SPIN-GLASS PROPERTIES OF (Eu, Sr) S
نویسنده
چکیده
Insulating compounds of the magnetic dilution series Eu Sr, S reveal spin glass behavior for 0.13^ x £ 0.65, similar to that in metallic alloy's*. :-7e 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 Eu Sr, S over the whole concentration range o< 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 x =0.51. c
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