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arXiv 0905.2608cond-mat.str-elcond-mat.supr-con
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欠掺杂铜氧化物中自旋密度波序与超导电性的竞争

Competition between spin density wave order and superconductivity in the underdoped cuprates

Eun Gook Moon, Subir Sachdev

摘要:

我们描述了d波超导性和自旋密度波(SDW)之间的相互作用的理论中的空穴掺杂的铜氧化物在空穴密度低于最佳掺杂。该理论假设局域SDW有序,以及正常状态下载流子的相关电子和空穴袋费米表面。我们描述量子和热波动的本地SDW秩序,这导致d波超导的方向:我们计算超导临界温度和磁场在一个“最小”的通用理论。我们还描述了超导电性对SDW序的反作用,表明SDW序在金属中更稳定。我们的研究结果捕获Demler等人(cond-mat/0103192)的相图的关键方面,在竞争订单的现象学量子理论中获得。最后,我们提出了一个有限温度交叉相图的铜酸盐。在金属状态下,这些是由一个“隐藏”的量子临界点附近的最佳掺杂涉及SDW秩序在金属中的发病控制。然而,超导电性的发生导致SDW顺序的稳定性降低,因此实际的SDW量子临界点出现在明显较低的掺杂。我们所有的分析都是在最近的实验结果的背景下进行的。

英文摘要:

We describe the interplay between d-wave superconductivity and spin density wave (SDW) order in a theory of the hole-doped cuprates at hole densities below optimal doping. The theory assumes local SDW order, and associated electron and hole pocket Fermi surfaces of charge carriers in the normal state. We describe quantum and thermal fluctuations in the orientation of the local SDW order, which lead to d-wave superconductivity: we compute the superconducting critical temperature and magnetic field in a `minimal' universal theory. We also describe the back-action of the superconductivity on the SDW order, showing that SDW order is more stable in the metal. Our results capture key aspects of the phase diagram of Demler et al. (cond-mat/0103192) obtained in a phenomenological quantum theory of competing orders. Finally, we propose a finite temperature crossover phase diagram for the cuprates. In the metallic state, these are controlled by a `hidden' quantum critical point near optimal doping involving the onset of SDW order in a metal. However, the onset of superconductivity results in a decrease in stability of the SDW order, and consequently the actual SDW quantum critical point appears at a significantly lower doping. All our analysis is placed in the context of recent experimental results.

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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