Abstract
The electron paramagnetic resonance (EPR) spectra and the stationary magnetic susceptibility are investigated for Ca1–x Eu x S and Sr1–x Eu x S solid solutions (0.00005 < x < 0.0032). The EPR spectrum of Eu2+ in both matrices contains a wide structureless line in addition to the narrow lines of the superfine structure characteristic of ions with high local symmetry. Because of the extraordinary temperature dependence of this line in CaS:Eu, it is associated with strongly interacting magnetic centers, namely, exchange-coupling pairs and chains or more complex clusters of magnetic ions. At the same time, the dependence of the stationary magnetic susceptibility in the temperature range 4.2–50 K has no peculiarities for CaS:Eu and SrS:Eu and obeys the Curie law.
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Danilkin, M.I., Klimonskii, S.O., Koksharov, Y.A. et al. Extraordinary Magnetic Properties of Ca1–xEuxS and Sr1–xEuxS Solid Solutions. Russian Physics Journal 43, 670–674 (2000). https://doi.org/10.1023/A:1026643221197
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DOI: https://doi.org/10.1023/A:1026643221197