Fermi level pinning in Fe-doped PbTe under pressure

We synthesize an iron-doped PbTe single-crystal ingot and investigate the phase and the elemental composition as well as galvanomagnetic properties in weak magnetic fields (4.2 K≤T≤300 K, B ≤ 0.07 T) of Pb1−yFeyTe alloys upon varying the iron content, at atmospheric pressure and under hydrostatic co...

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Veröffentlicht in:Applied physics letters 2014-07, Vol.105 (2)
Hauptverfasser: Skipetrov, E. P., Kruleveckaya, O. V., Skipetrova, L. A., Slynko, E. I., Slynko, V. E.
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container_issue 2
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container_title Applied physics letters
container_volume 105
creator Skipetrov, E. P.
Kruleveckaya, O. V.
Skipetrova, L. A.
Slynko, E. I.
Slynko, V. E.
description We synthesize an iron-doped PbTe single-crystal ingot and investigate the phase and the elemental composition as well as galvanomagnetic properties in weak magnetic fields (4.2 K≤T≤300 K, B ≤ 0.07 T) of Pb1−yFeyTe alloys upon varying the iron content, at atmospheric pressure and under hydrostatic compression up to 10 kilobars. We find an increase of iron concentration along the length of the ingot and the appearance of microscopic inclusions enriched with iron in the heavily doped samples. Lightly doped alloys are characterized by the p-type metal conductivity. An increase of the iron impurity content leads to a decrease in the free hole concentration, a stabilization of galvanomagnetic parameters, indicating the pinning of the Fermi energy by the iron resonant impurity level lying under the bottom of the valence band, and to the p-n inversion of the conductivity type. Under pressure, the free hole concentration in the sample, in which the stabilization of galvanomagnetic parameters takes place, increases by approximately a factor of four due to the flow of electrons from the valence band to the iron-induced resonant level. Using the two-band Kane and the six-band Dimmock dispersion relations, the pressure dependence of the Fermi energy is calculated. The model of the electronic structure rearrangement of Pb1−yFeyTe under pressure is proposed. The energy position and the pressure coefficient of the resonant iron impurity level are determined.
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An increase of the iron impurity content leads to a decrease in the free hole concentration, a stabilization of galvanomagnetic parameters, indicating the pinning of the Fermi energy by the iron resonant impurity level lying under the bottom of the valence band, and to the p-n inversion of the conductivity type. Under pressure, the free hole concentration in the sample, in which the stabilization of galvanomagnetic parameters takes place, increases by approximately a factor of four due to the flow of electrons from the valence band to the iron-induced resonant level. Using the two-band Kane and the six-band Dimmock dispersion relations, the pressure dependence of the Fermi energy is calculated. The model of the electronic structure rearrangement of Pb1−yFeyTe under pressure is proposed. 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E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Fermi level pinning in Fe-doped PbTe under pressure</atitle><jtitle>Applied physics letters</jtitle><date>2014-07-14</date><risdate>2014</risdate><volume>105</volume><issue>2</issue><issn>0003-6951</issn><eissn>1077-3118</eissn><abstract>We synthesize an iron-doped PbTe single-crystal ingot and investigate the phase and the elemental composition as well as galvanomagnetic properties in weak magnetic fields (4.2 K≤T≤300 K, B ≤ 0.07 T) of Pb1−yFeyTe alloys upon varying the iron content, at atmospheric pressure and under hydrostatic compression up to 10 kilobars. We find an increase of iron concentration along the length of the ingot and the appearance of microscopic inclusions enriched with iron in the heavily doped samples. Lightly doped alloys are characterized by the p-type metal conductivity. An increase of the iron impurity content leads to a decrease in the free hole concentration, a stabilization of galvanomagnetic parameters, indicating the pinning of the Fermi energy by the iron resonant impurity level lying under the bottom of the valence band, and to the p-n inversion of the conductivity type. Under pressure, the free hole concentration in the sample, in which the stabilization of galvanomagnetic parameters takes place, increases by approximately a factor of four due to the flow of electrons from the valence band to the iron-induced resonant level. Using the two-band Kane and the six-band Dimmock dispersion relations, the pressure dependence of the Fermi energy is calculated. The model of the electronic structure rearrangement of Pb1−yFeyTe under pressure is proposed. The energy position and the pressure coefficient of the resonant iron impurity level are determined.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4890381</doi></addata></record>
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source AIP Journals Complete; Alma/SFX Local Collection
subjects ALLOYS
Applied physics
CONCENTRATION RATIO
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DISPERSION RELATIONS
DOPED MATERIALS
Electromagnetism
ELECTRONIC STRUCTURE
ELECTRONS
FERMI LEVEL
Hydrostatic compression
IMPURITIES
Ingots
Intermetallic compounds
Iron
IRON ADDITIONS
LEAD TELLURIDES
MAGNETIC FIELDS
Magnetic properties
MONOCRYSTALS
Parameters
Pinning
PRESSURE DEPENDENCE
Single crystals
STABILIZATION
Valence band
VISIBLE RADIATION
title Fermi level pinning in Fe-doped PbTe under pressure
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