中国物理B ›› 2024, Vol. 33 ›› Issue (7): 77405-077405.doi: 10.1088/1674-1056/ad51f8

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Negligible normal fluid in superconducting state of heavily overdoped Bi2Sr2CaCu2O8+δ detected by ultra-low temperature angle-resolved photoemission spectroscopy

Chaohui Yin(殷超辉)1,2,†, Qinghong Wang(汪清泓)1,2,†, Yuyang Xie(解于洋)1,2, Yiwen Chen(陈逸雯)1,2, Junhao Liu(刘俊豪)1,2, Jiangang Yang(杨鉴刚)1,2, Junjie Jia(贾俊杰)1,2, Xing Zhang(张杏)1,2, Wenkai Lv(吕文凯)1,2, Hongtao Yan(闫宏涛)1,2, Hongtao Rong(戎洪涛)1,2, Shenjin Zhang(张申金)3, Zhimin Wang(王志敏)3, Nan Zong(宗楠)3, Lijuan Liu(刘丽娟)3, Rukang Li(李如康)3, Xiaoyang Wang(王晓洋)3, Fengfeng Zhang(张丰丰)3, Feng Yang(杨峰)3, Qinjun Peng(彭钦军)3, Zuyan Xu(许祖彦)3, Guodong Liu(刘国东)1,2,4, Hanqing Mao(毛寒青)1,2,4, Lin Zhao(赵林)1,2,4,‡, Xintong Li(李昕彤)1,2,4,§, and Xingjiang Zhou(周兴江)1,2,4,¶   

  1. 1 National Laboratory for Superconductivity, 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
  • 收稿日期:2024-05-24 修回日期:2024-05-30 接受日期:2024-05-30 出版日期:2024-06-18 发布日期:2024-07-05
  • 通讯作者: Lin Zhao, Xintong Li, Xingjiang Zhou E-mail:lzhao@iphy.ac.cn;xintongli@iphy.ac.cn;XJZhou@iphy.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12488201, 12374066, 12074411, and 12374154), the National Key Research and Development Program of China (Grant Nos. 2021YFA1401800, 2022YFA1604200, 2022YFA1403900, and 2023YFA1406000), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant Nos. XDB25000000 and XDB33000000), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0301800), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. Y2021006), and the Synergetic Extreme Condition User Facility (SECUF).

Negligible normal fluid in superconducting state of heavily overdoped Bi2Sr2CaCu2O8+δ detected by ultra-low temperature angle-resolved photoemission spectroscopy

Chaohui Yin(殷超辉)1,2,†, Qinghong Wang(汪清泓)1,2,†, Yuyang Xie(解于洋)1,2, Yiwen Chen(陈逸雯)1,2, Junhao Liu(刘俊豪)1,2, Jiangang Yang(杨鉴刚)1,2, Junjie Jia(贾俊杰)1,2, Xing Zhang(张杏)1,2, Wenkai Lv(吕文凯)1,2, Hongtao Yan(闫宏涛)1,2, Hongtao Rong(戎洪涛)1,2, Shenjin Zhang(张申金)3, Zhimin Wang(王志敏)3, Nan Zong(宗楠)3, Lijuan Liu(刘丽娟)3, Rukang Li(李如康)3, Xiaoyang Wang(王晓洋)3, Fengfeng Zhang(张丰丰)3, Feng Yang(杨峰)3, Qinjun Peng(彭钦军)3, Zuyan Xu(许祖彦)3, Guodong Liu(刘国东)1,2,4, Hanqing Mao(毛寒青)1,2,4, Lin Zhao(赵林)1,2,4,‡, Xintong Li(李昕彤)1,2,4,§, and Xingjiang Zhou(周兴江)1,2,4,¶   

  1. 1 National Laboratory for Superconductivity, 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
  • Received:2024-05-24 Revised:2024-05-30 Accepted:2024-05-30 Online:2024-06-18 Published:2024-07-05
  • Contact: Lin Zhao, Xintong Li, Xingjiang Zhou E-mail:lzhao@iphy.ac.cn;xintongli@iphy.ac.cn;XJZhou@iphy.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12488201, 12374066, 12074411, and 12374154), the National Key Research and Development Program of China (Grant Nos. 2021YFA1401800, 2022YFA1604200, 2022YFA1403900, and 2023YFA1406000), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant Nos. XDB25000000 and XDB33000000), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0301800), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. Y2021006), and the Synergetic Extreme Condition User Facility (SECUF).

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摘要： In high temperature cuprate superconductors, it was found that the superfluid density decreases with the increase of hole doping. One natural question is whether there exists normal fluid in the superconducting state in the overdoped region. In this paper, we have carried out high-resolution ultra-low temperature laser-based angle-resolved photoemission measurements on a heavily overdoped Bi2212 sample with a $T_\mathrm{c}$ of 48K. We find that this heavily overdoped Bi2212 remains in the strong coupling regime with $2 \varDelta_0 / (k_{\mathrm{B}} T_{\mathrm{c}})=5.8$. The single-particle scattering rate is very small along the nodal direction ($\sim$5meV) and increases as the momentum moves from the nodal to the antinodal regions. A hard superconducting gap opening is observed near the antinodal region with the spectral weight at the Fermi level fully suppressed to zero. The normal fluid is found to be negligibly small in the superconducting state of this heavily overdoped Bi2212. These results provide key information to understand the high $T_\mathrm{c}$ mechanism in the cuprate superconductors.

关键词: cuprate superconductor, angle-resolved photoemission spectroscopy, electronic structure

Abstract: In high temperature cuprate superconductors, it was found that the superfluid density decreases with the increase of hole doping. One natural question is whether there exists normal fluid in the superconducting state in the overdoped region. In this paper, we have carried out high-resolution ultra-low temperature laser-based angle-resolved photoemission measurements on a heavily overdoped Bi2212 sample with a $T_\mathrm{c}$ of 48K. We find that this heavily overdoped Bi2212 remains in the strong coupling regime with $2 \varDelta_0 / (k_{\mathrm{B}} T_{\mathrm{c}})=5.8$. The single-particle scattering rate is very small along the nodal direction ($\sim$5meV) and increases as the momentum moves from the nodal to the antinodal regions. A hard superconducting gap opening is observed near the antinodal region with the spectral weight at the Fermi level fully suppressed to zero. The normal fluid is found to be negligibly small in the superconducting state of this heavily overdoped Bi2212. These results provide key information to understand the high $T_\mathrm{c}$ mechanism in the cuprate superconductors.

Key words: cuprate superconductor, angle-resolved photoemission spectroscopy, electronic structure

中图分类号:  (Cuprate superconductors)

  • 74.72.-h
74.25.Jb (Electronic structure (photoemission, etc.)) 79.60.-i (Photoemission and photoelectron spectra)