Abstract
Magnetic properties in the paramagnetic phase of pseudo-one-dimensional system RbFeCl 3 are studied within a linear chain model on the basis of the Dynamical CEFA (Correlated-Effective-Field Approximation). The results of calculation, the magnetic susceptibility, the temperature and magnetic-field dependences of the magnon energy and the magnon dispersion, can well explain the experimental results. The gap energy D between the ground state and the excited doublet of the Fe 2+ ion is conclusively estimated to be \(\gtrsim\)14.0 cm -1 . The possibility of two-magnon Raman scattering is also predicted and the temperature dependences of the Raman line shape and the integrated intensity are calculated.
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