Abstract
The hyperfine interaction of dilute57Fe in the rare earth (RE)metals Gd to Lu was investigated by Mossbauer measurements with57Co doped RE sources. In all hosts well split, 2-lines spectra were observed at room temperature, with slight asymmetries of the line intensities in some cases. The quadrupole splitting eQVzz/2 increases from 0.29 mm/sec for Gd to 0.50 mm/sec for Tb, and decreases by less than 10 % between Tb and Lu. Only about 10 % of the corresponding electric fieldgradient (EFG) can be accounted for by the ionic EFG on a substitutional RE site. The temperature dependence of the EFG was measured in the case of Tb. No variation within 3 percent was found between 300 K and 700 K. Measurements of the magnetic hyperfine interaction at low temperatures were carried out in Tb. The saturation field of57Fe in this host is Hhf(FeTb;4.2 K)=25(2) KOe. The temperature dependence of the magnetic hyperfine field does not follow the host magnetization (Tc=220K) but vanishes at about 80 K. Similar anomalies of Hhf(T) have previously been observed for other transition element impurities in the RE ferromagnets.
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