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1
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Concentration Anomalies of Properties in Pb_{1-x}Ge_{x}Te Solid Solutions

100%
Rogacheva E., Sinelnik N., Nashchekina O.
Acta Physica Polonica A
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1993
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vol. 84
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issue 4
729-732
EN
The investigation of electrical conductivity, coefficient of thermal electromotive force, Hall coefficient, microhardness and mobility in Pb_{1-x}Ge_{x}Te (x = 0 ÷ 0.1) alloys in the temperature range of 77-300 K was carried out. Anomalies were detected in isotherms of properties in the vicinity of x = 0.008. The anomalies were treated as a manifestation of concentration phase transitions occurring in solid solutions of any kind and associated with existence of critical concentration (percolation threshold) at which the uninterrupted chain of interactions between impurity atoms is formed.
2
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Anomalous Galvanomagnetic Effects in InSb Thin Films with Superconducting Lead Inclusions

100%
Mironov O., Nashchekina O., Oszwaldowski M., Berus T.
Acta Physica Polonica A
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1993
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vol. 83
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issue 2
227-230
EN
We report on the first experimental observations of an anomalous increase in the resistance of a semiconductor-super conductor contact in the vicinity of the critical temperature T_{c}. The effect is found in lead-doped InSb thin films having inclusions of lead of 1-3 μm in diameter: The observed effect can be a model that explains similar resistance increase observed sometimes in the high T_{c} superconductors.
3
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Defects of Non-Stoichiometry and Dynamic Stability of SnTe Crystal Lattice

88%
Rogacheva E., Sinelnik N., Nashchekina O., Popov V., Lobkovskaya T.
Acta Physica Polonica A
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1993
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vol. 84
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issue 4
733-736
EN
The temperature dependencies of coefficient of linear expansion α in the range of 4.2-300 K were obtained for SnTe samples with various degrees of deviation from stoichiometry. For the sample of stoichiometric composition in the α vs. temperature curves the anomalies connected with ferroelectric phase transition were detected. It was found that within cubic phase existence region α isotherms have a minimum at 50.4 at.% Te. Maximum dynamic stability at indicated composition is believed to be associated with the formation of vacancy superstructure.
4
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Energy Spectrum in Quantum Dots of Lead and Tin Chalcogenides Semiconducting Compounds

76%
Dugaev V., Litvinov V., Petrov P., Mironov O., Nashchekina O., Oszwałdowski M.
Acta Physica Polonica A
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1992
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vol. 82
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issue 5
797-800
EN
The energy spectrum of a quantum dot made from IV-VI narrow gap semiconductors is studied. The calculations of the energy levels as functions of the dot radius are performed. When the anisotropy of the bare energy spectrum is strong, the energy levels are calculated using Fal'kovskii's adiabatic approximation for multiband systems. When the quantum dot material has an inverted band gap with respect to the host, the low-energy states within the fundamental gap are shown to arise.
5
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Anisotropic Microwave Absorption in High-T_{c} like Semiconductor Superconducting Superlattices (001) PbTe-PbS

76%
Mironov O., Makarovskii O., Fedorenko A., Sipatov A., Nashchekina O., Zaritskii I., Konchits A.
Acta Physica Polonica A
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1994
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vol. 85
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issue 3
603-606
EN
The anisotropic microwave absorption in the presence of alternative magnetic field has been studied for the first time in superconducting super-lattices based on PbTe-PbS, which are layered anisotropic systems similar to high T_{c} superconductors. A new method of study has been used. The microwave response was detected under broad-band conditions and compared with the results of synchronous detection. All the features which have been observed in high T_{c} materials are clearly seen here.
6
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Superconductivity of Non-Strained PbTe-PbS and Strained PbTe-SnTe Superlattices

64%
Mironov O., Chistyakov S., Fedorenko A., Shpakovskaya L., Sipatov A., Savitskii B., Nashchekina O., Oszwałdowski M.
Acta Physica Polonica A
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1991
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vol. 80
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issue 3
329-332
EN
A comparative study of structural and superconductive properties of semi conductor epitaxial superlattices PbTe-SnTe and PbTe-PbS grown on (001) KCl has been carried out. It has been found that the superconductivity of the PbTe-SnTe superlattices is caused by the stretching strain in the SnTe layers and it may be connected with the relative positions of L^{+}_{8} and L^{+}_{6} terms of PbTe and SnTe, respectively in the heterojunction. In contrast to the PbTe-SnTe superlattices, the superconductivity of the PbTe-PbS super lattices is found to be associated with regular misfit dislocation grids which are generated at the interfaces.
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