Logarithmic behavior of the conductivity of electron-beam deposited granular Pt C nanowires

L. Rotkina, S. Oh, J. N. Eckstein, Vyacheslav Rotkin

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

We found that granular Pt C composite nanowires have a logarithmic temperature dependence of conductivity in a wide range of temperatures. The logarithmic dependence can be explained by Coulomb interaction between Pt grains in a conductive carbon matrix. We stress the difference of the conductivity mechanism in the composite nanogranular material and known mechanisms in bulk metals/semiconductors and low-dimensional systems, including logarithmic dependence in systems with two-dimensional weak localization. Our observations show that local voltage fluctuations between grains result in the log(T) dependence for the samples with high conductivity (annealed nanowires), while the samples with low conductivity (as fabricated nanowires) appear to be insulators with a Coulomb gap.

Original languageEnglish (US)
Article number233407
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number23
DOIs
StatePublished - Dec 15 2005

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Nanowires
Electron beams
nanowires
electron beams
conductivity
low conductivity
composite materials
Composite materials
Coulomb interactions
Carbon
Metals
insulators
Semiconductor materials
Temperature
temperature dependence
carbon
Electric potential
electric potential
matrices
metals

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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Logarithmic behavior of the conductivity of electron-beam deposited granular Pt C nanowires. / Rotkina, L.; Oh, S.; Eckstein, J. N.; Rotkin, Vyacheslav.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 72, No. 23, 233407, 15.12.2005.

Research output: Contribution to journalArticle

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AB - We found that granular Pt C composite nanowires have a logarithmic temperature dependence of conductivity in a wide range of temperatures. The logarithmic dependence can be explained by Coulomb interaction between Pt grains in a conductive carbon matrix. We stress the difference of the conductivity mechanism in the composite nanogranular material and known mechanisms in bulk metals/semiconductors and low-dimensional systems, including logarithmic dependence in systems with two-dimensional weak localization. Our observations show that local voltage fluctuations between grains result in the log(T) dependence for the samples with high conductivity (annealed nanowires), while the samples with low conductivity (as fabricated nanowires) appear to be insulators with a Coulomb gap.

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