Letter | Published:

Possible superconductivity at room temperature

Naturevolume 247pages358360 (1974) | Download Citation



IN this paper some observations are presented on an anomalous current in aluminum-carbon-aluminium (Al-C-Al) sandwiches, at room temperature, which in several respects behaves in the same way as the Josephson current might be expected to do. At first the switching effect was studied in Al-C-Al sandwiches discovered by Ovshinsky1 and Pearson2 in chalcogenide glasses and amorphous oxides. In carbon sandwiches subjected to proper electrical pulsing, changes in resistance of a factor of 1,000 were found, the changes being reversible and with a memory time of the order of a few days3.

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  1. 1

    Ovshinsky, S. R., Phys. Rev. Lett., 21, 1450 (1968).

  2. 2

    Pearson, A. D., and Miller, C. E., Appl. Phys. Lett., 14, 9 (1969).

  3. 3

    Antonowicz, K., Cacha, L., and Turlo, J., Carbon, 11, 1 (1973).

  4. 4

    Proc. Symp. Semiconductor Effects in Amorphous Solids (edit. by Doremus, W.) (North-Holland, Amsterdam, 1970).

  5. 5

    Pryor, R. W., and Theuisch, H. K., J. Non-crys. Solids, 7, 181 (1972).

  6. 6

    Josephson, B. D., Phys. Lett., 1, 251 (1962).

  7. 7

    Jaklewic, R. C., Lambe, J., Mercereau, J. E., and Silver, A. H., Phys. Rev., 140, A 1628 (1965).

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  1. Physical Institute, Nicolas Copernicus University, Torun, Poland



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