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

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 Yang, Chuangtian Chen, Zuyan Xu, T. K. Lee and X. J. Zhou ()
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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

Nature Communications, 2013, vol. 4, issue 1, 1-8

Abstract: 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.

Date: 2013
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DOI: 10.1038/ncomms3459

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