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Disappearance of nodal gap across the insulator–superconductor transition in a copper-oxide superconductor

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  • Yingying Peng

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Jianqiao Meng

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Daixiang Mou

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Junfeng He

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Lin Zhao

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Yue Wu

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Guodong Liu

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Xiaoli Dong

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Shaolong He

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Jun Zhang

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

  • Xiaoyang Wang

    (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

  • Qinjun Peng

    (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

  • Zhimin Wang

    (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

  • Shenjin Zhang

    (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

  • Feng Yang

    (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

  • Chuangtian Chen

    (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

  • Zuyan Xu

    (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

  • T. K. Lee

    (Institute of Physics, Academia Sinica)

  • X. J. Zhou

    (National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)

Abstract

The parent compound of the copper-oxide high-temperature superconductors is a Mott insulator. Superconductivity is realized by doping an appropriate amount of charge carriers. How a Mott insulator transforms into a superconductor is crucial in understanding the unusual physical properties of high-temperature superconductors and the superconductivity mechanism. Here we report high-resolution angle-resolved photoemission measurement on heavily underdoped Bi2Sr2–xLaxCuO6+δ system. The electronic structure of the lightly doped samples exhibit a number of characteristics: existence of an energy gap along the nodal direction, d-wave-like anisotropic energy gap along the underlying Fermi surface, and coexistence of a coherence peak and a broad hump in the photoemission spectra. Our results reveal a clear insulator–superconductor transition at a critical doping level of ~0.10 where the nodal energy gap approaches zero, the three-dimensional antiferromagnetic order disappears, and superconductivity starts to emerge. These observations clearly signal a close connection between the nodal gap, antiferromagnetism and superconductivity.

Suggested Citation

  • Yingying Peng & Jianqiao Meng & Daixiang Mou & Junfeng He & Lin Zhao & Yue Wu & Guodong Liu & Xiaoli Dong & Shaolong He & Jun Zhang & Xiaoyang Wang & Qinjun Peng & Zhimin Wang & Shenjin Zhang & Feng Y, 2013. "Disappearance of nodal gap across the insulator–superconductor transition in a copper-oxide superconductor," Nature Communications, Nature, vol. 4(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3459
    DOI: 10.1038/ncomms3459
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    Cited by:

    1. Changwei Zou & Jaewon Choi & Qizhi Li & Shusen Ye & Chaohui Yin & Mirian Garcia-Fernandez & Stefano Agrestini & Qingzheng Qiu & Xinqiang Cai & Qian Xiao & Xingjiang Zhou & Ke-Jin Zhou & Yayu Wang & Yi, 2024. "Evolution from a charge-ordered insulator to a high-temperature superconductor in Bi2Sr2(Ca,Dy)Cu2O8+δ," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Kifu Kurokawa & Shunsuke Isono & Yoshimitsu Kohama & So Kunisada & Shiro Sakai & Ryotaro Sekine & Makoto Okubo & Matthew D. Watson & Timur K. Kim & Cephise Cacho & Shik Shin & Takami Tohyama & Kazuyas, 2023. "Unveiling phase diagram of the lightly doped high-Tc cuprate superconductors with disorder removed," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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