Effect of scandium doping and of matrix composition variation on galvanomagnetic properties and electronic structure of Pb1-x-ySnxScyTe alloys

Skipetrov, E. P.; Khvorostin, A.V.; Knotko, A.V.; Слынько, В. И.

doi:10.1016/j.materresbull.2020.111002

Cited by 4 publications

(3 citation statements)

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“…The initial compounds were synthesized in advance from high-purity components (Pb -99.9999%, Sc -99.9%, Te -99.9997%). The method of preparation of the initial components and synthesis of single crystals was discussed in detail in [10,11,14]. The ingot was cut perpendicularly to the growth axis, which was aligned with crystallographic direction 111 to within several angular degrees, by string cutting into 28 disks ∼ 1.5 mm in thickness.…”

Section: Samples and Experimental Proceduresmentioning

confidence: 99%

“…It is known that the resonance impurity scandium level (E Sc ) in Pb 1−x −y Sn x Sc y Te (x = 0−0.045) alloys is positioned high within the conduction band, much higher than the Fermi level in undoped samples (E Sc ≈ E c + 280 meV at T = 4.2 K) [10,11]. Therefore, when the donor Sc impurity concentration increases in the course of doping, the processes of self-ionization of impurity ions (Sc 2+ → Sc 3+ + e band ) induce filling of the unoccupied states below the scandium level (first in the valence band, then in the conduction band), p−n conductivity type inversion, and a monotonic increase in the electron density from 10 16 to almost 10 20 cm −3 .…”

Section: Introductionmentioning

confidence: 99%

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Magnetic properties of Pb-=SUB=-1-y-=/SUB=-Sc-=SUB=-y-=/SUB=-Te alloys

et al. 2022

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The magnetic field dependences of the magnetization (B≤9 T, T=2-70 K) of the samples from a single crystal Pb1-yScyTe (y=0.01) ingot, synthesized by the Bridgman method, are studied. It is established that, in accordance with the generally accepted model of the rearrangement of the electronic structure of alloys during doping, there is no paramagnetic contribution of single scandium ions located in the nodes of the metal sublattice in the studied samples. The magnetization of the samples contains several contributions: superparamagnetism of scandium clusters, linear in field diamagnetism of the crystal lattice and the paramagnetism of free electrons, as well as the oscillating contribution of the de Haas--van Alphen effect. The field dependences of the main contribution of scandium clusters are successfully approximated using the Langevin function. The average concentration, magnetic moment and the total magnetic moment of the clusters per unit volume of the sample were determined with an increase in the impurity concentration along the ingot. Keywords: PbTe-based alloys, 3d-transition metal impurities, rearrangement of electronic structure, field dependences of magnetization, superparamagnetism of scandium clusters.

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Section: Samples and Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic properties of Pb-=SUB=-1-y-=/SUB=-Sc-=SUB=-y-=/SUB=-Te alloys

et al. 2022

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“…В сплавах, легированных скандием, примесные ионы Sc 2+ (3d 1 ) должны обладать минимальными спиновым (S = 1/2) и соответственно магнитным моментами, а в состоянии Sc 3+ (3d 0 ) быть магнитонейтральными. Известно, что в сплавах Pb 1−x −y Sn x Sc y Te (x = 0−0.045) резонансный примесный уровень скандия E Sc находится высоко в зоне проводимости, гораздо выше уровня Ферми в нелегированных образцах (E Sc ≈ E c + 280 мэВ при T = 4.2 К) [10,11]. Поэтому при легировании, с ростом концентрации донорной примеси Sc, в результате процессов самоионизации ионов при-меси (Sc 2+ → Sc 3+ + e band ) происходит заполнение пустых состояний под уровнем скандия (сначала в валентной зоне, а затем и в зоне проводимости), p−n-инверсия типа проводимости и монотонное увеличение концентрации электронов от 10 16 почти до 10 20 см −3 .…”

Section: Introductionunclassified

Магнитные свойства сплавов Pb-=SUB=-1-y-=/SUB=-Sс-=SUB=-y-=/SUB=-Te

Skipetrov¹,

Богданов²,

Skipetrova³

et al. 2021

Физика И Техника Полупроводников

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The magnetic field dependences of the magnetization (B < 9 Т, T = 2.0 - 70 K) of the samples from a single crystal Pb1-yScyTe (y=0.01) ingot, synthesized by the Bridgman method, are studied. It is established that, in accordance with the generally accepted model of the rearrangement of the electronic structure of alloys during doping, there is no paramagnetic contribution of single scandium ions located in the nodes of the metal sublattice in the studied samples. The magnetization of the samples contains several contributions: superparamagnetism of scandium clusters, linear in field diamagnetism of the crystal lattice and the paramagnetism of free electrons, as well as the oscillating contribution of the de Haas – van Alphen effect. The field dependences of the main contribution of scandium clusters are successfully approximated using the Langevin function. The average concentration, magnetic moment and the total magnetic moment of the clusters per unit volume of the sample were determined with an increase in the impurity concentration along the ingot.

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