Magnetic properties of diluted magnetic semiconductors Pb1-yFeyTeстатья
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Дата последнего поиска статьи во внешних источниках: 12 июля 2017 г.
Аннотация:The phase and elemental composition and magnetic properties (B<7.5 T, 2.0K<T<70 K) of
Pb1–yFeyTe alloys were studied under varied impurity concentration along the Bridgman-grown
single-crystal ingot. The distribution of iron impurity along the length of the ingot in the main
phase and the composition of microscopic inclusions of the second phase were determined. It was
established that the magnetization of the samples contains several contributions: the paramagnetic
contribution of impurity ions, crystal lattice diamagnetism, as well as the contributions of free
charge carriers, charge carriers in the impurity band, clusters of iron ions, and the oscillating contribution of the de Haas–van Alphen effect. These contributions were systematically separated. Using
an approximation for the magnetic field and temperature dependences of the impurity-ion contribution
by a sum of two terms based on the modified Brillouin functions, we determined the variation
of the concentration of iron ions in two different charge states along the ingot. It was shown that
the charge carrier concentrations obtained from the de Haas–van Alphen oscillations are in satisfactory
agreement with the Hall concentrations, indicating a weak effect of the inclusions of the second
phase and magnetic clusters on homogeneity and physical properties of the main phase in
Pb1–yFeyTe alloys.