Theory of pseudogap phenomena in High-Tc cuprates based on the strong coupling superconductivity
Theory of pseudogap phenomena in High-Tc cuprates based on the strong coupling superconductivity
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基于强耦合超导的高温铜酸盐赝能隙现象理论
DOI：
10.1143/jpsj.68.2999
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发表时间：
1999
影响因子：
1.7
通讯作者：
K. Yamada
中科院分区：
文献类型：
--
作者：
Y. Yanase;K. Yamada
本文研究了强耦合超导电性对正常态电子结构的影响。指出高温超导铜酸盐中的赝能隙现象是强耦合超导的前兆。我们对T矩阵的倒数关于动量和频率进行了展开，并讨论了展开参数的性质。我们估计这些参数，并进行计算的单粒子自能使用的T-矩阵和自洽的T-矩阵近似，分别。我们表明，超导涨落，这是强扩散在传统的弱耦合理论，成为传播，并在强耦合的情况下，具有预先形成的对的字符。由于与热激发弱阻尼预成对共振的影响，谱权和态密度呈现出类似于能隙的特征。费米能的光谱权重很强...
In this paper we study the effects of the strong coupling superconductivity on the normal state electronic structure. We point out that the pseudogap phenomena in High- T c cuprates are naturally explained as a precursor of the strong coupling superconductivity. We expand the reciprocal of the T-matrix with respect to the momentum and the frequency, and we discuss the properties of the expansion parameters. We estimate these parameters and carry out the calculations for the single particle self-energy using the T-matrix and the self-consistent T-matrix approximations, respectively. We show that the superconducting fluctuations, which are strongly diffusive within the conventional weak coupling theory, become propagative and have the character of the pre-formed pairs in the strong coupling case. The spectral weight and the density of states show the gap-like features by the effects of the resonances with the thermally excited weakly-damped pre-formed pairs. The spectral weight at the Fermi energy is strong...
DOI：
10.1007/bf01303701
发表时间：
1986-01-01
期刊：
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER
影响因子：
--
作者：
BEDNORZ, JG;MULLER, KA
通讯作者：
MULLER, KA