Ferromagnetism in diluted Pb1-x-yGexCryTe magnetic semiconductorsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Magnetic properties of Pb1–x–yGexCryTe alloys (x=0.02–0.20, y=0.01–0.08) were studied. It was detected that the magnetic susceptibility of alloys consists of two contributions: the paramagnetic Curie–Weiss part (the temperature region is T<50 K) caused, probably, by the Cr3+ ion paramagnetism, and the high-temperature ferromagnetic part (T<300 K). The dependences of the concentration of magnetic centers on the composition of the matrix were obtained from the paramagnetic and ferromagnetic contributions. It was shown that decrease in the concentration of paramagnetic centers can be, at least qualitatively, explained by the transformation of the electronic structure as the germanium concentration increases. A phenomenological model was suggested, which explains the behavior of magnetic properties as the chromium content increases, and possible mechanisms of ferromagnetic ordering in studied alloys are discussed.