Abstract
Abstract It has been shown in earlier magnetic resonance studies that highly mobile spins, consistently described in terms of neutral magnetic solitons, are present in trans-(CH)1−3 x. Furthermore the effect of oxygen contamination, in particular on the spin dynamics, has been noticed. It basically consists in a broadening of the ESR line, which has been interpreted as resulting from a trapping effect of solitons by oxygen. Adsorbed oxygen at the (CH)x fibril surface create traps for solitons on the neighbouring chains. The trapped soliton concentration is determined as the thermal population of solitons intraps. It depends on both temperature and trap concentration. Increasing the trapped soliton concentration by increasing the number of traps - in particular by oxygen contamination - and/or by decreasing temperature results in decreasing the average number of mobile spins. Consequently the motional narrowing of the ESR line is decreased, and a broadening is observed. The resulting line-width can be expr...
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