Magnetic Susceptibility Due to Disorder-Induced Neutral Solitons in Interacting Polymer Chains

Details Magnetic Susceptibility Due to Disorder-Induced Neutral Solitons in Interacting Polymer Chains Magnetic Susceptibility Due to Disorder-Induced Neutral Solitons in Interacting Polymer Chains

1999-03-08

arxiv.org/abs/cond-mat/9903133v1

Physics

Condensed Matter

Soft Condensed Matter

23 pages, 5 Postscript figures included; to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.59.13882

We study the magnetic response due to neutral solitons induced by disorder in polymer materials. We account for interchain interactions, which, if sufficiently strong, result in a bond-ordered phase, in which the neutral solitons are bound into pairs. We analytically calculate the corresponding pair size distribution. As the spins of the solitons have a distance dependent antiferromagnetic coupling, this allows us to calculate the magnetic susceptibility in the ordered phase. At low temperatures, the result deviates from the usual Curie behavior in a way that depends on the relative strength of the disorder and the interchain interactions. We compare our results to the observed magnetic susceptibility of trans-polyacetylene and we suggest new experiments extending towards lower temperatures.

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