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Resistivity and magnetoresistivity near the metal-insulator and superconductor-insulator transition in granular Al-Ge

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  • Eytan, G.
  • Zaken, E.
  • Rosenbaum, R.
  • McLachlan, D.S.
  • Albers, A.

Abstract

Granular Al-Ge films, just on the metallic side of the critical volume fraction φc (50.7% Al), are found to have critical fields in excess of 1.5T at 0.47 K due to the fine granular nature of the Al. In barely insulating films where φc − φ < 2.2% (φ is the volume fraction of aluminum), Josephson junction coupling dominates the behaviour below Tc. For 3.4% ⩽ (φ − φ) ⩽ 6.2%, the resistivity diverges strongly below Tc and a large negative magnetoresistivity (MR) is observed. This behaviour is explained in terms of quasiparticle tunnelling or alternatively by the Adkins charging model. The high negative MR is explained using a magnetic field-dependent superconducting energy gap. The normal resistivity in the insulating films obeys the hopping relation ρ = ρ0 exp(T0/T)x above Tc and also below Tc in a field of 3.45 T, which quenches all superconductivity in the Al below Tc = 1.61 K.

Suggested Citation

  • Eytan, G. & Zaken, E. & Rosenbaum, R. & McLachlan, D.S. & Albers, A., 1994. "Resistivity and magnetoresistivity near the metal-insulator and superconductor-insulator transition in granular Al-Ge," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 207(1), pages 240-244.
    • Handle: RePEc:eee:phsmap:v:207:y:1994:i:1:p:240-244
    DOI: 10.1016/0378-4371(94)90379-4
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    1. Rothberg, J.M. & Chloupek, R.J., 1978. "A longitudinal study of military performance subsequent to civilian drug use," American Journal of Public Health, American Public Health Association, vol. 68(8), pages 743-747.
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    1. Rosenbaum, Ralph L. & Slutzky, Michael & McLachlan, D.S. & Möbius, Arnulf, 1994. "Various methods for determining the critical metallic volume fraction φc at the metal-insulator transition," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 207(1), pages 384-390.

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