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arXiv 1502.00002cond-mat.dis-nncond-mat.str-el
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自旋和对密度波玻璃

Spin and pair density wave glasses

David F. Mross, T. Senthil

摘要:

平移对称性的自发破缺-被称为“密度波”序-在自然界中是很常见的。然而,这种状态对杂质或其他形式的冻结无序非常敏感,导致迷人的玻璃现象。我们分析了杂质对固体中一种特别普遍的平移对称性破缺形式的影响:具有空间调制磁序的自旋密度波(SDW)。相关的现象发生在对密度波(PDW)超导体中,其中超导序是空间调制的。对于弱无序,我们发现,SDW / PDW秩序可以generally让位给SDW / PDW玻璃-新的相位的物质与一些惊人的性能,我们介绍和特点。特别是,他们表现出一个有趣的组合,传统的(破缺)和自旋玻璃(爱德华-安德森)秩序。这反映在这样一个系统的动态响应中,正如玻璃所预期的那样,它在某些变量中非常慢,但令人惊讶的是,在其他变量中却很快。我们的结果适用于所有单轴金属SDW系统的有序向量是不相称的晶格。此外,PDW玻璃的可能性对最近关于$La_{2-x}Ba_xCu_2O_4$的一些理论和实验工作具有重要的影响。

英文摘要:

Spontaneous breaking of translational symmetry---known as `density wave' order---is common in nature. However such states are strongly sensitive to impurities or other forms of frozen disorder leading to fascinating glassy phenomena. We analyze impurity effects on a particularly ubiquitous form of broken translation symmetry in solids: a Spin Density Wave (SDW) with spatially modulated magnetic order. Related phenomena occur in Pair Density Wave (PDW) superconductors where the superconducting order is spatially modulated. For weak disorder, we find that the SDW / PDW order can generically give way to a SDW / PDW glass---new phases of matter with a number of striking properties, which we introduce and characterize here. In particular, they exhibit an interesting combination of conventional (symmetry-breaking) and spin glass (Edwards-Anderson) order. This is reflected in the dynamic response of such a system, which---as expected for a glass---is extremely slow in certain variables, but---surprisingly---is fast in others. Our results apply to all uniaxial metallic SDW systems where the ordering vector is incommensurate with the crystalline lattice. In addition, the possibility of a PDW glass has important consequences for some recent theoretical and experimental work on $La_{2-x}Ba_xCu_2O_4$.

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