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arXiv 1502.07498cond-mat.supr-con
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与超导电性竞争的电荷密度波的长程序和钉扎

Long-range order and pinning of charge-density waves in competition with superconductivity

Yosef Caplan, Gideon Wachtel, Dror Orgad

摘要:

最近的实验表明,电荷密度波关联是普遍存在于欠掺杂铜氧化物超导体。这种关联在弱磁场下是短程的,但在低温下超过交叉场后,其强度和空间范围迅速增加。在这里,我们考虑的可能性,长程电荷密度波秩序的层状系统中,这种秩序与超导性的竞争。我们表明,在干净的限制,低温长程序是稳定的任意弱磁场。这种与实验的明显差异可以通过无序的存在来解决。像场一样,无序使电荷密度波的晕成核,但与前者不同的是,它也破坏了晕间的相干性,导致相关长度总是有限的。我们的研究结果是兼容的各种实验趋势,包括发病的较长范围的相关性引起的层间耦合以上的特征场尺度。

英文摘要:

Recent experiments show that charge-density-wave correlations are prevalent in underdoped cuprate superconductors. The correlations are short ranged at weak magnetic fields but their intensity and spatial extent increase rapidly at low temperatures beyond a crossover field. Here we consider the possibility of long-range charge-density-wave order in a model of a layered system where such order competes with superconductivity.We show that in the clean limit, low-temperature long-range order is stabilized by arbitrarily weak magnetic fields. This apparent discrepancy with the experiments is resolved by the presence of disorder. Like the field, disorder nucleates halos of charge-density wave, but unlike the former it also disrupts interhalo coherence, leading to a correlation length that is always finite. Our results are compatible with various experimental trends, including the onset of longer range correlations induced by interlayer coupling above a characteristic field scale.

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