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arXiv 0810.3914cond-mat.supr-con
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具有共存电荷序的d波超导体中的低温准粒子输运

Low temperature quasiparticle transport in a d-wave superconductor with coexisting charge order

Adam C. Durst, Subir Sachdev

摘要:

根据在欠掺杂铜氧化物超导体中电荷序与d波超导性共存的证据,我们研究了这种电荷序影响系统的准粒子激发的方式,特别是这些准粒子的低温热输运。本文考虑一种d波超导体,其中超导性与波矢(π/a,0)的电荷密度波级共存。虽然准粒子能谱的节点幸存的电荷秩序的发病,存在一个临界值的电荷密度波序参量超过该准粒子谱成为完全gapped。我们进行了线性响应久保公式计算的热导率在低温(通用)限制。结果表明,热输运的依赖性增加的电荷顺序的准粒子光谱成为完全间隙和热导率消失的临界值。除了数值结果,封闭形式的表达式得到的清洁限制的特殊情况下,各向同性狄拉克节点。电荷顺序对低温热输运的影响的签名被确定。

英文摘要:

In light of the evidence that charge order coexists with d-wave superconductivity in the underdoped cuprate superconductors, we investigate the manner in which such charge order will influence the quasiparticle excitations of the system and, in particular, the low-temperature transport of heat by those quasiparticles. We consider a d-wave superconductor in which the superconductivity coexists with charge density wave order of wave vector (π/a,0). While the nodes of the quasiparticle energy spectrum survive the onset of charge order, there exists a critical value of the charge density wave order parameter beyond which the quasiparticle spectrum becomes fully gapped. We perform a linear response Kubo formula calculation of thermal conductivity in the low temperature (universal) limit. Results reveal the dependence of thermal transport on increasing charge order up to the critical value at which the quasiparticle spectrum becomes fully gapped and thermal conductivity vanishes. In addition to numerical results, closed-form expressions are obtained in the clean limit for the special case of isotropic Dirac nodes. Signatures of the influence of charge order on low-temperature thermal transport are identified.

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