Nuclear Physics and Atomic Energy

Ядерна фізика та енергетика
Nuclear Physics and Atomic Energy

  ISSN: 1818-331X (Print), 2074-0565 (Online)
  Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine
  Languages: Ukrainian, English
  Periodicity: 4 times per year

  Open access peer reviewed journal

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Nucl. Phys. At. Energy 2001, volume 2, issue 3, pages 100-104.
Section: Radiation Physics.
Received: 07.03.2001; Published online: 30.09.2001.
PDF Full text (ua)
https://doi.org/10.15407/jnpae2001.03.100

Conductivity of crystals with superconducting nanoscale inclusions

V. I. Sugakov, O. N. Shevtsova

Institute for Nuclear Research of the National Academy of Sciences of Ukraine, Kyiv, Ukraine

Abstract: A system of superconducting inclusions, which are immersed in a dielectric matrix has been studied. In the assumption that inclusion radius is less or of order of coherence length a critical magnetic field of spherical isolated inclusion was determined. A temperature dependence of conductivity and conductivity as a function of magnetic field for a crystal with superconducting inclusions has been calculated. In the calculations the assumption was made that inclusion concentration is insufficient for onset of superconductivity in a whole sample (i.e. below threshold of percolation). It was shown that the presence of superconducting inclusions leads to the sharp increasing of conductivity of a sample at low temperatures, and to strong dependence of conductivity upon the magnetic field (magnetoresistance). Magnetoresistance is caused by superconductivity suppression in inclusions with increasing magnetic field. The influence of dispersion of inclusion sizes on the conductivity as a function of temperature and of magnetic field have been studied.

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