Temperature Coefficient of Movement of the Resonance Level of Iron in Pb{sub 1 – x} {sub – y}Sn{sub x}Fe{sub y}Te Alloys

Journal Article · Fri Nov 15 04:00:00 EST 2019 · Semiconductors

DOI:https://doi.org/10.1134/S1063782619110186· OSTI ID:22944771

Kovalev, B. B.; Skipetrova, L. A. ^[1]; Knotko, A. V. ^[2]; Slynko, V. E. ^[3]

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1. Faculty of Physics, Moscow State University (Russian Federation)
2. Faculty of Materials Science, Moscow State University (Russian Federation)
3. Institute of Materials Science Problems, National Academy of Sciences of Ukraine (Ukraine)

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 Pb{sub 1 – x– y}Sn{sub x}Fe{sub y}Te 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.

• OSTI ID: 22944771
• Journal Information: Semiconductors, Journal Name: Semiconductors Journal Issue: 11 Vol. 53; ISSN SMICES; ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONCENTRATION RATIO
ELECTRONIC STRUCTURE
FERMI LEVEL
HALL EFFECT
IMPURITIES
IRON
LEAD ALLOYS
MAGNETIC FIELDS
MATRIX MATERIALS
MONOCRYSTALS
STOCKBARGER METHOD
TEMPERATURE COEFFICIENT
TEMPERATURE DEPENDENCE
TIN
TRANSFORMATIONS
VALENCE