SPIN-GLASS PROPERTIES OF (Eu, Sr) S

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Abstract
Insulating compounds of the magnetic dilution series EuxSr1-xS reveal spin glass behavior for 0,13 ≤≈ x ≤≈ 0,65, similar to that in metallic alloys. We discuss some of the experimental properties characterizing both the spin-glass state and the nature of the transition. A microscopic picture of the "frozen" state is presented based on the competition of ferromagnetic nearest neighbor and antiferromagnetic next nearest-neighbor exchange. It is supported by the observed magnetic ordering of EuxSr1-xS over the whole concentration range 0 < x ≤ 1, i.e. with the change to superparamagnetism for x < 0,13 and the topology of the magnetic phase diagram near the onset of ferromagnetism at xc = 0.51

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