Phonon-induced nonmetal-metal transition of a doped polyaniline

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

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66 Citations (Scopus)


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
Issue number16
Publication statusPublished - 1994
Externally publishedYes

Bibliographical note

Copyright 2015 Elsevier B.V., All rights reserved.

ASJC Scopus subject areas

  • Condensed Matter Physics


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