Interlayer tunneling spectroscopy and doping-dependent energy-gap structure of the trilayer superconductor Bi2Sr2Ca2Cu3O10+δ

Yoshiharu Yamada, Kenkichi Anagawa, Takasada Shibauchi, Takenori Fujii, Takao Watanabe, Azusa Matsuda, and Minoru Suzuki
Phys. Rev. B 68, 054533 – Published 29 August 2003
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Abstract

The superconducting gap, the pseudogap, and their doping and temperature dependences have been measured by the short-pulse interlayer tunneling spectroscopy for the CuO2 triple-layer highTc superconducting Bi2Sr2Ca2Cu3O10+δ system. It is found for a nearly optimally doped sample that the superconducting gap magnitude is 80meV and the pseudogap is ≈120 meV, the values of which are slightly larger than those for CuO2 double-layer system. Both gap magnitudes show a clear tendency to decrease with increasing doping. In an underdoped sample, a clear dip-and-hump structure is observed, which declines with increasing doping and tends to diminish in overdoped samples. The relationship between unchanged Tc and decreasing superconducting gap in the overdoped region is discussed in terms of the proximity effect applied to the inequivalent doping model. We also discuss the dip-and-hump structure in comparison with other spectroscopic results. Finally, we argue an important implication of the increasing maximum Josephson current and the decreasing superconducting gap magnitude, both with increasing doping.

  • Received 7 December 2002

DOI:https://doi.org/10.1103/PhysRevB.68.054533

©2003 American Physical Society

Authors & Affiliations

Yoshiharu Yamada1, Kenkichi Anagawa1, Takasada Shibauchi1, Takenori Fujii2,*, Takao Watanabe3,†, Azusa Matsuda3,2, and Minoru Suzuki1,‡

  • 1Department of Electronic Science and Engineering, Kyoto University, Kyoto 606-8501, Japan
  • 2Department of Applied Physics, Faculty of Science, Tokyo University of Science, Tokyo 162-8601, Japan
  • 3NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan

  • *Present address: Department of Applied Physics, School of Science and Engineering, Waseda University, Tokyo 169-8555, Japan.
  • Present address: NTT Photonics Laboratories, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan.
  • Corresponding author. Electronic address: suzuki@kuee.kyoto-u.ac.jp

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Vol. 68, Iss. 5 — 1 August 2003

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