CONDUCTING POLYMERS AT LOW-TEMPERATURES AND HIGH MAGNETIC-FIELDS

Advances in the synthesis of organic conducting polymer systems has in creased the electrical conductivity of these systems by several orders of magnitude in the last decade. Several practical applications are e nvisioned for such systems, but a thorough understanding of the conduc tion mechanisms and identification of the charge carriers is lacking, making design and implementation for bulk synthesis difficult. In orde r to clarify our understanding of the electrical properties of these s ystems, the resistivity and magnetoresistivity of various polymers dop ed near the metal - insulator transition, such as polyaniline protonat ed by camphor sulfonic acid (PANi-CSA) and polypyrrole doped with PF6 (PPy-PF6), have been studied down to 25 mK in magnetic fields up to 16 T.