Helical glasses near ferromagnetic quantum criticality
Helical glasses near ferromagnetic quantum criticality
复制标题
接近铁磁量子临界点的螺旋玻璃
DOI：
10.1103/physrevb.87.224203
复制
发表时间：
2013
影响因子：
3.7
通讯作者：
Thomson S
中科院分区：
文献类型：
--
作者：
Thomson S
我们研究了淬灭电荷无序对三个空间维度中的巡回铁磁量子临界点附近的相重建的影响。将复制无序平均值与量子无序有序机制的费米子版本相结合，我们发现弱无序会破坏铁磁态的稳定性，并增强对不相称的螺旋磁序的敏感性。螺旋相的戈德斯通模式由 a 模型控制。螺旋螺距中诱发的无序性产生了戈德斯通模式的随机各向异性，在螺旋顺序的相位中诱发涡线并使得磁相关性具有强各向异性相关长度的短程。
We study the effects of quenched charge disorder on the phase reconstruction near itinerant ferromagnetic quantum critical points in three spatial dimensions. Combining a Replica-disorder average with a fermionic version of the quantum order-by-disorder mechanism, we show that weak disorder destabilizes the ferromagnetic state and enhances the susceptibility towards incommensurate, spiral magnetic ordering. The Goldstone modes of the spiral phase are governed by a-model. The induced disorder in the pitch of the spiral generates a random anisotropy for the Goldstone modes, inducing vortex lines in the phase of the helical order and rendering the magnetic correlations short ranged with a strongly anisotropic correlation length.