Unconventional Anisotropic s-Wave Superconducting Gaps of the LiFeAs Iron-Pnictide Superconductor

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	Unconventional Anisotropic s-Wave Superconducting Gaps of the LiFeAs Iron-Pnictide Superconductor
	Umezawa, K ; Li, Y ; Miao, H ; Nakayama, K ; Liu, ZH ; Richard, P ; Sato, T ; He, JB ; Wang, DM ; Chen, GF ; Ding, H ; Takahashi, T ; Wang, SC
刊名	PHYSICAL REVIEW LETTERS
	2012
卷号	108 期号:3
关键词	RESOLVED PHOTOEMISSION-SPECTROSCOPY BA0.6K0.4FE2AS2
ISSN号	0031-9007
通讯作者	Umezawa, K (reprint author), Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan.
中文摘要	We have performed high-resolution angle-resolved photoemission spectroscopy on Fe-based superconductor LiFeAs (T-c = 18 K). We reveal multiple nodeless superconducting (SC) gaps with 2 Delta/k(B)T(c) ratios varying from 2.8 to 6.4, depending on the Fermi surface (FS). We also succeeded in directly observing a gap anisotropy along the FS with magnitude up to similar to 30%. The anisotropy is fourfold symmetric with an antiphase between the hole and electron FSs, suggesting complex anisotropic interactions for the SC pairing. The observed momentum dependence of the SC gap offers an excellent opportunity to investigate the underlying pairing mechanism.
收录类别	SCI
资助信息	JSPS; TRiP-JST; CREST-JST; MEXT of Japan; NSFC; Chinese Academy of Sciences; NSF; Ministry of Science and Technology of China
语种	英语
公开日期	2013-09-23
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/46381]
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	Umezawa, K,Li, Y,Miao, H,et al. Unconventional Anisotropic s-Wave Superconducting Gaps of the LiFeAs Iron-Pnictide Superconductor[J]. PHYSICAL REVIEW LETTERS,2012,108(3).
APA	Umezawa, K.,Li, Y.,Miao, H.,Nakayama, K.,Liu, ZH.,...&Wang, SC.(2012).Unconventional Anisotropic s-Wave Superconducting Gaps of the LiFeAs Iron-Pnictide Superconductor.PHYSICAL REVIEW LETTERS,108(3).
MLA	Umezawa, K,et al."Unconventional Anisotropic s-Wave Superconducting Gaps of the LiFeAs Iron-Pnictide Superconductor".PHYSICAL REVIEW LETTERS 108.3(2012).