Anomalous temperature dependence of the magnetic hyperfine field of99Ru in gadolinium |
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Authors: | M Forker S Scholz L Freise |
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Institution: | (1) Institut für Strahlen- und Kernphysik der Universität Bonn, 5300 Bonn, Federal Republic of Germany |
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Abstract: | The magnetic hyperfine field at dilute99Ru impurities in ferromagnetic Gd has been investigated as a function of temperature by time differential perturbed angular correlation (TDPAC) measurements. The saturation field at 11 K is Hhf(Ru Gd)=51(2) KOe. This value fits well into the systematics of 4d impurity hyperfine fields in Gd. The magnetic hyperfine field of RuGd does not follow the magnetization of the host (Tc=290 K) but vanishes abruptly at about 70 K. A similar behaviour has previously been observed for the 5d impurity Os in Gd. From first TDPAC measurements of the hyperfine interactions in the intermetallic phases of the Ru-Sc system it can not be completely ruled out that the observed collapse of the hyperfine field at 70 K is due to the formation of the intermetallic compound RuGd3.This work has been supported by the Minister für Wissenschaft und Forschung des Landes Nordrhein-Westfalen |
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