The electron structure of Pb1-x-ySnxFeyTe alloysстатья
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Дата последнего поиска статьи во внешних источниках: 6 марта 2019 г.
Аннотация:A study of phase and elemental compositions, galvanomagnetic properties (4.2 K≤T≤300 K, B≤0.07 T) and Shubnikov–de Haas oscillations (T=4.2 K, B≤6.5 T) in Pb1–x–ySnxFeyTe alloys with varying concentrations of tin and iron in single-crystal ingots synthesized using the Bridgman-Stockbarger method was performed. Scanning electron microscopy and X-ray fluorescence microanalysis revealed the presence of iron enriched microscopic inclusions, and the distribution of tin and iron along the ingots was determined. An increase in the concentration of holes with increasing concentrations of tin and iron, as well as anomalous temperature dependences of the Hall coefficient, which indicates a pinning of the Fermi level at the resonant level of iron, were detected. A model of electron structure rearrangement is proposed in order to explain the experimental dependences of the hole concentration and the Fermi energy relative to the valence band top as a function of tin concentration in the alloys. The model assumes that the iron level moves from the top to the depth of the valence band as the tin concentration increases. The compositional coefficient of iron level movement relative to the edges of the energy bands with increasing tin content in Pb1–x–ySnxFeyTe alloys is determined using the two-band Kane dispersion law.