Temperature Coefficient of Movement of the Resonance Level of Iron in Pb1 – x – ySnxFeyTe Alloys
- Authors: Skipetrov E.P.1,2, Kovalev B.B.1, Skipetrova L.A.1, Knotko A.V.2, Slynko V.E.3
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Affiliations:
- Faculty of Physics, Moscow State University
- Faculty of Materials Science, Moscow State University
- Institute of Materials Science Problems, National Academy of Sciences of Ukraine
- Issue: Vol 53, No 11 (2019)
- Pages: 1419-1426
- Section: Electronic Properties of Semiconductors
- URL: https://journals.rcsi.science/1063-7826/article/view/207258
- DOI: https://doi.org/10.1134/S1063782619110186
- ID: 207258
Cite item
Abstract
The phase and elemental composition and the temperature dependences of the resistivity and Hall coefficient (temperature range 4.2 K ≤ T ≤ 300 K, magnetic fields B ≤ 0.07 T) are studied in Pb1 – x– ySnxFeyTe alloys with varying matrix composition and iron-impurity concentration along single-crystal ingots synthesized by the Bridgman–Stockbarger method. The distributions of tin and iron along ingots are obtained. Anomalous temperature dependences of the Hall coefficient related to the Fermi-level pinning by the resonance level of iron located in the valence band of the alloys are found. The experimental results are analyzed within the model of transformation of the electronic structure, involving iron level movement with respect to the top of the valence band with increasing tin concentration and temperature. The temperature coefficient of the iron level movement with respect to the midgap is determined. Possible diagrams of transformation of the electronic structure with increasing temperature in alloys with the normal spectrum (0.06 ≤ x ≤ 0.35) are proposed.
About the authors
E. P. Skipetrov
Faculty of Physics, Moscow State University; Faculty of Materials Science, Moscow State University
Author for correspondence.
Email: skip@mig.phys.msu.ru
Russian Federation, Moscow, 119991; Moscow, 119991
B. B. Kovalev
Faculty of Physics, Moscow State University
Email: skip@mig.phys.msu.ru
Russian Federation, Moscow, 119991
L. A. Skipetrova
Faculty of Physics, Moscow State University
Email: skip@mig.phys.msu.ru
Russian Federation, Moscow, 119991
A. V. Knotko
Faculty of Materials Science, Moscow State University
Email: skip@mig.phys.msu.ru
Russian Federation, Moscow, 119991
V. E. Slynko
Institute of Materials Science Problems, National Academy of Sciences of Ukraine
Email: skip@mig.phys.msu.ru
Ukraine, Chernivtsy, 58001