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VOLUME 85 | ISSUE 12 | PAGE 774
On the ac magnetic susceptibility of spin-chains: solitons in one-dimensional systems
S. A. Pikin, Z. Tomkowicz+, E. S. Pikina*, W. Haase^\nabla
Shubnikov' Institute of Crystallography RAS, 119333 Moscow, Russia
+Institute of Physics, Jagiellonian University, 30-059 Krakow, Poland
*Institute for Problems of Oil and Gas RAS, 119333 Moscow, Russia
^\nablaInstitut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany

PACS: 75.10.Pq, 75.30.Cr
It is shown that relatively simple phenomenological considerations of the motion of thermally activated solitons (kinks of various types) in the single spin chains can explain and describe qualitatively and quantitatively the temperature and frequency behaviour of magnetic susceptibility in ac magnetic fields. The comparison of experimental data and theoretical results allows estimate the number of solitons and ``weak" places in correlation regions of a sample.

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