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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Beznosikov B. V., Aleksandrov K. S.
Заглавие : Crystal chemistry and structure of expected compounds A2BX4. II. Oxides, selenides, and sulfides 061A2B6+X4 2- and 080A2 2+B4+X4 2-.
Место публикации : Sov. Phys.: Crystallogr. - 1985. - Vol. 30, Is. 5. - P.533-535; \b Crystallography Reports; \b Kristallografiya
Аннотация: Predictions of A2BX4 compounds for compositions 071A2 +B6+X4 2- with type structures of K2MgF4, beta -K2SO4, spinel, olivine, thenardite, phenacite, Sr2PbO4, and Pb3O4 are presented. K2MgF4 type structures are known and probable only in oxides and sulphides with hexavalent uranium because their formation is limited by the size of the hexavalent B cation. Structures of the beta -K2SO4 type are stable in compounds with large A cations. Among the sulphides with 076A2 +B6+X4 2-, the spinel crystal structure is as yet unknown, but is most probable in compounds with A+ = Li, Na, Ag, and with B6+ = Mo, W, and U. The olivine type structure is known only in Ag2CrO4, and no new compounds with this structure are expected to be found. A phenacite structure is probable only in three new oxides and in some sulphides with Li as A+. A thenardite type structure is probable in oxides with B6+ = Fe and Mn, but sulphides are unlikely. For 076A2 2+B4+X4 2- compounds with large A2+ ions and B4+ ions with radii from 0.57 A to RB 0.48RA + 0.11, a K2MgF4 structure would exist. For even larger A ions, the Sr2PbO4 structure would exist. In oxides with cations A2+ = Pb and Sn, compounds with Pb3O4 type structures are probable.-D.F.P.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Ryabinkina L. I., Abramova G. M., Balaev A. D., Balaev D. A., Bovina A. F.
Заглавие : Giant magnetoresistance of MexMn1-xS (Me = Fe, Cr) sulfides
Место публикации : JETP Letters. - 2000. - Vol. 72, Is. 2. - P.70-72. - ISSN 0021-3640, DOI 10.1134/1.1312014
Примечания : Cited References: 6
Аннотация: The structural, electrical, and magnetic properties, as well as the magnetoresistance of polycrystalline MexMn1-xS (Me = Fe and Cr) sulfides were investigated in longitudinal magnetic fields of up to 50 kOe over the temperature range 4.2-300 K. The ferromagnetic compound FexMn1-xS (x = 0.29) exhibits the giant magnetoresistance (GMR) effect with magnitude delta(H) = -450% in a field of 30 kOe at 50 K. Antiferromagnetic CrxMn1-xS (x = 0.5) sulfide undergoes a transition to the GMR state (delta(H) similar to -25% in a field of 30 kOe at 4.2 K) in the region of antiferromagnet-ferromagnet transition (T-c similar to 66 K). A mechanism of the GMR in these compounds is discussed. (C) 2000 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loseva G. V., Ovchinnikov S. G., Balaev A. D., Kiselev N. I.
Заглавие : Metal-dielectric transitions, magnetism, and electronic structure in a system of manganese-doped vanadium sulfides
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2000. - Vol. 42, Is. 3. - P539-543. - ISSN 1063-7834, DOI 10.1134/1.1131245
Примечания : Cited References: 12
Предметные рубрики: TRANSPORT
Аннотация: The effect of the manganese doping of vanadium monosulfide in a system of the V1-xMnxS (0 x less than or equal to 0.3) solid solutions on their structure and thermal, electrical, and magnetic properties has been investigated. The metal-dielectric transitions are revealed in the studied ranges of concentrations and temperatures. These transitions are accompanied by a change in the magnetic properties. It is demonstrated that the correlation in changes of the electrical and magnetic properties of the sulfides under investigation is characteristic of the metal-dielectric transitions in strongly correlated systems. (C) 2000 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Ryabinkina L. I., Abramova G. M., Velikanov D. A., Bovina A. F.
Заглавие : Antiferromagnet-ferromagnet transition in alpha-MnxS manganese sulfides
Разночтения заглавия :авие SCOPUS: Antiferromagnet-ferromagnet transition in α-MnxS manganese sulfides; авие SCOPUS: Antiferromagnet-ferromagnet transition in ?-MnxS manganese sulfides
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2001. - Vol. 43, Is. 3. - P493-495. - ISSN 1063-7834, DOI 10.1134/1.1356126; Phys. Solid State. - 2001. - Vol. 43, Is. 3. - P493-495. - Вариант Sopus
Примечания : Cited References: 7
Аннотация: Off-stoichiometric manganese monosulfides alpha -MnxS (1 less than or equal to x less than or equal to 1.25) are synthesized, and their crystal structure and magnetic properties are studied in the 4.2- to 300-K range. The compounds have a NaCl fcc lattice. Increasing the manganese ion concentration x in the antiferromagnetic semiconductors alpha -MnxS is found to result in concentration- (x(c) similar to 1.05) and temperature-driven (T-c similar to 50 K) magnetic transitions from the antiferromagnetic to ferromagnetic state, with the cubic structure remaining unchanged. (C) 2001 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Ryabinkina L. I., Abramova G. M., Balaev A. D., Romanova O. B., Makovetskii G. I., Yanushkevich K. I., Galyas A. I.
Заглавие : Magnetic properties of FexMn1-xS sulfides exhibiting the magnetoresistive effect
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2002. - Vol. 44, Is. 10. - P1925-1928. - ISSN 1063-7834, DOI 10.1134/1.1514782
Примечания : Cited References: 10
Аннотация: The magnetic, electrical, and thermal (derived from DTA data) properties of FexMn1 - xS polycrystalline sulfides (0less than or equal toxless than or equal to0.38) synthesized based on alpha-MnS (NaCl cubic lattice) and exhibiting colossal magnetoresistance were studied. The studies were conducted at temperatures from 77 to 1000 K and magnetic fields of up to 30 kOe. As the degree of cation substitution in the FexMn1 - xS system was increased, the magnetic order was found to change from antiferromagnetic to ferromagnetic. In the high-temperature domain (550-850 K), the samples undergo two phase transitions with critical temperatures T-c1 and T-c2, which are accompanied by reversible anomalies in the magnetization and thermal (DTA) properties and by a semiconductor-metal transition. (C) 2002 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskii G. A.
Заглавие : Metal-insulator transition, magnetoresistance, and magnetic properties of 3d-sulfides (Review)
Место публикации : Low Temp. Phys. - 2006. - Vol. 32, Is. 8-9. - P.725-734. - ISSN 1063-777X, DOI 10.1063/1.2219495; \b Физика низких температур
Примечания : Cited References: 74
Предметные рубрики: GIANT-MAGNETORESISTANCE
PHASE-TRANSITION
ALPHA-MNS
COLOSSAL MAGNETORESISTANCE
SINGLE-CRYSTALS
FES-MNS
SULFIDES
FERROMAGNETISM
SEMICONDUCTORS
TEMPERATURE
Аннотация: The results of a study of the transport and magnetic properties of some sulfides of 3d elements are reported. The concentration transitions with a change of conductivity type and a change of magnetic order are considered, and the features of the colossal magnetoresistance in FexMn1-xS and CuVxCr1-xS2 solid solutions are discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskii G. A., Vorotynov A. M., Velikanov A. A., Kiselev N. I., Bovina A. F., Szymczak R., Al'mukhametov R. F.
Заглавие : Phase transitions and colossal magnetoresistance in CuVxCr1-xS2 layered disulfides
Разночтения заглавия :авие SCOPUS: Phase transitions and colossal magnetoresistance in CuVxCr 1-x S2 layered disulfides
Место публикации : JETP Letters. - 2006. - Vol. 83, Is. 3. - P.118-121. - ISSN 0021-3640, DOI 10.1134/S0021364006030088
Примечания : Cited References: 10
Предметные рубрики: SULFIDES
Аннотация: New substances CuVxCr1-xS2 are synthesized in which colossal magnetoresistance (T-C = 95 K, delta(H) = -60%, H = 7 kOe), as well as the sequence of phase transitions with change in the conduction type and magnetic order, is observed as temperature is varied. The change found in the magnetic and electric properties of the CuVxCr1-xS2 compounds may be a consequence of a specific disintegration into Cu+Cr+S2 and CU2+Cr2+S2 and a change in the concentration relation between these electronic phases in the substance bulk.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskii G. A., Volkov N. V., Bayukov O. A., Vorotynov A. M., Velikanov D. A., Kiselev N., Bovina A. F., Vasiliev A. D., Sokolov V. V., Boehm M., Szymchak R., Roessli B.
Заглавие : Physical properties and colossal magnetoresistance in 3d-sulfides
Коллективы : "New Layered 3d-Materials for Spintronics", Workshop INTAS - Siberian Branch of the Russian Academy of Sciences Scientific Cooperation on the Research Project
Место публикации : Workshop INTAS - Sib. Branch of the RAS Sci. Cooperation on the Res. Project “New Layered 3d-Materials for Spintronics”/ chairman G. A. Petrakovskii. - 2007. - P.12
Аннотация: INTAS (The International Association for the Promotion of Cooperation with Scientists from the New Independent States of the Former Soviet Union) — международная ассоциация по содействию сотрудничеству с учёными новых независимых государств бывшего Советского Союза. Некоммерческая организация, финансировалась главным образом из бюджета Европейского Союза. Являлась крупнейшим фондом, поддерживающим научное сотрудничество между учёными стран бывшего СССР и Европейского Союза с 1993 г. Программы INTAS охватывали широкий круг научно-исследовательских проблем. 22 сентября 2006 года было принято решение о прекращении осуществления программы на основании рекомендации Европейской Комиссии. С 1 апреля 2007 года прекратилось распределение новых грантов.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Volkov N. V., Petrakovskii G. A., Mita Y., Bayukov O. A., Velikanov D. A., Vorotynov A. A., Sokolov V. V., Bovina A. F.
Заглавие : Metal-insulator transition in FexMn1-xS crystals
Разночтения заглавия :авие SCOPUS: Metal-insulator transition in Fe x Mn1-x S crystals
Место публикации : JETP Letters. - 2007. - Vol. 86, Is. 6. - P.371-374. - ISSN 0021-3640, DOI 10.1134/S0021364007180051
Примечания : Cited References: 15
Предметные рубрики: ALPHA-MNS
PHASE-TRANSITION
SULFIDES
Аннотация: Results of an experimental study of MnS, FeS, and FexMn1-xS single crystals are presented. The phase composition, the lattice parameters, and the state of paramagnetic ions in FexMn1-xS have been determined by x-ray diffraction analysis and Mossbauer spectroscopy. A sequence of transitions have been found in iron manganese sulfide with x = 0.29 at temperatures T-1 approximate to 25-50 K, T-2 approximate to 125 K, and T-3 approximate to 190 K with a change in kinetic properties and the formation of a metallic state at low temperatures T approximate to 2 K. The possibility of a Mott-Hubbard transition in FexMn1-xS sulfides with variation of the composition and the temperature is discussed.
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