Effects of pressure and magnetic field on the low-temperature conductivity of FeCl - 4 -doped polyacetylene: The influence of scattering by low-energy excitations

摘要: The effects of hydrostatic pressure and magnetic field on the low-temperature conductivity oriented polyacetylene doped with FeCl{sub 4}{sup {minus}} up to a metallic state have been investigated. It was found that at 10 kbar is greater than ambient by factor 1.3. Application suppresses resistivity minimum 280 K decreases ratio {rho}{sub r}={rho}(0.37 K)/{rho}(300 K) from 2.4 down 1.9. temperature dependence {rho}(T){similar_to}lnT temperatures below 1 kbar, which remains almost unaltered 14 T. starting logarithmic shifts higher temperatures. Transverse magnetoresistance (MR) be negative, linear, temperature-independent 2 K. low {rho}(T) MR behavior T{lt}1 observed in heavily has attributed weak localization. We assumed dramatic increase inelastic scattering due low-energy vibrational excitation can ascribe stronger T{gt}2 as result further suppression localization more effective dephasingmore » effect. At temperature, decrease dominated activation additional conduction paths.« less