Metal-insulator transitions in pressed pellets of BF4 - doped poly(3-methylthiophene)

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Pawlicka, A.
Pereira, E. C.
Nascimento, O. R.
Bulhões, L. O. S.
Walmsley, L. [UNESP]
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From Electron Spin Resonance (ESR) data in pressed pellets of BF4 - doped Poly(3-methylthiophene) (P3MT) we obtained simultaneously the paramagnetic susceptibility and. the microwave conductivity. We observed a transition from a high-temperature insulator state to a room-temperature metallic state. Around 240K. evidence of a Peierls transition is observed, but if the sample is slowly cooled, this transition is partially suppressed. DC conductivity data taken with the sample quenched to 79 K show a non-linear I-V response for very small electric fields, suggesting depinning of Charge-Density Wave (CDW). The data for heating and cooling the system above room temperature, indicate the formation of bipolarons.
Charge-density waves, Conducting polymers, Electron spin resonance, Metal-insulator transitions, Aromatic compounds, Boron compounds, Conductive plastics, Electric conductivity of solids, Electron spin resonance spectroscopy, Microwave conductivity, Paramagnetic susceptibility, Peierls transition, Phase transitions
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Phase Transitions, v. 62, n. 3 SEC. A, p. 157-165, 1997.