GRANULAR SUPERCONDUCTIVITY IN A CONDUCTING POLYMER-FULLERENE-ALKALI METAL COMPOSITE

摘要

A superconducting (SC) phase is found in poly(3-alkylthiophene)-(C-60)(y)-K-x composites by both low field microwave absorption (LFMA) and SQUID magnetometry. T-C varies from 12 to 17 K depending on y and x: T-C(y = 0.05)= 17 K, at optimal x. LFMA shows phase reversal just below T-C in composites with y > 0.025 indicating the granular SC phase of disordered K3C60 clusters. The possibility of a two-component SC phase in which the electrons of conducting polymer chains are actively involved in SC pairing induced via hybridization with C-60 molecules is discussed for the case y < 0.005. [References: 52]