Negligible normal fluid in superconducting state of heavily overdoped Bi_(2)Sr_(2)CaCu_(2)O_(8+δ) detected by ultra-low temperature angle-resolved photoemission spectroscopy  

作　　者：殷超辉 汪清泓 解于洋 陈逸雯 刘俊豪 杨鉴刚 贾俊杰 张杏 吕文凯 闫宏涛 戎洪涛 张申金 王志敏 宗楠 刘丽娟 李如康 王晓洋 张丰丰 杨峰 彭钦军 许祖彦 刘国东 毛寒青 赵林 李昕彤 周兴江 Chaohui Yin;Qinghong Wang;Yuyang Xie;Yiwen Chen;Junhao Liu;Jiangang Yang;Junjie Jia;Xing Zhang;Wenkai Lv;Hongtao Yan;Hongtao Rong;Shenjin Zhang;Zhimin Wang;Nan Zong;Lijuan Liu;Rukang Li;Xiaoyang Wang;Fengfeng Zhang;Feng Yang;Qinjun Peng;Zuyan Xu;Guodong Liu;Hanqing Mao;Lin Zhao;Xintong Li;Xingjiang Zhou(National Laboratory for Superconductivity,Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[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

出　　处：《Chinese Physics B》2024年第7期562-567,共6页中国物理B（英文版）

基　　金：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);the Synergetic Extreme Condition User Facility(SECUF)。

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_(c) of 48 K.We find that this heavily overdoped Bi2212 remains in the strong coupling regime with 2Δ_(0)/(k_(B)T_(c))=5.8.The single-particle scattering rate is very small along the nodal direction(~5 meV) 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_(c) mechanism in the cuprate superconductors.

关 键 词：cuprate superconductor angle-resolved photoemission spectroscopy electronic structure 

分 类 号：O469[理学—凝聚态物理]