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Superconductivity in two-dimensional CoO2 layers

Author

Listed:
  • Kazunori Takada

    (Advanced Materials Laboratory, National Institute for Materials Science
    CREST, Japan Science and Technology Corporation)

  • Hiroya Sakurai

    (Superconducting Materials Center, National Institute for Materials Science)

  • Eiji Takayama-Muromachi

    (Superconducting Materials Center, National Institute for Materials Science)

  • Fujio Izumi

    (Advanced Materials Laboratory, National Institute for Materials Science)

  • Ruben A. Dilanian

    (Advanced Materials Laboratory, National Institute for Materials Science)

  • Takayoshi Sasaki

    (Advanced Materials Laboratory, National Institute for Materials Science
    CREST, Japan Science and Technology Corporation)

Abstract

Since the discovery of high-transition-temperature (high-Tc) superconductivity in layered copper oxides1, many researchers have searched for similar behaviour in other layered metal oxides involving 3d-transition metals, such as cobalt and nickel. Such attempts have so far failed, with the result that the copper oxide layer is thought to be essential for superconductivity. Here we report that NaxCoO2·yH2O (x ≈ 0.35, y ≈ 1.3) is a superconductor with a Tc of about 5 K. This compound consists of two-dimensional CoO2 layers separated by a thick insulating layer of Na+ ions and H2O molecules. There is a marked resemblance in superconducting properties between the present material and high-Tc copper oxides, suggesting that the two systems have similar underlying physics.

Suggested Citation

  • Kazunori Takada & Hiroya Sakurai & Eiji Takayama-Muromachi & Fujio Izumi & Ruben A. Dilanian & Takayoshi Sasaki, 2003. "Superconductivity in two-dimensional CoO2 layers," Nature, Nature, vol. 422(6927), pages 53-55, March.
    • Handle: RePEc:nat:nature:v:422:y:2003:i:6927:d:10.1038_nature01450
    DOI: 10.1038/nature01450
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    Cited by:

    1. Gomez, J.A. & Larkin, I. & Schwingenschlögl, U., 2010. "First-principles calculations of the YBa2Cu3O7/PrBa2Cu3O7 interface," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 80(7), pages 1499-1508.
    2. Zhang, T., 2016. "New thinking on modeling of thermoelectric devices," Applied Energy, Elsevier, vol. 168(C), pages 65-74.

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