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arXiv 0705.1731cond-mat.supr-concond-mat.str-el
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高温超导体Pb-Bi2Sr2CuO6 +x的两个能隙的成像

Imaging the Two Gaps of the High-TC Superconductor Pb-Bi2Sr2CuO6+x

M. C. Boyer, W. D. Wise, Kamalesh Chatterjee, Ming Yi, Takeshi Kondo, T. Takeuchi, H. Ikuta, E. W. Hudson

摘要:

在许多高温超导体的超导转变温度TC以上观察到的赝能隙态的性质是许多争论的中心。最近,这种讨论集中在这些材料中的能隙的数量上。一些实验表明,一个单一的能隙,这意味着赝能隙是一个先驱状态。另一些人则认为有两个阶段,这表明这是一个竞争或共存的阶段。本文报道了Pb-Bi_2Sr_2CuO_(6 +x)的变温扫描隧道光谱。我们已经发现了一个新的,狭窄的,均匀的差距,消失在TC附近,叠加在典型的观察到的,不均匀的,宽的差距,这只是弱的温度依赖性。这些结果不仅支持了两个间隙的图片,但也解释了以前令人不安的扫描隧道显微镜和其他实验测量之间的差异。

英文摘要:

The nature of the pseudogap state, observed above the superconducting transition temperature TC in many high temperature superconductors, is the center of much debate. Recently, this discussion has focused on the number of energy gaps in these materials. Some experiments indicate a single energy gap, implying that the pseudogap is a precursor state. Others indicate two, suggesting that it is a competing or coexisting phase. Here we report on temperature dependent scanning tunneling spectroscopy of Pb-Bi2Sr2CuO6+x. We have found a new, narrow, homogeneous gap that vanishes near TC, superimposed on the typically observed, inhomogeneous, broad gap, which is only weakly temperature dependent. These results not only support the two gap picture, but also explain previously troubling differences between scanning tunneling microscopy and other experimental measurements.

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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