Metallic transport, magnetic susceptibility and reflectance spectra in heavily doped PPY(PF/sub 6/)

Summary form only given. We summarize some metallic features observed in heavily doped polypyrrole-hexafluorophosphate, PPy(PF/sub 6/). Measurements of the conductivity, thermoelectric power, electron spin resonance (ESR) and optical reflectance are carried out for the electroclunically prepared sample at low temperature (-40/spl deg/C), with the characteristic resistivity ratio P/sub r/=P(1.4K)/P(300K)=l.8. The sample shows a positive temperature coefficient of the resistivity (TCR) at temperatures below T/spl ap/15K. The thermoelectric power (S) increases linearly in proportion to the temperature, with S /spl ap/ 7 /spl mu/V/K at room temperature. High reflectance in far IR as well as a plasma resonance around 1.7 eV were observed in reflectance measurement. The temperature independent paramagnetic susceptibility down to 50K also confirms the existence of finite density of states at Fermi level. The results suggest that the electronic structure of PPy(PF/sub 6/) is characteristic of a disordered metal.