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Unveiling phase diagram of the lightly doped high-Tc cuprate superconductors with disorder removed

Author

Listed:
  • Kifu Kurokawa

    (University of Tokyo)

  • Shunsuke Isono

    (Tokyo University of Science)

  • Yoshimitsu Kohama

    (University of Tokyo)

  • So Kunisada

    (University of Tokyo)

  • Shiro Sakai

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Ryotaro Sekine

    (Tokyo University of Science)

  • Makoto Okubo

    (Tokyo University of Science)

  • Matthew D. Watson

    (Diamond Light Source)

  • Timur K. Kim

    (Diamond Light Source)

  • Cephise Cacho

    (Diamond Light Source)

  • Shik Shin

    (University of Tokyo
    Office of University Professor, University of Tokyo)

  • Takami Tohyama

    (Tokyo University of Science)

  • Kazuyasu Tokiwa

    (Tokyo University of Science)

  • Takeshi Kondo

    (University of Tokyo
    The University of Tokyo)

Abstract

The currently established electronic phase diagram of cuprates is based on a study of single- and double-layered compounds. These CuO2 planes, however, are directly contacted with dopant layers, thus inevitably disordered with an inhomogeneous electronic state. Here, we solve this issue by investigating a 6-layered Ba2Ca5Cu6O12(F,O)2 with inner CuO2 layers, which are clean with the extremely low disorder, by angle-resolved photoemission spectroscopy (ARPES) and quantum oscillation measurements. We find a tiny Fermi pocket with a doping level less than 1% to exhibit well-defined quasiparticle peaks which surprisingly lack the polaronic feature. This provides the first evidence that the slightest amount of carriers is enough to turn a Mott insulating state into a metallic state with long-lived quasiparticles. By tuning hole carriers, we also find an unexpected phase transition from the superconducting to metallic states at 4%. Our results are distinct from the nodal liquid state with polaronic features proposed as an anomaly of the heavily underdoped cuprates.

Suggested Citation

  • 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.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39457-7
    DOI: 10.1038/s41467-023-39457-7
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    References listed on IDEAS

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