Evidence for bosonic mode coupling in electron dynamics of LiFeAs superconductor

doi:10.1088/1674-1056/abb21f

中国物理B ›› 2020, Vol. 29 ›› Issue (10): 107402-.doi: 10.1088/1674-1056/abb21f

Cong Li(李聪)¹^,², Guangyang Dai(代光阳)¹^,², Yongqing Cai(蔡永青)¹^,², Yang Wang(王阳)¹^,², Xiancheng Wang(望贤成)¹^,², Qiang Gao(高强)¹^,², Guodong Liu(刘国东)¹, Yuan Huang(黄元)¹, Qingyan Wang(王庆艳)¹, Fengfeng Zhang(张丰丰)³, Shenjin Zhang(张申金)³, Feng Yang(杨峰)³, Zhimin Wang(王志敏)³, Qinjun Peng(彭钦军)³, Zuyan Xu(许祖彦)³, Changqing Jin(靳常青)¹^,²^,⁴, Lin Zhao(赵林)¹^,†(), X J Zhou(周兴江)¹^,²^,⁴^,⁵^,‡()

收稿日期:2020-08-14 修回日期:2020-08-14 接受日期:2020-08-25 出版日期:2020-10-05 发布日期:2020-10-05
通讯作者: Lin Zhao(赵林), X J Zhou(周兴江)

Evidence for bosonic mode coupling in electron dynamics of LiFeAs superconductor

Cong Li(李聪)^1,2, Guangyang Dai(代光阳)^1,2, Yongqing Cai(蔡永青)^1,2, Yang Wang(王阳)^1,2, Xiancheng Wang(望贤成)^1,2, Qiang Gao(高强)^1,2, Guodong Liu(刘国东)¹, Yuan Huang(黄元)¹, Qingyan Wang(王庆艳)¹, Fengfeng Zhang(张丰丰)³, Shenjin Zhang(张申金)³, Feng Yang(杨峰)³, Zhimin Wang(王志敏)³, Qinjun Peng(彭钦军)³, Zuyan Xu(许祖彦)³, Changqing Jin(靳常青)^1,2,4, Lin Zhao(赵林)^1,†, and X J Zhou(周兴江)^1,2,4,5,‡

¹ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
² University of Chinese Academy of Sciences, Beijing 100049, China
³ Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
⁴ Songshan Lake Materials Laboratory, Dongguan 523808, China
⁵ Beijing Academy of Quantum Information Sciences, Beijing 100193, China

Received:2020-08-14 Revised:2020-08-14 Accepted:2020-08-25 Online:2020-10-05 Published:2020-10-05
Contact: ^†Corresponding author. E-mail: lzhao@iphy.ac.cn ^‡Corresponding author. E-mail: XJZhou@iphy.ac.cn
About author:
†Corresponding author. E-mail: lzhao@iphy.ac.cn
‡Corresponding author. E-mail: XJZhou@iphy.ac.cn
* Project supported by the National Key Research and Development Program of China (Grant Nos. 2016YFA0300300, 2016YFA0300600, 2017YFA0302900,2018YFA0704200, 2018YFA0305600, and 2019YFA0308000), the National Natural Science Foundation of China (Grant Nos. 11888101, 11922414, and 11874405), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant Nos. XDB25000000 and XDB33010300), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2017013), and the Research Program of Beijing Academy of Quantum Information Sciences (Grant No. Y18G06).

摘要/Abstract

Abstract:

Super-high resolution laser-based angle-resolved photoemission measurements are carried out on LiFeAs superconductor to investigate its electron dynamics. Three energy scales at ∼ 20 meV, ∼ 34 meV, and ∼ 55 meV are revealed for the first time in the electron self-energy both in the superconducting state and normal state. The ∼ 20 meV and ∼ 34 meV scales can be attributed to the coupling of electrons with sharp bosonic modes which are most likely phonons. These observations provide definitive evidence on the existence of mode coupling in iron-based superconductors.

Key words: angle-resolved photoemission spectroscopy (ARPES), iron-based superconductor, electron boson coupling

中图分类号: (Electronic structure (photoemission, etc.))

74.25.Jb

63.20.kd (Phonon-electron interactions) 74.25.Kc (Phonons)

Cong Li(李聪), Guangyang Dai(代光阳), Yongqing Cai(蔡永青), Yang Wang(王阳), Xiancheng Wang(望贤成), Qiang Gao(高强), Guodong Liu(刘国东), Yuan Huang(黄元), Qingyan Wang(王庆艳), Fengfeng Zhang(张丰丰), Shenjin Zhang(张申金), Feng Yang(杨峰), Zhimin Wang(王志敏), Qinjun Peng(彭钦军), Zuyan Xu(许祖彦), Changqing Jin(靳常青), Lin Zhao(赵林), X J Zhou(周兴江). [J]. 中国物理B, 2020, 29(10): 107402-.

Cong Li(李聪), Guangyang Dai(代光阳), Yongqing Cai(蔡永青), Yang Wang(王阳), Xiancheng Wang(望贤成), Qiang Gao(高强), Guodong Liu(刘国东), Yuan Huang(黄元), Qingyan Wang(王庆艳), Fengfeng Zhang(张丰丰), Shenjin Zhang(张申金), Feng Yang(杨峰), Zhimin Wang(王志敏), Qinjun Peng(彭钦军), Zuyan Xu(许祖彦), Changqing Jin(靳常青), Lin Zhao(赵林)†, and X J Zhou(周兴江)‡. Evidence for bosonic mode coupling in electron dynamics of LiFeAs superconductor[J]. Chin. Phys. B, 2020, 29(10): 107402-.

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Evidence for bosonic mode coupling in electron dynamics of LiFeAs superconductor

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