Emergent normal fluid in the superconducting ground state of overdoped cuprates

Shusen Ye, Miao Xu, Hongtao Yan, Zi-Xiang Li, Changwei Zou, Xintong Li, Zhenqi Hao, Chaohui Yin, Yiwen Chen, Xingjiang Zhou, Dung-Hai Lee and Yayu Wang ()
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Shusen Ye: Tsinghua University
Miao Xu: Tsinghua University
Hongtao Yan: Chinese Academy of Sciences
Zi-Xiang Li: Chinese Academy of Sciences
Changwei Zou: Tsinghua University
Xintong Li: Tsinghua University
Zhenqi Hao: Tsinghua University
Chaohui Yin: Chinese Academy of Sciences
Yiwen Chen: Chinese Academy of Sciences
Xingjiang Zhou: Chinese Academy of Sciences
Dung-Hai Lee: University of California
Yayu Wang: Tsinghua University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract The microscopic mechanism for the disappearance of superconductivity in overdoped cuprates is still under heated debate. Here we use scanning tunneling spectroscopy to investigate the evolution of quasiparticle interference phenomenon in Bi2Sr2CuO6+δ over a wide range of hole densities. We find that when the system enters the overdoped regime, a peculiar quasiparticle interference wavevector with arc-like pattern starts to emerge even at zero bias, and its intensity grows with increasing doping level. Its energy dispersion is incompatible with the octet model for d-wave superconductivity, but is highly consistent with the scattering interference of gapless normal carriers. The gapless quasiparticles are mainly located near the antinodes and are independent of temperature, consistent with the disorder scattering mechanism. We propose that a branch of normal fluid emerges from the pair-breaking scattering between flat antinodal bands in the quantum ground state, which is the primary cause for the reduction of superfluid density and suppression of superconductivity in overdoped cuprates.

Date: 2024
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DOI: 10.1038/s41467-024-49325-7

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