Galvanomagnetic properties and electronic structure of iron-doped PbTe

Journal Article · Sat Nov 21 04:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4935822· OSTI ID:22492952

Kruleveckaya, O. V.; Skipetrova, L. A. ^[1]; Knotko, A. V. ^[2]; Slynko, E. I.; Slynko, V. E. ^[3]

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1. Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow 119991 (Russian Federation)
2. Faculty of Materials Science, M.V. Lomonosov Moscow State University, Moscow 119991 (Russian Federation)
3. Institute of Materials Science Problems, National Academy of Sciences of Ukraine, Chernivtsy 58001 (Ukraine)

We synthesize an iron-doped PbTe single-crystal ingot and investigate the phase composition and distribution of the iron impurity along the ingot as well as galvanomagnetic properties in weak magnetic fields (4.2 K ≤ T ≤ 300 K, B ≤ 0.07 T) of Pb{sub 1−y}Fe{sub y}Te alloys. We find microscopic inclusions enriched with iron and regions with a chemical composition close to FeTe in the heavily doped samples, while the iron impurity content in the main phase rises only slightly along the length of the ingot reaching the impurity solubility limit at approximately 0.6 mol. %. Samples from the initial and the middle parts of the ingot are characterized by p-type metal conductivity. An increase of the iron impurity content leads to a decrease in the free hole concentration and to a stabilization of galvanomagnetic parameters due to the pinning of the Fermi level by the iron resonant impurity level E{sub Fe} lying under the bottom of the valence band (E{sub v} − E{sub Fe} ≈ 16 meV). In the samples from the end of the ingot, a p-n inversion of the conductivity type and an increase of the free electron concentration along the ingot are revealed despite the impurity solubility limit being reached. The kinetics of changes of charge carrier concentration and of the Fermi energy along the ingot is analyzed in the framework of the six-band Dimmock dispersion relation. A model is proposed for the electronic structure rearrangement of Pb{sub 1−y}Fe{sub y}Te with doping, which may also be used for PbTe doped with other transition metals.

• OSTI ID: 22492952
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 19 Vol. 118; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABUNDANCE
ALLOYS
CHARGE CARRIERS
CHEMICAL COMPOSITION
DISPERSION RELATIONS
DISTRIBUTION
DOPED MATERIALS
ELECTRONIC STRUCTURE
FERMI LEVEL
HOLES
IMPURITIES
INCLUSIONS
IRON
IRON TELLURIDES
LEAD TELLURIDES
MAGNETIC FIELDS
MONOCRYSTALS
SOLUBILITY