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arXiv 0908.3168cond-mat.supr-con
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d波超导体中不同形式的共存序与波矢对低温热导率的影响

Effect of coexisting order of various form and wave vector on low-temperature thermal conductivity in d-wave superconductors

Philip R. Schiff, Adam C. Durst

摘要:

根据最近铜氧化物中密度波序的实验证据,我们考虑了一个d波超导体的唯象模型,该超导体具有多种形式和波矢的共存电荷、自旋或对密度波序。我们研究了准粒子能谱的节点结构的演化作为共存顺序的振幅的函数,并进行了低温(普适极限)热导率的图解线性响应计算。本文所述的工作扩展了我们过去的研究,集中在一个特定的单位细胞加倍电荷密度波,推广我们的技术,以更广泛的类共存秩序。我们发现,d波超导体的节点是否存在于一个合理水平的共存秩序中的问题对秩序的形式和波矢是敏感的。然而,在节点确实变得有间隙的情况下,我们确定了这种节点过渡的方法的签名,在低温热导率中,这似乎是相当普遍的。这个签名的幅度被发现是无序依赖的,这表明在欠掺杂的铜氧化物和最近的观察普遍(无序独立)的热导率在欠掺杂制度的偏差共存秩序的存在之间的连接。

英文摘要:

In light of recent experimental evidence of density wave order in the cuprates, we consider a phenomenological model of a d-wave superconductor with coexisting charge, spin or pair density wave order of various form and wave vector. We study the evolution of the nodal structure of the quasiparticle energy spectrum as a function of the amplitude of the coexisting order and perform diagrammatic linear response calculations of the low-temperature (universal-limit) thermal conductivity. The work described herein expands upon our past studies, which focused on a particular unit-cell-doubling charge density wave, generalizing our techniques to a wider class of coexisting order. We find that the question of whether the nodes of the d-wave superconductor survive amidst a reasonable level of coexisting order is sensitive to the form and wave vector of the order. However, in cases where the nodes do become gapped, we identify a signature of the approach to this nodal transition, in the low-temperature thermal conductivity, that appears to be quite general. The amplitude of this signature is found to be disorder-dependent, which suggests a connection between the presence of coexisting order in the underdoped cuprates and recent observations of deviations from universal (disorder-independent) thermal conductivity in the underdoped regime.

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