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

IF 1.5 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Chinese Physics B Pub Date : 2024-07-01 DOI:10.1088/1674-1056/ad51f8

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

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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_c of 48 K. We find that this heavily overdoped Bi2212 remains in the strong coupling regime with 2Δ₀/(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.

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超低温角分辨光发射光谱探测到重度过掺杂 Bi2Sr2CaCu2O8+δ 超导态中的微量正流体

在高温杯状超导体中，人们发现超流体密度会随着空穴掺杂量的增加而降低。一个自然的问题是，在过掺杂区的超导态中是否存在正常流体。在本文中，我们对 Tc 为 48 K 的重度过掺杂 Bi2212 样品进行了基于激光的高分辨率超低温角度分辨光发射测量。沿节点方向的单粒子散射率非常小（∼5 meV），随着动量从节点区域移动到反节点区域，单粒子散射率逐渐增大。在反结区附近观察到硬超导间隙打开，费米级的光谱权重被完全抑制为零。在这种重度过掺杂的 Bi2212 的超导状态下，正常流体小到可以忽略不计。这些结果为理解杯状超导体的高 Tc 机制提供了关键信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chinese Physics B 物理-物理：综合

CiteScore

2.80

自引率

23.50%

发文量

15667

审稿时长

2.4 months

期刊介绍： Chinese Physics B is an international journal covering the latest developments and achievements in all branches of physics worldwide (with the exception of nuclear physics and physics of elementary particles and fields, which is covered by Chinese Physics C). It publishes original research papers and rapid communications reflecting creative and innovative achievements across the field of physics, as well as review articles covering important accomplishments in the frontiers of physics. Subject coverage includes: Condensed matter physics and the physics of materials Atomic, molecular and optical physics Statistical, nonlinear and soft matter physics Plasma physics Interdisciplinary physics.