Percolation and weak localization in thin discontinuous aluminum films

Kazumasa Yamada; Bunjyu Shinozaki; Takasi Kawaguti

doi:10.1016/S1386-9477(02)01020-2

Percolation and weak localization in thin discontinuous aluminum films

Kazumasa Yamada, Bunjyu Shinozaki, Takasi Kawaguti

Condensed Matter Physics

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

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 R_sq have been measured for thin granular aluminum films. In a magnetic field of 5 T, the conductance σ decreases with decreasing T as σ = α_Te²/(2π²ℏ)lnT + σ₀ due to weak localization effect. The value of α_T decreases when R_sq 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 T_C with use of the fitting parameter D(T). These behaviors can be explained qualitatively by a model of scaling law for percolation.

Original language	English
Pages (from-to)	286-287
Number of pages	2
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	18
Issue number	1-3
DOIs	https://doi.org/10.1016/S1386-9477(02)01020-2
Publication status	Published - May 2003
Event	23rd International Conference on Low Temperature Physics - Hiroshima, Japan Duration: Aug 20 2002 → Aug 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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10.1016/S1386-9477(02)01020-2

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title = "Percolation and weak localization in thin discontinuous aluminum films",

abstract = "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.",

author = "Kazumasa Yamada and Bunjyu Shinozaki and Takasi Kawaguti",

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T1 - Percolation and weak localization in thin discontinuous aluminum films

AU - Yamada, Kazumasa

AU - Shinozaki, Bunjyu

AU - Kawaguti, Takasi

PY - 2003/5

Y1 - 2003/5

N2 - 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.

AB - 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.

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DO - 10.1016/S1386-9477(02)01020-2

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SN - 1386-9477

VL - 18

SP - 286

EP - 287

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 1-3

T2 - 23rd International Conference on Low Temperature Physics

Y2 - 20 August 2002 through 27 August 2002

ER -

Percolation and weak localization in thin discontinuous aluminum films

Abstract

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