Ordering and manipulation of the magnetic moments in large-scale superconducting pi-loop arrays

Johannes W.M. Hilgenkamp, A. Ariando, H.J.H. Smilde, David H.A. Blank, Augustinus J.H.M. Rijnders, Horst Rogalla, J.R. Kirtley, John R. Kirtley, Chang C. Tseui

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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 NaxCoO2dotyH2O (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
Original languageUndefined
Pages (from-to)50-53
Number of pages4
Publication statusPublished - 2003


  • IR-40525
  • METIS-212107

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