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dc.contributor.authorPawlicka, A.-
dc.contributor.authorPereira, E. C.-
dc.contributor.authorNascimento, O. R.-
dc.contributor.authorBulhões, L. O. S.-
dc.contributor.authorWalmsley, L.-
dc.identifier.citationPhase Transitions, v. 62, n. 3 SEC. A, p. 157-165, 1997.-
dc.description.abstractFrom 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.en
dc.subjectCharge-density waves-
dc.subjectConducting polymers-
dc.subjectElectron spin resonance-
dc.subjectMetal-insulator transitions-
dc.subjectAromatic compounds-
dc.subjectBoron compounds-
dc.subjectConductive plastics-
dc.subjectElectric conductivity of solids-
dc.subjectElectron spin resonance spectroscopy-
dc.subjectMicrowave conductivity-
dc.subjectParamagnetic susceptibility-
dc.subjectPeierls transition-
dc.subjectPhase transitions-
dc.titleMetal-insulator transitions in pressed pellets of BF4 - doped poly(3-methylthiophene)en
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationDepto. de Físico-Quim. Instituto de Química, C.P. 780-
dc.description.affiliationInst. de Fis. e Informática Universidade de São Paulo, C.P. 369, CEP 13560-970, S. Carlos, S.P.-
dc.description.affiliationDepartamento de Química Univ. Federal de São Carlos, C.P. 676, CEP 13565-970, S. Carlos, S.P.-
dc.description.affiliationDepartamento de Física Inst. de Geociencias e Cie. Exatas Universidade Estadual Paulista, C.P. 178, CEP 13500-970, Rio Clara, S.P.-
dc.description.affiliationUnespDepartamento de Física Inst. de Geociencias e Cie. Exatas Universidade Estadual Paulista, C.P. 178, CEP 13500-970, Rio Clara, S.P.-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofPhase Transitions-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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