Thermal conductivity of the ferromagnetic chain system cesium trifluoronickelate (CsNiF3)

The thermal conductivity λ of CsNiF 3 has been measured in the region 2.5 K<T<10 K with the heat flow parallel to the chain direction. Fields up to 8 T were applied both within and perpendicular to the easy plane. The data on this ferromagnetic chain system indicate that the effect of solitons on λ is very small, in agreement with earlier observations on [C 6 H 11 NH 3 ]CuBr 3 (CHAB). This suggests that the soliton-phonon scattering in these systems is much smaller than in comparable antiferromagnetic systems, like tetramethylammonium manganese trichloride (TMMC)