Sajitha, E. P. ; Prasad, V. ; Subramanyam, S. V. (2009) Low temperature electrical transport properties of carbon matrix containing iron nanoparticles Journal of Applied Physics, 105 (7). 073708_1-073708_6. ISSN 0021-8979
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Official URL: http://jap.aip.org/resource/1/japiau/v105/i7/p0737...
Related URL: http://dx.doi.org/10.1063/1.3095762
Abstract
We present a comparative study of the low temperature electrical transport properties of the carbon matrix containing iron nanoparticles and the films. The conductivity of the nanoparticles located just below the metal-insulator transition exhibits metallic behavior with a logarithmic temperature dependence over a large temperature interval. The zero-field conductivity and the negative magnetoresistance, showing a characteristic upturn at liquid helium temperature, are consistently explained by incorporating the Kondo relation and the two dimensional electron-electron interaction. The films, in contrast, exhibit a crossover of the conductivity from power-law dependence at high temperatures to an activated hopping law dependence in the low temperature region. The transition is attributed to changes in the energy dependence of the density of states near the Fermi level. The observed magnetoresistance is discussed in terms of quantum interference effect on a three-dimensional variable range hopping mechanism.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Institute of Physics. |
Keywords: | Carbon; Electronic Density of States; Ferromagnetic Materials; Hopping Conduction; Iron; Magnetic Particles; Magnetoresistance; Metal-insulator Transition; Nanoparticles; Quantum Interference Phenomena; Thin Films |
ID Code: | 51424 |
Deposited On: | 28 Jul 2011 11:42 |
Last Modified: | 28 Jul 2011 11:42 |
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