Percolation and weak localization in thin discontinuous aluminum films

Kazumasa Yamada, Bunjyu Shinozaki, Takasi Kawaguti

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


In order to investigate the crossover from the homogeneous behavior to percolative one for two-dimensional system, the temperature T and magnetic field H dependence of the sheet resistance Rsq have been measured for thin granular aluminum films. In a magnetic field of 5 T, the conductance σ decreases with decreasing T as σ = αTe2/(2π2ℏ)lnT + σ0 due to weak localization effect. The value of αT decreases when Rsq increases beyond 6∼8 kΩ. In the network which does not contain loops smaller than the phase relaxation length, weak localization effect is considered to be suppressed. We have obtained the anomalous T-dependent diffusion constant D from the analysis of the magnetoconductance above TC with use of the fitting parameter D(T). These behaviors can be explained qualitatively by a model of scaling law for percolation.

Original languageEnglish
Pages (from-to)286-287
Number of pages2
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number1-3
Publication statusPublished - May 2003
Event23rd International Conference on Low Temperature Physics - Hiroshima, Japan
Duration: Aug 20 2002Aug 27 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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