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The effects of pressure and magnetic field on the conductivity of FeCl4 doped polyacetylene: The influence of scattering by low-energy excitations

Title
The effects of pressure and magnetic field on the conductivity of FeCl4 doped polyacetylene: The influence of scattering by low-energy excitations
Authors
Aleshin A.N.Kim T.J.Suh D.-S.Park Y.W.Kang H.Kang W.
Ewha Authors
강원
SCOPUS Author ID
강원scopus
Issue Date
2002
Journal Title
International Journal of Modern Physics B
ISSN
0217-9792JCR Link
Citation
vol. 16, no. 20-22, pp. 3097 - 3100
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The effects of hydrostatic pressure and magnetic field on the conductivity of oriented polyacetylene films doped with FeC14- up to metallic state have been studied at T = 0.35-300 K. It was found that application of pressure up to 10 kBar increases the conductivity at 300 K by a factor of 1.3 and suppresses the resistivity minimum in ρ(T) at 270 - 280 K. At T < 2 K the temperature dependence of resistivity ρ(T) ∼ In T (at ambient pressure and at 10 kBar) which remains unaltered by a magnetic field up to 14 Tesla. Transverse magnetoresistance (MR) was found to be negative, linear and temperature independent at T < 2 K (at ambient and high pressure). We attribute the observed ρ(T) and MR behavior to weak localization accompanied by effect of electron dephasing time saturation due to scattering by two-level systems of a special type. More strong behavior of ρ(T) and MR at T > 2 K related to further suppression of weak localization due to scattering by low-energy excitations of a "glassy" type.
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자연과학대학 > 물리학전공 > Journal papers
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