Ba0.6K0.4Fe2As2的精细电子结构和超导能隙(英文)

被引：1
|
作者：
蔡永青 [1 ,2 ]
黄建伟 [1 ]
苗泰民 [1 ,2 ]
吴定松 [1 ,2 ]
高强 [1 ,2 ]
李聪 [1 ,2 ]
徐煜 [1 ,2 ]
贾俊杰 [1 ,2 ]
王庆艳 [1 ,2 ,3 ]
黄元 [1 ,2 ,3 ]
刘国东 [1 ,2 ,3 ]
张丰丰 [4 ]
张申金 [4 ]
杨峰 [4 ]
王志敏 [4 ]
彭钦军 [4 ]
许祖彦 [4 ]
赵林 [1 ,2 ,3 ]
周兴江 [1 ,2 ,3 ,5 ]
机构：
[1] National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
[2] University of Chinese Academy of Sciences
[3] Songshan Lake Materials Laboratory
[4] Technical Institute of Physics and Chemistry, Chinese Academy of Sciences
[5] Beijing Academy of Quantum Information Sciences
来源：
Science Bulletin | 2021年 / 66卷 / 18期
基金：
中国国家自然科学基金;
关键词：
(Ba0.6K0.4)Fe2As2; ARPES; Electronic structure; Superconducting gap; Band folding;
D O I：
暂无
中图分类号：
TM26 [超导体、超导体材料];
学科分类号：
0805 ; 080502 ; 080801 ;
摘要：
精细的电子结构和超导能隙是理解铁基超导体超导机理的前提和基础,然而,即使对于被广泛研究的最佳掺杂的Ba0.6K0.4Fe2As2,其电子结构和超导能隙仍然存在不少争议.为了解决这些争议,本文利用高分辨氦灯和激光角分辨光电子能谱对最佳掺杂的Ba0.6Ka.4Fe2AS2进行了详细的研究,确定了r点和M点的精细电子结构和超导能隙.超导态和正常态下在M点附近作者观测到了一个小的电子型能带。和一个M型的能带δ,直接提取的超导能隙大小是5.5 meV,远远小于之前所有的ARPES测量结果.另外,作者直接观测到了超导态下和正常态下都存在r点和M点能带的复制,确定了超导态下r点附近平带的起源,是由M点e能带复制到r点的能带和p能带的超导回弯2部分组成.这些实验结果解决了关于最佳掺杂(Ba0.6Ka.4)Fe2As2的电子结构和超导能隙的一系列争议,这对于检验并建立理论来理解铁基超导体的超导机理提供了关键的信息.
引用
收藏
页码：1839 / 1848
页数：10
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共 39 条
  • [1] Comparative study of vortex dynamics in CaKFe4As4 and Ba0.6K0.4Fe2As2 single crystals
    Wang Cheng
    Hai Lin
    Bing Shen
    Hai-Hu Wen
    [J]. Science Bulletin, 2019, 64 (02) : 81 - 90
  • [2] Emergence of superconductivity from fully incoherent normal state in an iron-based superconductor (Ba0.6K0.4)Fe2As2
    Jianwei Huang
    Lin Zhao
    Cong Li
    Qiang Gao
    Jing Liu
    Yong Hu
    Yu Xu
    Yongqing Cai
    Dingsong Wu
    Ying Ding
    Cheng Hu
    Huaxue Zhou
    Xiaoli Dong
    Guodong Liu
    Qingyan Wang
    Shenjin Zhang
    Zhimin Wang
    Fengfeng Zhang
    Feng Yang
    Qinjun Peng
    Zuyan Xu
    Chuangtian Chen
    Xingjiang Zhou
    [J]. Science Bulletin, 2019, 64 (01) : 11 - 19
  • [3] Surface terminations and layer-resolved tunneling spectroscopy of the 122 iron pnictide superconductors
    Li, Ang
    Yin, Jia-Xin
    Wang, Jihui
    Wu, Zheng
    Ma, Jihua
    Sefat, Athena S.
    Sales, Brian C.
    Mandrus, David G.
    McGuire, Michael A.
    Jin, Rongying
    Zhang, Chenglin
    Dai, Pengcheng
    Lv, Bing
    Chu, Ching-Wu
    Liang, Xuejin
    Hor, P. -H.
    Ting, C. -S.
    Pan, Shuheng H.
    [J]. PHYSICAL REVIEW B, 2019, 99 (13)
  • [4] New developments in laser-based photoemission spectroscopy and its scientific applications: a key issues review[J] . Xingjiang Zhou,Shaolong He,Guodong Liu,Lin Zhao,Li Yu,Wentao Zhang.Reports on Progress in Physics . 2018 (6)
  • [5] Antiferroic electronic structure in the nonmagnetic superconducting state of the iron-based superconductors
    Shimojima, Takahiro
    Malaeb, Walid
    Nakamura, Asuka
    Kondo, Takeshi
    Kihou, Kunihiro
    Lee, Chul-Ho
    Iyo, Akira
    Eisaki, Hiroshi
    Ishida, Shigeyuki
    Nakajima, Masamichi
    Uchida, Shin-ichi
    Ohgushi, Kenya
    Ishizaka, Kyoko
    Shin, Shik
    [J]. SCIENCE ADVANCES, 2017, 3 (08):
  • [6] Low-energy microscopic models for iron-based superconductors: a review[J] . Rafael M Fernandes,Andrey V Chubukov.Reports on Progress in Physics . 2017 (1)
  • [7] Electronic structure and superconductivity of FeSe-related superconductors
    Liu, Xu
    Zhao, Lin
    He, Shaolong
    He, Junfeng
    Liu, Defa
    Mou, Daixiang
    Shen, Bing
    Hu, Yong
    Huang, Jianwei
    Zhou, X. J.
    [J]. JOURNAL OF PHYSICS-CONDENSED MATTER, 2015, 27 (18)
  • [8] Antiferromagnetic order and spin dynamics in iron-based superconductors
    Dai, Pengcheng
    [J]. REVIEWS OF MODERN PHYSICS, 2015, 87 (03) : 855 - 896
  • [9] Evidence of a universal relation between electron-mode coupling and Tc in Ba1-xKxFe2As2 superconductor from laser angle-resolved photoemission spectroscopy
    Malaeb, W.
    Shimojima, T.
    Ishida, Y.
    Kondo, T.
    Okazaki, K.
    Ota, Y.
    Ohgushi, K.
    Kihou, K.
    Lee, C. H.
    Iyo, A.
    Eisaki, H.
    Ishida, S.
    Nakajima, M.
    Uchida, S.
    Fukazawa, H.
    Saito, T.
    Kohori, Y.
    Shin, S.
    [J]. PHYSICAL REVIEW B, 2014, 90 (19)
  • [10] Observation of Momentum-Confined In-Gap Impurity State in Ba{0.6}K{0.4}Fe{2}As{2}: Evidence for Antiphase s{±} Pairing[J] . P. Zhang,P. Richard,T. Qian,X. Shi,J. Ma,L.-K. Zeng,X.-P. Wang,E. Rienks,C.-L. Zhang,Pengcheng Dai,Y.-Z. You,Z.-Y. Weng,X.-X. Wu,J. P. Hu,H. Ding.Physical Review X . 2014 (3)
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