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Competition Between The Pseudogap And Superconductivity In The High-t_c Copper Oxides

机译：高t_c铜氧化物中Pseeudogap与超导之间的竞争

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In a classical Bardeen-Cooper-Schrieffer superconductor, pairing and coherence of electrons are established simultaneously below the critical transition temperature (T_c), giving rise to a gap in the electronic energy spectrum. In the high-T_c copper oxide superconductors, however, a pseudogap extends above T_c. The relationship between the pseudogap and superconductivity is one of the central issues in this field. Spectral gaps arising from pairing precursors are qualitatively similar to those caused by competing electronic states, rendering a standard approach to their analysis inconclusive. The issue can be settled, however, by studying the correlation between the weights associated with the pseudogap and superconductivity spectral features. Here we report a study of two spectral weights using angle-resolved photo-emission spectroscopy. The weight of the superconducting coherent peak increases away from the node following the trend of the superconducting gap, but starts to decrease in the antinodal region. This striking non-monotonicity reveals the presence of a competing state. We demonstrate a direct correlation, for different values of momenta and doping, between the loss in the low-energy spectral weight arising from the opening of the pseudogap and a decrease in the spectral weight associated with superconductivity. We therefore conclude that the pseudogap competes with the superconductivity by depleting the spectral weight available for pairing.
机译：在经典的Bardeen-Cooper-Schrieffer超导体中，在临界转变温度（T_c）以下，电子的配对和相干性同时建立，从而导致电子能谱出现缺口。然而，在高T_c的氧化铜超导体中，伪间隙在T_c之上延伸。伪间隙与超导性之间的关系是该领域的核心问题之一。配对前体产生的光谱缺口在质量上与竞争电子态所造成的光谱缺口相似，因此无法对其进行标准分析。但是，可以通过研究与伪间隙相关的权重与超导光谱特征之间的相关性来解决这个问题。在这里，我们报告使用角度分辨光发射光谱法对两个光谱权重的研究。随着超导间隙的趋势，超导相干峰的权重远离节点增加，但在反节点区域开始减小。这种惊人的非单调性揭示了竞争状态的存在。我们证明了对于不同的矩量和掺杂值，由伪间隙的打开引起的低能谱权重的损失与与超导相关的谱权重的减少之间存在直接的相关性。因此，我们得出结论，伪间隙通过耗尽可用于配对的频谱权重而与超导竞争。

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