, a promising candidate to realize a spin-nematic state at an achievableT. We show that in this material it is realistic to expect a ghostly Goldstone mode, signalling spin-nematic order, to be visible in experiment.