Abstract
Quantum corrections (QC) to the resistivity due to weak localization (WL) and electron-electron interaction (EEI) have been measured for percolated metal networks with percolation coherence length ξ comparable to the quantum length scales — the phase-breaking length L φ and the thermal diffusion length L T. Far from the percolation metal-insulator transition (MIT) the “macroscopic” disorder is averaged over the quantum lengths (L φ, L T > ξ) and the QC are of the universal two-dimensional (2D) type with R □=R □(ξ), where R □(ξ) is the resistance per square at scales larger than ξ. A crossover 2D→1D in the dimensionality of the QC and the Nyquist phase-breaking mechanism is observed near the MIT, where ξ≫L φ,L T.
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