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<p>We performed angle-resolved photoemission spectroscopy studies on the triple-layer Bi<sub>2</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10+<i>δ</i></sub> over a wide doping range. Although the doping level of the inner CuO<sub>2</sub> plane is extremely low in underdoped samples, the <i>d</i>-wave SC gap is enhanced to the unprecedentedly large value of Δ<sub>0</sub> ~ 80–100 meV at the antinode. This gap persists well above <i>T</i><sub><i>c</i></sub> without a Fermi arc, indicating a “nodal metal”. We attribute the nodal metallic behavior to the unique local environment of the inner clean CuO<sub>2</sub> plane, sandwiched by nearly optimally-doped two outer planes and hence subject to strong proximity effect from both sides. In the nodal metal, quasiparticle peaks show electron-hole symmetry, suggesting <i>d</i>-wave pairing fluctuations. Thus the proximity effect on the innermost CuO<sub>2</sub> plane is the strongest in the triple-layer cuprates, which explains why the <i>T</i><sub><i>c</i></sub> reaches the maximum at the layer number of three in every multi-layer cuprate family.</p>

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Proximity-induced nodal metal in an extremely underdoped CuO2 plane in triple-layer cuprates

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月27日

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  • Shin-ichiro Ideta,
  • Shintaro Adachi,
  • Takashi Noji,
  • Shunpei Yamaguchi,
  • Nae Sasaki,
  • Shigeyuki Ishida,
  • Shin-ichi Uchida,
  • Takenori Fujii,
  • Takao Watanabe,
  • Wen O. Wang,
  • Brian Moritz,
  • Thomas P. Devereaux,
  • Masashi Arita,
  • Chung-Yu Mou,
  • Teppei Yoshida,
  • Kiyohisa Tanaka,
  • Ting-Kuo Lee,
  • Atsushi Fujimori

摘要

We performed angle-resolved photoemission spectroscopy studies on the triple-layer Bi2Sr2Ca2Cu3O10+δ over a wide doping range. Although the doping level of the inner CuO2 plane is extremely low in underdoped samples, the d-wave SC gap is enhanced to the unprecedentedly large value of Δ0 ~ 80–100 meV at the antinode. This gap persists well above Tc without a Fermi arc, indicating a “nodal metal”. We attribute the nodal metallic behavior to the unique local environment of the inner clean CuO2 plane, sandwiched by nearly optimally-doped two outer planes and hence subject to strong proximity effect from both sides. In the nodal metal, quasiparticle peaks show electron-hole symmetry, suggesting d-wave pairing fluctuations. Thus the proximity effect on the innermost CuO2 plane is the strongest in the triple-layer cuprates, which explains why the Tc reaches the maximum at the layer number of three in every multi-layer cuprate family.