Abstract
The spin dynamics of the one-dimensional (1D) magnet ${\mathrm{Na}}_{2}{\mathrm{MnF}}_{5}$ have been investigated by inelastic neutron scattering. Measurements of the spin-wave dispersion resulted in values of the exchange constant ${J/k}_{B}=\ensuremath{-}8.5(1)\mathrm{K}$ and the anisotropy constant ${D/k}_{B}=\ensuremath{-}2.70(2)\mathrm{K},$ respectively. The temperature dependence of the magnetic correlation length showed significant deviations from the Heisenberg/ Fischer behavior at low temperatures. The observed exponential increase of the inverse correlation length upon temperature is a typical feature of strongly anisotropic systems. Soliton excitations have been measured directly by high-resolution neutron spectroscopy. From these measurements, a soliton activation energy of ${E}_{s}{/k}_{B}=65(5)\mathrm{K}$ has been determined. The results are discussed with respect to other 1D magnetic systems among the fluoromanganates.
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