Magnetic susceptibility due to disorder-induced neutral solitons in interacting polymer chains

Article

关键词: ELECTRON-SPIN-RESONANCE;    CONJUGATED POLYMERS;    DURHAM POLYACETYLENE;    OPTICAL-ABSORPTION;    PEIERLS;    MODEL;    SPECTROSCOPY;    HUBBARD;    DENSITY;    LATTICE;   

DOI  :  10.1103/PhysRevB.59.13882

来源: SCIE

【 摘 要 】

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 transpolyacetylene and we suggest experiments extending towards lower temperatures. [S0163-1829(99)02721-6].

【 授权许可】

Free