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arXiv 0705.0111cond-mat.supr-concond-mat.str-el
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铜氧化物高T_{c}超导体正常态赝能隙与超导能隙的光谱区别

Spectroscopic distinction between the normal state pseudogap and the superconducting gap of cuprate high T_{c} superconductors

Li Yu, D. Munzar, A. V. Boris, P. Yordanov, J. Chaloupka, Th. Wolf, C. T. Lin, B. Keimer, C. Bernhard

摘要:

我们报告了宽带红外椭偏测量欠掺杂RBa_{2} Cu_{3} O_{7-d}(R=Y,Nd和La)单晶的c轴电导率。我们的数据提供了一个详细的帐户,由于正常态赝能隙(PG)和超导(SC)间隙的光谱重量(SW)的再分布。他们表明,这些现象涉及不同的能量尺度,表现出不同的掺杂依赖性,因此可能是不同的起源。特别是,在PG状态下的SW再分布非常类似于一个传统的电荷或自旋密度波(CDW或SDW)系统。

英文摘要:

We report on broad-band infrared ellipsometry measurements of the c-axis conductivity of underdoped RBa_{2}Cu_{3}O_{7-d} (R=Y, Nd, and La) single crystals. Our data provide a detailed account of the spectral weight (SW) redistributions due to the normal state pseudogap (PG) and the superconducting (SC) gap. They show that these phenomena involve different energy scales, exhibit distinct doping dependencies and thus are likely of different origin. In particular, the SW redistribution in the PG state closely resembles the one of a conventional charge- or spin density wave (CDW or SDW) system.

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