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

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

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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 Tc of 48 K.We find that this heavily overdoped Bi2212 remains in the strong coupling regime with 2△0/(kBTc)=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 Tc mechanism in the cuprate superconductors.

cuprate superconductorangle-resolved photoemission spectroscopyelectronic structure

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

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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

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National Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaStrategic Priority Research Program(B)of the Chinese Academy of sciencesStrategic Priority Research Program(B)of the Chinese Academy of sciencesInnovation Program for Quantum Science and TechnologyYouth Innovation Promotion Association of the Chinese Academy of SciencesSynergetic Extreme Condition User Facility(SECUF)

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2024

10.1088/1674-1056/ad51f8

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(7)
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