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arXiv 1208.3448cond-mat.supr-concond-mat.str-el
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铜氧化物超导体赝能隙态费米面的坍缩和有序指纹

Collapse of the Fermi surface and fingerprints of order in the pseudogap state of cuprate superconductors

Takeshi Kondo, Ari Palczewski, Yoichiro Hamaya, K. Ogawa, Tsunehiro Takeuchi, J. S. Wen, G. Z. J. Xu, Genda Gu, Adam Kaminski

摘要:

在铜氧化物状态下的费米面是非常不寻常的,因为它似乎是由称为弧的不连续部分组成的。它们的存在挑战了传统的费米面概念,即动量空间中无隙激发的闭合轮廓。在赝能隙状态下的弧长被认为随温度线性增加,这表明在T* 以下存在节点液态。这些结果被解释为d波配对间隙和强散射的相互作用。了解弧的性质是理解赝能隙的起源和铜氧化物物理的先决条件。在这里,我们使用一种新的方法来检测的基础上的态密度的温度依赖性的能隙。随着显着提高的灵敏度,我们证明,弧迅速形成在T* 和它们的长度保持惊人的恒定在T* 和Tarc之间的扩展的温度范围内,与低于T* 的有序状态的存在一致。这些弧跨越动量空间中的固定点,定义了一组波矢量,这些波矢量是导致赝能隙的有序态的指纹。

英文摘要:

The Fermi surface in the state of cuprates is highly unusual because it appears to consist of disconnected segments called arcs. Their very existence challenges the traditional concept of a Fermi surface as closed contours of gapless excitations in momentum space. The length of the arcs in the pseudogap state was thought to linearly increase with temperature, pointing to the existence of a nodal liquid state below T*. These results were interpreted as an interplay of a d-wave pairing gap and strong scattering. Understanding the properties of the arcs is a pre-requisite to understanding the origin of the pseudogap and the physics of the cuprates. Here we use a novel approach to detect the energy gaps based on the temperature dependence of the density of states. With a significantly improved sensitivity, we demonstrate that the arcs form rapidly at T* and their length remains surprisingly constant over an extended temperature range between T* and Tarc, consistent with the presence of an ordered state below T*. These arcs span fixed points in the momentum space defining a set of wave vectors, which are the fingerprints of the ordered state that causes the pseudogap.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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