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

被引:0
|
作者
Aleshin, AN [1 ]
Kim, TJ
Suh, DS
Park, YW
Kang, H
Kang, W
机构
[1] Seoul Natl Univ, Sch Phys, Seoul 151747, South Korea
[2] Seoul Natl Univ, Condensed Matter Res Inst, Seoul 151747, South Korea
[3] Ewha Womans Univ, Dept Phys, Seoul 120750, South Korea
来源
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2002年 / 16卷 / 20-22期
关键词
D O I
10.1142/S0217979202013651
中图分类号
O59 [应用物理学];
学科分类号
摘要
The effects of hydrostatic pressure and magnetic field on the conductivity of oriented polyacetylene films doped with FeCl4- 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 rho(T) at 270 - 280 K. At T < 2 K the temperature dependence of resistivity rho(T) - In T (at ambient pressure and at 10 kBar) which remains unaltered by a magnetic field up to 14 Testa. 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 &GT; 2 K related to further suppression of weak localization due to scattering by low-energy excitations of a "glassy" type.
引用
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页码:3097 / 3100
页数:4
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