ESR LINEWIDTH IN CONDUCTING POLYMERS WITH 5-MEMBERED RING

The ESR linewidths in polythiophene, poly(3-methylthiophene) and polyp yrrole doped with ClO4- and AsF6- were measured as a function of tempe rature to study the dynamics of charged carriers with spin. The temper ature dependence of the ESR linewidth can be understood in terms of th e Elliott mechanism, characteristic for metallic electrons. Such an in terpretation leads us to conclude that the electron scattering is not governed by potential of dopants, but by that on polymer backbone. In addition, the temperature dependence of the resistance ratio r(VSC) ob tained by voltage-shorted-compaction method was found to coincide with that of the linewidth qualitatively. We show that a simple one-dimens ional model for the resistivity that takes the electron scattering onl y by 2k(F)-phonons into consideration can qualitatively well explain b oth the data.