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High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene

Author

Listed:
  • Da Jiang

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

  • Tao Hu

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

  • Lixing You

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

  • Qiao Li

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

  • Ang Li

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

  • Haomin Wang

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

  • Gang Mu

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

  • Zhiying Chen

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

  • Haoran Zhang

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

  • Guanghui Yu

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences)

  • Jie Zhu

    (Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University)

  • Qiujuan Sun

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
    School of Physics and Electronics, Central South University)

  • Chengtian Lin

    (Max-Planck-Institute für Festkörperforschung)

  • Hong Xiao

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

  • Xiaoming Xie

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
    School of Physical Science and Technology, ShanghaiTech University)

  • Mianheng Jiang

    (State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
    School of Physical Science and Technology, ShanghaiTech University)

Abstract

High-Tc superconductors confined to two dimension exhibit novel physical phenomena, such as superconductor–insulator transition. In the Bi2Sr2CaCu2O8+x (Bi2212) model system, despite extensive studies, the intrinsic superconducting properties at the thinness limit have been difficult to determine. Here, we report a method to fabricate high quality single-crystal Bi2212 films down to half-unit-cell thickness in the form of graphene/Bi2212 van der Waals heterostructure, in which sharp superconducting transitions are observed. The heterostructure also exhibits a nonlinear current–voltage characteristic due to the Dirac nature of the graphene band structure. More interestingly, although the critical temperature remains essentially the same with reduced thickness of Bi2212, the slope of the normal state T-linear resistivity varies by a factor of 4–5, and the sheet resistance increases by three orders of magnitude, indicating a surprising decoupling of the normal state resistance and superconductivity. The developed technique is versatile, applicable to investigate other two-dimensional (2D) superconducting materials.

Suggested Citation

  • Da Jiang & Tao Hu & Lixing You & Qiao Li & Ang Li & Haomin Wang & Gang Mu & Zhiying Chen & Haoran Zhang & Guanghui Yu & Jie Zhu & Qiujuan Sun & Chengtian Lin & Hong Xiao & Xiaoming Xie & Mianheng Jian, 2014. "High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene," Nature Communications, Nature, vol. 5(1), pages 1-6, December.
  • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6708
    DOI: 10.1038/ncomms6708
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    Cited by:

    1. Heng Wang & Yuying Zhu & Zhonghua Bai & Zechao Wang & Shuxu Hu & Hong-Yi Xie & Xiaopeng Hu & Jian Cui & Miaoling Huang & Jianhao Chen & Ying Ding & Lin Zhao & Xinyan Li & Qinghua Zhang & Lin Gu & X. J, 2023. "Prominent Josephson tunneling between twisted single copper oxide planes of Bi2Sr2-xLaxCuO6+y," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. Shuxu Hu & Jiabin Qiao & Genda Gu & Qi-Kun Xue & Ding Zhang, 2024. "Vortex entropy and superconducting fluctuations in ultrathin underdoped Bi2Sr2CaCu2O8+x superconductor," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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