Importance of local correlations for the order parameter of high-T_c superconductors

M. Balzer; W. Hanke; M. Potthoff

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Importance of local correlations for the order parameter of high-T_c superconductors

机译：局部相关性对于高T_c超导体的阶跃参数的重要性

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It is shown that local temporal correlations in addition to nonlocal spatial correlations are important to understand the size and the doping dependence of the d-wave superconducting order parameter of high-temperature superconductors. To this end, the hole- and electron-doped two-dimensional Hubbard model at zero temperature is considered and treated by an extension of the variational cluster approximation. Within this approach, the effects of temporal correlations can be studied systematically and in a thermodynamically consistent way by comparing results obtained from different reference clusters. Contact can be made with previous cellular (plaquette) dynamical mean-field calculations. This shows that temporal correlations considerably decrease the order parameter and provide a substantial gain of binding energy. Besides, a few methodical insights regarding real-space quantum-cluster approaches are obtained in addition.

机译：结果表明，除了非局部空间相关性以外，局部时间相关性对于理解高温超导体的d波超导阶数参数的大小和掺杂依赖性也很重要。为此，考虑了零温度下的空穴和电子掺杂的二维Hubbard模型，并通过变分簇近似的扩展对其进行了处理。在这种方法中，可以通过比较从不同参考簇获得的结果，以热力学一致的方式系统地研究时间相关性的影响。可以与以前的蜂窝（网格）动态平均场计算进行联系。这表明时间相关性显着降低了阶数参数，并提供了大量的结合能。此外，还获得了一些有关现实空间量子聚类方法的方法学见解。

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来源
《Physical review》 |2010年第14期|144516.1-144516.7|共7页
作者
M. Balzer; W. Hanke; M. Potthoff;
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作者单位

I. Institut fuer Theoretische Physik, Universitaet Hamburg, Jungiusstrasse 9, D-20355 Hamburg, Germany;

rnInstitut fuer Theoretische Physik und Astrophysik, Universitaet Wuerzburg, Am Hubland, D-97074 Wuerzburg, Germany;

rnI. Institut fuer Theoretische Physik, Universitaet Hamburg, Jungiusstrasse 9, D-20355 Hamburg, Germany;

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theories and models of many-electron systems; theories and models of superconducting state;

机译：多电子系统的理论和模型;超导状态理论与模型;

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Importance of local correlations for the order parameter of high-T_c superconductors

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