1f Noise of Granular Metal-Insulator Composites

Joseph V. Mantese and Watt W. Webb
Phys. Rev. Lett. 55, 2212 – Published 11 November 1985
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Abstract

The resistivity ρ varies by 7 decades and the intensity of its fluctuations [Sρ(f)]1Hz varies by 17 decades in composite films of Pt and Al2O3 for a wide range of metal volume percent 33%<~p<~100% and temperature 7<T<300 K. The power spectral density Sρ(f)1fα(1f noise) with 0.8<α<1.2 at all T and p. The normalized noise intensity [fSρ(f)ρ2]1Hz rises by 105 with decreasing p and saturates below a metal-insulator transition, p<~50%. Results implicate a dual conduction mechanism for composites combining noisy tunneling and quiet metallic paths.

  • Received 26 August 1985

DOI:https://doi.org/10.1103/PhysRevLett.55.2212

©1985 American Physical Society

Authors & Affiliations

Joseph V. Mantese

  • Department of Physics, Cornell University, Ithaca, New York 14853

Watt W. Webb

  • School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853

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Vol. 55, Iss. 20 — 11 November 1985

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