arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0903.0925cond-mat.supr-concond-mat.str-el
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高温超导体的微观研究:超导相

Microscopic approach to high-temperature superconductors: Superconducting phase

S. Sykora, K. W. Becker

摘要:

尽管在理论和实验上做了大量的努力,但对于导致前所未有的高转变温度$T_c$的高温超导体的超导配对机制的理解仍然缺乏。从$t$ - $J$模型出发,在一种新的重整化方案(PRM)的框架下,对中等空穴掺杂下超导相的物理性质进行了微观研究.我们的微观方法使我们能够解释在欠掺杂以及在最佳的空穴掺杂制度的实验结果。在很好的协议与实验,我们发现没有超导解决方案非常小的空穴掺杂。在超导相,序参量原来具有d波对称性与几个晶格常数的相干长度。从角分辨光电子能谱(ARPES)沿费米面得到的光谱函数也与实验符合得很好:光谱显示出在费米能附近的小范围内由相干激发单独引起的峰状结构。

英文摘要:

Despite the intense theoretical and experimental effort, an understanding of the superconducting pairing mechanism of the high-temperature superconductors, leading to an unprecedented high transition temperature $T_c$, is still lacking. Starting from the $t$-$J$ model, we present a microscopic approach to the physical properties of the superconducting phase at moderate hole-doping in the framework of a novel renormalization scheme, called PRM. Our microscopic approach allows us to explain the experimental findings in the underdoped as well as in the optimal hole doping regime. In good agreement with experiments, we find no superconducting solutions for very small hole doping. In the superconducting phase, the order parameter turns out to have d-wave symmetry with a coherence length of a few lattice constants. The spectral function, obtained from angle-resolved photoemission spectroscopy (ARPES) along the Fermi surface, is also in good agreement with experiment: The spectra display peak-like structures which are caused alone by coherent excitations in a small range around the Fermi energy.

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