Metal-insulator transitions in pressed pellets of BF4 - doped poly(3-methylthiophene)
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Data
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Coorientador
Pós-graduação
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Editor
Taylor & Francis
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Artigo
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Acesso restrito
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Resumo
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.
Descrição
Palavras-chave
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
Idioma
Inglês
Citação
Phase Transitions, v. 62, n. 3 SEC. A, p. 157-165, 1997.
