Superconductivity in two-dimensional CoO2 layers

Kazunori Takada (), Hiroya Sakurai, Eiji Takayama-Muromachi, Fujio Izumi, Ruben A. Dilanian and Takayoshi Sasaki
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Kazunori Takada: Advanced Materials Laboratory, National Institute for Materials Science
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

Nature, 2003, vol. 422, issue 6927, 53-55

Abstract: 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.

Date: 2003
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DOI: 10.1038/nature01450

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