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

殷超辉 ¹汪清泓 ¹解于洋 ¹陈逸雯 ¹刘俊豪 ¹杨鉴刚 ¹贾俊杰 ¹张杏 ¹吕文凯 ¹闫宏涛 ¹戎洪涛 ¹张申金 ²王志敏 ²宗楠 ²刘丽娟 ²李如康 ²王晓洋 ²张丰丰 ²杨峰 ²彭钦军 ²许祖彦 ²刘国东 ³毛寒青 ³赵林 ³李昕彤 ³周兴江³

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作者信息

1. 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
2. Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China
3. 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;Songshan Lake Materials Laboratory,Dongguan 523808,China
折叠

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 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.

Key words

cuprate superconductor/angle-resolved photoemission spectroscopy/electronic structure

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基金项目

National Natural science Foundation of China(12488201)

National Natural science Foundation of China(12374066)

National Natural science Foundation of China(12074411)

National Natural science Foundation of China(12374154)

National Key Research and Development Program of China(2021YFA1401800)

National Key Research and Development Program of China(2022YFA1604200)

National Key Research and Development Program of China(2022YFA1403900)

National Key Research and Development Program of China(2023YFA1406000)

Strategic Priority Research Program(B)of the Chinese Academy of sciences(XDB25000000)

Strategic Priority Research Program(B)of the Chinese Academy of sciences(XDB33000000)

Innovation Program for Quantum Science and Technology(2021ZD0301800)

Youth Innovation Promotion Association of the Chinese Academy of Sciences(Y2021006)

Synergetic Extreme Condition User Facility(SECUF)()

出版年

2024

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

参考文献量19

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