层状有机导体中的反铁磁性和超导性：变分团簇方法
Antiferromagnetism and superconductivity in layered organic conductors: Variational cluster approach.
作者信息
Sahebsara P, Sénéchal D
机构信息
Département de physique and Regroupement québécois sur les matériaux de pointe, Université de Sherbrooke, Sherbrooke, Québec, Canada, J1K 2R1.
出版信息
Phys Rev Lett. 2006 Dec 22;97(25):257004. doi: 10.1103/PhysRevLett.97.257004. Epub 2006 Dec 20.
The kappa-(ET)2X layered conductors (where ET stands for BEDT-TTF) are studied within the dimer model as a function of the diagonal hopping t' and Hubbard repulsion U. Antiferromagnetism and d-wave superconductivity are investigated at zero temperature using variational cluster perturbation theory (VCPT). For large U, Néel antiferromagnetism exists for t' < t(c2)', with t(c2)' approximately 0.9. For fixed t', as U is decreased (or pressure increased), a d(x2-y2) superconducting phase appears. When U is decreased further, then a d(xy) order takes over. There is a critical value of t(c1)' approximately 0.8 of t' beyond which the AF and dSC phases are separated by the Mott disordered phase.
在二聚体模型中研究了κ-(ET)₂X层状导体（其中ET代表BEDT-TTF），作为对角跳跃t'和哈伯德排斥力U的函数。使用变分团簇微扰理论（VCPT）在零温度下研究反铁磁性和d波超导性。对于大的U，当t' < t(c2)'（t(c2)'约为0.9）时存在奈尔反铁磁性。对于固定的t'，随着U减小（或压力增加），出现d(x²-y²)超导相。当U进一步减小时，d(xy)序取而代之。t'存在一个约为0.8的临界值t(c1)'，超过该值，反铁磁相和d波超导相被莫特无序相分隔。
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