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arXiv 1302.3252cond-mat.supr-con
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高温铜氧化物超导体的电子phase diagram

Electronic phase diagram of high temperature copper oxide superconductors

U. Chatterjee, J. Zhao, D. Ai, S. Rosenkranz, A. Kaminski, H. Raffy, Z. Z. Li, K. Kadowaki, M. Randeria, M. R. Norman, J. C. Campuzano

摘要:

为了理解铜氧化物高温超导性的起源,我们必须理解它出现的正常状态。在这里,我们研究的正常状态下的电子激发与温度和载流子浓度的Bi2Sr2CaCu2O8使用角分辨光电发射的演变。与常规超导体(其中存在将正常状态与超导状态分开的单个温度标度Tc)相反,高温超导体表现出两个附加的温度标度。一个是赝能隙尺度T*,低于该尺度,电子激发表现出能隙。第二个是相干尺度Tcoh,低于该尺度,由于激发的寿命增加而出现尖锐的光谱特征。我们发现,T* 和Tcoh是强烈的掺杂依赖性和交叉彼此附近的最佳掺杂。因此,最高的超导Tc出现从一个不寻常的正常状态,其特征是相干激发与能隙。

英文摘要:

In order to understand the origin of high-temperature superconductivity in copper oxides, we must understand the normal state from which it emerges. Here, we examine the evolution of the normal state electronic excitations with temperature and carrier concentration in Bi2Sr2CaCu2O8 using angle-resolved photoemission. In contrast to conventional superconductors, where there is a single temperature scale Tc separating the normal from the superconducting state, the high- temperature superconductors exhibit two additional temperature scales. One is the pseudogap scale T*, below which electronic excitations exhibit an energy gap. The second is the coherence scale Tcoh, below which sharp spectral features appear due to increased lifetime of the excitations. We find that T* and Tcoh are strongly doping dependent and cross each other near optimal doping. Thus the highest superconducting Tc emerges from an unusual normal state that is characterized by coherent excitations with an energy gap.

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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