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- Metal-insulator transitions in pressed pellets of BF4 - doped poly(3-methylthiophene)
- Universidade de São Paulo (USP)
- Universidade Federal de São Carlos (UFSCar)
- Universidade Estadual Paulista (UNESP)
- 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.
- Phase Transitions, v. 62, n. 3 SEC. A, p. 157-165, 1997.
- 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
- Acesso restrito
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