Abstract
We have studied the temperature dependence of the intrinsic coercivity of the compounds RMnSi 2 (R La, Ce, Pr, Nd) from 4.2 to 300 K. The differences in coercivity behaviour observed for these compounds were correlated with the corresponding temperature behaviour of the magnetic structures and with the valence instability of Ce in CeMnSi 2. Magnetic isotherms of LaMnSi 2 and CeMnSi 2 at 4.2 K were studied in field strengths up to 35 T. Neutron diffraction measurements were performed on CeMnSi 2 at 8 and 408 K. From the results of neutron diffraction and high field measurements it was concluded that Ce loses its magnetic moment at low temperatures. This is the first example of a strongly ferromagnetic compound in which Ce has an unstable valence.
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