skip to main content

SciTech ConnectSciTech Connect

Title: Galvanomagnetic properties and electronic structure of iron-doped PbTe

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 ofmore » 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.« less
Authors:
 [1] ;  [2] ; ;  [1] ;  [3] ;  [2] ; ;  [4]
  1. Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow 119991 (Russian Federation)
  2. (Russian Federation)
  3. Faculty of Materials Science, M.V. Lomonosov Moscow State University, Moscow 119991 (Russian Federation)
  4. Institute of Materials Science Problems, National Academy of Sciences of Ukraine, Chernivtsy 58001 (Ukraine)
Publication Date:
OSTI Identifier:
22492952
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 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