DEFECT CONCENTRATION DEPENDENT PHASE-TRANSITION IN THE ORGANIC QUASI-ONE-DIMENSIONAL CONDUCTOR N-PROPYL-QUINOLINIUM(TCNQ)2

Anomalous changes in magnetic and electrical properties indicative of a phase transition at T c ∼ 220 K is found in the quasi one dimensional complex charge transfer salt N-propyl-quinolinium (TCNQ) 2 . A series of samples with defects induced by neutron irradiation is investigated. The physical properties above 220 K are little affected by the radiation damage, however the temperature of the anomaly is shifted to lower temperatures. A dose which is estimated to damage of the order of 1 % of the molecules lowers T c from 220 K to 150 K. © 1979.