Phonon-induced nonmetal-metal transition of a doped polyaniline

Jinsoo Joo, V. N. Prigodin, Y. G. Min, A. G. MacDiarmid, A. J. Epstein

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Abstract

We report the crossover for the microwave dielectric constant of camphor-sulfonic-acid-doped polyaniline prepared in m-cresol from very large room-temperature negative values to large positive ones with decreasing temperature below Ts∼20 K. We attribute this change to the transition from a phonon-controlled metallic state to a nonmetallic state with localized carriers and hopping transport below Ts. Electronically, one-dimensional chains that couple the three-dimensional crystalline regions are likely central for understanding the origin of this transition as weak localization. At T<Ts we also observed an increase in the thermoelectric power and a linear decrease in the reduced activation energy for dc conductivity.

Original languageEnglish
Pages (from-to)12226-12229
Number of pages4
JournalPhysical Review B
Volume50
Issue number16
DOIs
Publication statusPublished - 1994 Dec 1
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Joo, J., Prigodin, V. N., Min, Y. G., MacDiarmid, A. G., & Epstein, A. J. (1994). Phonon-induced nonmetal-metal transition of a doped polyaniline. Physical Review B, 50(16), 12226-12229. https://doi.org/10.1103/PhysRevB.50.12226