Generalized longitudinal susceptibility for magnetic monopoles in spin ice.
Generalized longitudinal susceptibility for magnetic monopoles in spin ice.
复制标题
旋转冰中磁性单孔的纵向敏感性。
DOI：
10.1098/rsta.2011.0596
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发表时间：
2012-12-28
期刊：
影响因子：
--
通讯作者：
Bramwell ST
中科院分区：
文献类型：
--
作者：
Bramwell ST
广义纵向磁化率χ（q，ω）提供了自旋冰中磁单极子空间和时间相关性的灵敏度量。本文从非线性模型出发，导出了χ（q，ω）的平均场表达式，以及一点的均方纵向场和感应强度的表达式。单极运动被证明是强相关的，和空间和时间的相关性控制的无量纲磁致伸缩密度x定义的磁化弛豫率和磁跳率的比率。热效应和自旋晶格弛豫也被认为是。导出的方程适用于磁单极子的维恩效应可以忽略的温度范围。它们是在现有的自旋冰理论和以下实验技术的背景下进行讨论：直流和交流磁化，中子散射，中子自旋回波和纵向和横向场μSR。的理论被发现统一不同的实验结果，但理论和实验之间的一些差异被确定。其中之一，关于中子散射线的形状，是通过一个唯象的理论修改解释。
The generalized longitudinal susceptibility χ(q,ω) affords a sensitive measure of the spatial and temporal correlations of magnetic monopoles in spin ice. Starting with the monopole model, a mean field expression for χ(q,ω) is derived as well as expressions for the mean square longitudinal field and induction at a point. Monopole motion is shown to be strongly correlated, and both spatial and temporal correlations are controlled by the dimensionless monopole density x which defines the ratio of the magnetization relaxation rate and the monopole hop rate. Thermal effects and spin-lattice relaxation are also considered. The derived equations are applicable in the temperature range where the Wien effect for magnetic monopoles is negligible. They are discussed in the context of existing theories of spin ice and the following experimental techniques: DC and AC magnetization, neutron scattering, neutron spin echo and longitudinal and transverse field μSR. The monopole theory is found to unify diverse experimental results, but several discrepancies between theory and experiment are identified. One of these, concerning the neutron scattering line shape, is explained by means of a phenomenological modification to the theory.
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