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Superconductivity effects near the metal-insulator transition in granular indium films

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Abstract

The paper reports on an investigation of the electric resistance as a function of temperatureT, magnetic fieldH, and applied voltageV in granular indium films when approaching the metal-insulator transition (MIT) due to increased thickness of the oxide layers between granules. The dependences are shown to be governed atT≤5 K by competition of the hopping conductivity and the Josephson tunneling of electrons, sometimes giving rise to a resistance minimum inR(T) associated with superconductivity. It was also found that even when the intergranular Josephson tunneling is totally suppressed, transition of granules to the superconducting state influences essentially the dependencesR(T, H), changing the functional form ofR(T) and resulting in anomalously high negative magnetoresistance. This is shown to stem from the change of the character of activated electron tunneling as the granules become superconducting.

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Authors and Affiliations

  1. Institute for Low Temperature Physics and Engineering, Ukrainian SSR Academy of Sciences, Kharkov, USSR

    B. I. Belevtsev, Yu. F. Komnik & A. V. Fomin

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  1. B. I. Belevtsev
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  2. Yu. F. Komnik
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  3. A. V. Fomin
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Belevtsev, B.I., Komnik, Y.F. & Fomin, A.V. Superconductivity effects near the metal-insulator transition in granular indium films. J Low Temp Phys 69, 401–417 (1987). https://doi.org/10.1007/BF00683330

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  • DOI: https://doi.org/10.1007/BF00683330

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