arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0902.1362cond-mat.supr-con
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简单立方晶格上三维$t$ - $J$模型的超导对称性

Superconducting symmetry of three-dimensional $t$-$J$ model on simple cubic lattice

Huai-Xiang Huang, YouQuan Li

摘要:

由于在$\mathrm{(Ba,K)Fe_2As_2}$中发现了近各向同性的超导电性,我们利用重整化平均场论研究了三维简单立方晶格上的$t$ - $J$模型.引入一个可调的各向异性参数来控制$z$方向上的耦合。详细研究了超导序的对称性。计算表明,在各向同性情况下,三个垂直方向上的配对参数之间存在${2/3}π$相移。而当$z$方向的相互作用被抑制时,对应的配对参数幅值迅速减小,当各向异性率小于0.75时,有利于二维d波态配对.

英文摘要:

Motivated by the finding of nearly isotropic superconductivity in $\mathrm{(Ba,K)Fe_2As_2}$, we use renormalized mean field theory to investigated the $t$-$J$ model on three-dimensional simple cubic lattice. A tunable anisotropic parameter is introduced to dictate the coupling on $z$ direction. The symmetry of the superconducting order is studied in detail. Calculation shows that for the isotropic case, pairing parameters on the three perpendicular directions have ${2/3}π$ phase shift to each other. However, when the interaction on $z$ direction is suppressed, the corresponding amplitude of the pairing parameter decreases rapidly, furthermore, two-dimensional d-wave state pairing is favored when the anisotropic rate less than 0.75.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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