S-4 Symmetric Microscopic Model for Iron-Based Superconductors

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	S-4 Symmetric Microscopic Model for Iron-Based Superconductors
	Hu, JP ; Hao, NN
刊名	PHYSICAL REVIEW X
	2012
卷号	2 期号:2
关键词	RESOLVED PHOTOEMISSION-SPECTROSCOPY HIGH-TEMPERATURE SUPERCONDUCTIVITY MAGNETIC EXCHANGE INTERACTIONS FERMI-SURFACE PAIRING STATE SPIN-WAVES PHYSICS BA0.6K0.4FE2AS2 CHALCOGENIDES MECHANISM
ISSN号	2160-3308
通讯作者	Hu, JP (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, POB 603, Beijing 100080, Peoples R China.
中文摘要	Although iron-based superconductors are multiorbital systems with complicated band structures, we demonstrate that the low-energy physics which is responsible for their high-T-c superconductivity is essentially governed by an effective two-orbital Hamiltonian near half filling. This underlying electronic structure is protected by the S-4 symmetry. With repulsive or strong next-nearest-neighbor antiferromagnetic exchange interactions, the model results in a robust A(1g) s-wave pairing which can be mapped exactly to the d-wave pairing observed in cuprates. The classification of the superconducting (SC) states according to the S4 symmetry leads to a natural prediction of the existence of two different phases, named the A and B phases. In the B phase, the superconducting order has an overall sign change along the c axis between the top and bottom As (or Se) planes in a single Fe-As (or Fe-Se) trilayer structure, the common building block of iron-based superconductors. The sign change is analogous to the sign change in the d-wave superconducting state of cuprates upon 90 degrees rotation. Our derivation provides a unified understanding of iron pnictides and iron chalcogenides, and suggests that cuprates and iron-based superconductors share an identical high-T-c superconducting mechanism.
收录类别	SCI
资助信息	Ministry of Science and Technology of China 973 program [2012CB821400]; National Science Foundation of China Grant [NSFC-1190024]
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/52284]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Hu, JP,Hao, NN. S-4 Symmetric Microscopic Model for Iron-Based Superconductors[J]. PHYSICAL REVIEW X,2012,2(2).
APA	Hu, JP,&Hao, NN.(2012).S-4 Symmetric Microscopic Model for Iron-Based Superconductors.PHYSICAL REVIEW X,2(2).
MLA	Hu, JP,et al."S-4 Symmetric Microscopic Model for Iron-Based Superconductors".PHYSICAL REVIEW X 2.2(2012).