Mössbauer study of the 57Fe hyperfine interactions in Nd(CO 0.95Fe0.05)5

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Abstract
The 57Fe hyperfine interactions in Nd(Co0.95Fe 0.05)5 have been measured at different temperatures between 4.2 K and 340 K by Mössbauer spectroscopy. Although an important modification of the spectra is associated with the magnetization reorientation, these are consistently interpreted at all temperatures. An analysis of the results shows that Fe atoms preferentially occupy the 3 g site of the CaCu5-type structure. This property, already observed in similar compounds, is interpreted in terms of steric considerations. The thermal variations of the hyperfine fields exhibit discontinuities associated with the magnetization reorientation. As in other systems, these are attributed to a discontinuity of the orbital contribution to the Fe moment It is deduced that the easy direction of magnetization for Fe moments on the different crystallographic sites is perpendicular to the c-axis of the hexagonal structure