Superconducting pairing symmetry and energy gaps of the two-orbital t-t′-J-J′ model: comparisons with the ARPES experiments in iron pnictides

被引：9

作者：

Lu, Feng ^{[1
,2
]}

Zou, Liang-Jian ^{[1
]}

机构：

[1] Chinese Acad Sci, Key Lab Mat Phys, Inst Solid State Phys, Hefei 230031, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2009年 / 21卷 / 25期

关键词：

UNCONVENTIONAL SUPERCONDUCTIVITY; LAYERED SUPERCONDUCTOR; ORDER;

D O I：

10.1088/0953-8984/21/25/255701

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Motivated by the discovery of the iron-based superconductors, we present the theoretical results on the superconducting phase diagram, the temperature-dependent Fermi surface structures in normal state and the angle-resolved photoemission spectroscopy (ARPES) character of quasiparticles of the two-orbital t-t'-J-J' model. In the reasonable physical parameter region of LaFeAsO1-xFx, we find the superconducting phase is stable, and the pairing symmetry is weakly anisotropic and nodeless d(x2-eta y2) + S-x2y2-wave, qualitatively in agreement with the ARPES experiments in iron pnictide superconductors. Nevertheless, the two ratios of the energy gaps to T-c deviate from the ARPES data, suggesting that a more elaborate theoretical model is needed.

引用

页数：7