HIGH FIELD STUDY OF HYPERFINE INTERACTIONS AND COVALENCY EFFECTS IN EUROPIUM-MONOCHALCOGENIDES

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Abstract
The hyperfine fields and isomer shifts of the 21.6 keV transition of 151Eu have been studied in external magnetic fields up to 13 T in the ferromagnetic saturated state of the Europiummonochalcogenides. For the antiferromagnetic phase of EuTe the h. f. field is - 25.6 T and differs by - 5.0 T from the h. f. field in the ferromagnetic phase due to the transferred field contributions of the Eu-neighbours. The h. f. fields, BI, in the ferromagnetic state should be compared with the value of R = g(S + 1) which is derived from the EU2+ magnetic moment, µ = gµB S, as determined by magnetization measurements. The values measured in EuO, EuS, EuSe, and EuTe are BI = - 30.5, - 33.0, - 32.8, - 30.6 T, and R = 9.72, 9.32, 9.28, 9.69, respectively. For a pure 4f7-8S7/2 configuration of the Eu2+-ion the values of BI and R are expected to be - 34.2 T and 9.0. The deviations are probably caused by orbital admixtures which are assumed to Vary between EuO and EuTe in relation to the location of the 4f-level within the energy bands

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