Abstract
We have measured the paramagnetic susceptibility and the saturation magnetic moment of a number of polycrystalline samples of all four europium monochalcogenides. Many of them exhibit a negative susceptibility at 2 K and magnetic fields of 70 kOe, rather than the expected saturation behaviour. These anomalies are believed to be due to lattice defects. Reproducible saturation moments have been obtained after subtraction of this linear high field magnetization. Since all materials were nonstoichiometric to within a few percent, the ratio between the Curie-Weiss constantC and the saturation momentM 0 has been evaluated in order to eliminate the unreliably known numberN of the Eu+ + ions. The quantityR = g J (J+1) extracted in this way should have the valueR 0 = 9.00 forg = 2 andJ ≡S = 7/2. The measured values, 9.72, 9.33, 9.32 and 9.50 for EuO, EuS, EuSe and EuTe, respectively, can be correlated directly with the magnetic hyperfine fields, which are − 305, − 330, − 328 and − 315 kOe in the ferromagnetic aligned states. Both results together lead to the assumption that the magnetic moment per Eu-ion is enhanced over the8 S 7/2-value by spin contributions of outer 5d or 6s electrons.
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Köbler, U., Fischer, K.J. Effective magnetic moments of the europium-monochalcogenides. Z Physik B 20, 391–397 (1975). https://doi.org/10.1007/BF01313209
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DOI: https://doi.org/10.1007/BF01313209