Weak localization, electron-electron interaction, and metal-insulator transition in ion-implanted polymers

Z. H. Wang, G. Du, J. Joo, A. Burns, S. Jasty, P. Zhou, A. J. Epstein, J. A. Osaheni, S. A. Jenekhe, C. S. Wang

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


Kr+ ion implanted rigid rod PBO, PBT and ladder BBL polymers show similar transport and optical behavior, with room temperature conductivities increasing from 10-12 S/cm to approximately 102 S/cm after implantation. A metal-insulator transition is observed at Tc to approximately 30 K. Above Tc, the results of a negative magnetoresistance (ΔR/R(H,T)), a weakly temperature dependent conductivity (σ(T)∝Tp, 0.5<p<1), a linearly T-dependent thermopower (S(T)), a Pauli spin susceptibility (χPauli), and a large microwave dielectric constant (εmw) resemble those of disordered metals in which weak localization and e-e interactions dominate the charge transport. Below Tc, the changed behavior of positive ΔR/R, stronger T-dependent σ, and 1/T-dependent S with a continued large and positive εmw all suggest an increased e-e interaction effect which opens up a `Coulomb' gap (approximately 2 meV), likely due to the enhanced localization. The density of states (DOS) is zero only at the center of the gap in accord with the theoretical prediction of the `Coulomb' gap.

Original languageEnglish
Pages (from-to)4829-4835
Number of pages7
JournalSynthetic Metals
Issue number2 -3 pt 6
Publication statusPublished - 1993 Jan 1
Externally publishedYes
EventProceedings of the International Conferece on Science and Technology of Synthetic Metals - Goteborg, Swed
Duration: 1992 Aug 121992 Aug 18

Bibliographical note

Funding Information:
ACKNOWLEDGEMENTS The authors thank S. L. Zhao for assistance, and S. Tibbets for implantation. This work was supported in part by US Air Force OSR Contract No. F49820-92-C0002.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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