Abstract
Neutron diffraction and M\ossbauer spectroscopy have been used to examine the connections between long- and short-range magnetic order in the rare-earth iron ferroborate YFe${}_{3}$(BO${}_{3}$)${}_{4}$. We establish the presence of short-range magnetic order in the pseudo-one-dimensional Fe-spin chains of the FeO${}_{6}$ octahedra while the ferroborates are in their (long-range) paramagnetic phase. The short-range order exists at temperatures several times the N\'eel temperature. In addition, we observe thermal hysteresis of the short-range ordered Fe spins. The observed Fe-spin dynamics are suggestive of the presence of solitons within the domains that form in the Fe-spin chains.
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