Scaling ansatz for the ac magnetic response in two-dimensional spin ice
Scaling ansatz for the ac magnetic response in two-dimensional spin ice
复制标题
二维自旋冰中交流磁响应的缩放模拟
DOI：
10.1103/physrevb.90.144428
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
H. Kadowaki
中科院分区：
文献类型：
--
作者：
H. Otsuka;H. Takatsu;K. Goto;H. Kadowaki
发展了二维自旋冰中热激活磁单极子的频变磁化率理论。通过将基态流形附近的系统模拟为具有熵相互作用的二维库仑气体，然后用二维Sine-Gordon模型，我们证明了磁化率具有标度形式，其中特征频率与扩散运动的单极子之间的电荷关联长度有关，并与主呼吸激发有关。动力学标度是普遍适用的，不仅适用于Kagome冰，也适用于超流和超导薄膜以及可能包括人造自旋冰的一般2D冰。
A theory for frequency-dependent magnetic susceptibilityis developed for thermally activated magnetic monopoles in a two-dimensional (2D) spin ice. By modeling the system in the vicinity of the ground-state manifold as a 2D Coulomb gas with an entropic interaction, and then as a 2D sine-Gordon model, we have shown that the susceptibility has a scaling form, where the characteristic frequencyis related to a charge correlation length between diffusively moving monopoles, and to the principal-breather excitation. The dynamical scaling is universal and applicable not only for kagome ice, but also for superfluid and superconducting films and generic 2D ices possibly including the artificial spin ice.