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arXiv 1101.3402cond-mat.supr-con
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条带超导的配对理论

Pairing Theory of Striped Superconductivity

Florian Loder, Siegfried Graser, Arno P. Kampf, Thilo Kopp

摘要:

条状高$T_{\rm c}$超导体,如La $_{2-y-x}$ Nd $_{y}$ Sr $_x$ CuO $_4$和La $_{2-x}$ Ba $_{x}$ CuO $_4$靠近$x=1/8$,显示了自旋和电荷有序与超导电性之间的迷人竞争。因此,这些系统的理论必须同时捕捉反铁磁体的自旋关联和超导体的电子对关联。为此,我们在这里提出了一个有效的哈特里-福克理论,该理论结合了具有有限质量中心动量的电子配对和反铁磁性。我们表明,这个理论再现的关键实验功能,如形成的反铁磁条图案在7/8带填充或准一维电子结构观察到的光电子能谱。

英文摘要:

Striped high-$T_{\rm c}$ superconductors such as La$_{2-y-x}$Nd$_{y}$Sr$_x$CuO$_4$ and La$_{2-x}$Ba$_{x}$CuO$_4$ near $x=1/8$ show a fascinating competition between spin and charge order and superconductivity. A theory for these systems therefore has to capture both the spin correlations of an antiferromagnet and the pair correlations of a superconductor. For this purpose we present here an effective Hartree-Fock theory incorporating both electron pairing with finite center-of-mass momentum and antiferromagnetism. We show that this theory reproduces the key experimental features such as the formation of the antiferromagnetic stripe patterns at 7/8 band filling or the quasi one-dimensional electronic structure observed by photoemission spectroscopy.

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