Self-consistent Vertex Correction Analysis for Iron-based Superconductors: Mechanism of Coulomb Interaction-Driven Orbital Fluctuations

被引：183

作者：

Onari, Seiichiro ^{[1
,2
]}

Kontani, Hiroshi ^{[1
,2
]}

机构：

[1] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648602, Japan

[2] TRIP, JST, Nagoya, Aichi 4648602, Japan

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 13期

关键词：

TRANSITION; SYSTEMS;

D O I：

10.1103/PhysRevLett.109.137001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the mechanism of orbital or spin fluctuations due to multiorbital Coulomb interaction in iron-based superconductors, going beyond the random-phase approximation. For this purpose, we develop a self-consistent vertex correction (VC) method, and find that multiple orbital fluctuations in addition to spin fluctuations are mutually emphasized by the "multimode interference effect'' described by the VC. Then, both antiferro-orbital and ferro-orbital (= nematic) fluctuations simultaneously develop for J/U similar to 0.1, both of which contribute to the s-wave superconductivity. Especially, the ferro-orbital fluctuations give the orthorhombic structure transition as well as the softening of shear modulus C-66.

引用

页数：5

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