Abstract
The combined magnetic and electric hyperfine interaction at the site of a111Cd impurity in magnetically ordered Dysprosium has been investigated as a function of temperature by time differential perturbed angular correlation measurements. Three different phases have been found in metallic Dy with transition temperatures of 85 and 179 °K in agreement with the results of bulk material measurements. In the paramagnetic phase above 179 °K a pure electric quadrupole interaction has been observed. The various contributions to the electric fieldgradient are analyzed and it is shown, that the dominant contribution comes from the conduction electrons.
In the ferromagnetic phase which extends from 0 to 85 °K the magnetic hyperfine field at the site of111Cd has the same temperature dependence as the spontaneous magnetization. The value of the hyperfine field at 4.2 °K is ¦H eff¦=(221 ± 4) kG. At 85 °K a transition to the antiferromagnetic phase of Dy occurs, which shows a hysteresis of the transition temperature. In the antiferromagnetic phase the temperature dependence of the hyperfine field deviates considerably from the magnetization curve. It is suggested that this deviation might be due to a temperature dependence of thes-f exchange interaction.
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The authors are indebted to Prof. Bodenstedt for his kind interest and support of this work. The help of Mr. Netz in preparing the sources is very much appreciated. The generous financial support by the Bundesministerium für Bildung und Wissenschaft is gratefully acknowledged. The numerical calculations have been performed on the IBM 370 computer of the Gesellschaft für Mathematik und Datenverarbeitung Bonn.
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Forker, M., Hammesfahr, A. Study of combined magnetic and electric hyperfine interactions for cadmium in Dysprosium by time differential perturbed angular correlations. Z. Physik 260, 131–146 (1973). https://doi.org/10.1007/BF01448973
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DOI: https://doi.org/10.1007/BF01448973