Abstract
The Mossbauer spectroscopy is applied to the perovskite compound, RbFeF 3 , in the phase which is realized between T 1 (39 K) and T 2 (87 K). The Mossbauer spectra clearly indicate the existence of two kinds of Fe 2+ sites. We label one of the sites as the site I and the other as the site II. From the Mossbauer spectra observed for a stress-free single crystal sample in an applied magnetic field, it is concluded that the spontaneous magnetization along a pseudo-cubic [100] axis originates in a ferrimagnetic spin arrangement; the magnetic moment of an Fe 2+ ion at the site II is larger than that at the site I. It is also concluded that the spin easy axis coincides with a pseudo-cubic [100] axis along which the lattice constant is the smallest. From the Mossbauer parameters determined, the electronic state of an Fe 2+ ion is inferred.
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