Magnetic hyperfine interaction in KFeCl3a compound with one-dimensional spin correlations

Neutron-diffraction measurements revealed in KFe${\mathrm{Cl}}_3$ one-dimensional spin correlations, in the temperature range $T_N\le T\le 2T_N$. Mössbauer-effect measurements at some of these temperatures show a distinct hyperfine magnetic splitting. The spectra exhibit a typical relaxation character which can be explained by one-dimensional spin correlations and the anisotropic magnetic exchange interaction. The spectra that exhibit relaxation phenomena were analyzed by two stochastic models.