Impurity-induced magnetism in Pb1-x-yGexYbyTeстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 16 ноября 2012 г.
Аннотация:We have studied the magnetic susceptibility and magnetization of the diluted magnetic semiconductor Pb1-x-yGexYbyTe. The susceptibility measured is a superposition of the matrix diamagnetism, the paramagnetic contribution of electrons localized in the ytterbium-band, and the Curie-Weiss paramagnetism provided by Yb3+ ions. The concentration of Yb3+ ions increases monotonically with the ytterbium content, while a significant fraction of ytterbium ions remains in a nonmagnetic Yb2+ state. This is explained within the electronic band-structure model, assuming the ytterbium-derived donor states form an impurity band in the vicinity of the valence-band top. In terms of this model the Yb3+ concentration and electronic population of the impurity band are determined as a function of the alloy composition.