Renormalization group analysis of competing orders and the pairing symmetry in Fe-based superconductors

被引:79
|
作者
Chubukov, A. V. [1 ]
机构
[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
来源
基金
美国国家科学基金会;
关键词
Superconductivity; Magnetism; Pairing symmetry; ITINERANT ANTIFERROMAGNETISM; TRANSITION;
D O I
10.1016/j.physc.2009.03.023
中图分类号
O59 [应用物理学];
学科分类号
摘要
We analyze antiferromagnetism and superconductivity in novel Fe-based superconductors within the weak-coupling, itinerant model of electron and hole pockets near (0,0) and (pi, pi) in the folded Brillouin zone. We discuss the interaction Hamiltonian. the nesting, the RG flow of the couplings at energies above and below the Fermi energy, and the interplay between SDW magnetism, superconductivity and charge orbital order. We argue that SDW antiferromagnetism wins at zero doping but looses to superconductivity upon doping. We show that the most likely symmetry of the superconducting gap is A(1g) in the folded zone. This gap has no nodes on the Fermi surface but changes sign between hole and electron pockets. We also argue that at weak coupling, this pairing predominantly comes not from spin fluctuation exchange but from a direct pair hopping between hole and electron pockets. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:640 / 650
页数:11
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