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Superconductivity near liquid nitrogen temperature in the Sn-Ba-Sr-Y-Cu-O system / K. S. Aleksandrov [et al.] // Physica C-Superconductivity and its Applications. - 1989. - Vol. 161, Is. 4. - P. 493-496, DOI 10.1016/0921-4534(89)90087-7 . - ISSN 0921-4534
Кл.слова (ненормированные):
Ceramic Materials -- Tin Compounds -- Bulk Superconductivity -- High Temperature Superconductors -- Oxide Superconductors -- Tin Barium Strontium Yttrium Copper Oxide -- Superconducting Materials
Аннотация: A high-Tc phase was found in the Sn-Ba-Sr-Y-Cu-O system. DC susceptibility data of Sn2Ba2Sr0.5Y0.5Cu3Ox show a single transition to bulk superconductivity with an onset temperature of 86 K. В© 1989.

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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Khrustalev, B. P.; Хрусталев, Борис Петрович; Krivomazov, S. N.; Петров, Михаил Иванович; Petrov, M. I.; Vasilyev, A. D.; Zwegintsev, S. A.
}
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Ovchinnikov, S. G.
Quasi-particle spectrum in copper oxides / S. G. Ovchinnikov, G. A. Petrakovsky // J. Supercond. - 1991. - Vol. 4, Is. 6. - P. 437-448, DOI 10.1007/BF00635862. - Cited References: 0 . - ISSN 0896-1107

РУБ Physics, Applied + Physics, Condensed Matter

Кл.слова (ненормированные):
ELECTRON CORRELATIONS -- ELECTRON ENERGY STRUCTURE -- COPPER OXIDE -- PHOTOEMISSION DATA -- copper oxide -- Electron correlations -- electron energy structure -- photoemission data -- Ceramic Materials -- Lanthanum Compounds -- Fermi Liquid -- Lanthanum Strontium Copper Oxides -- Oxide Superconductors -- Quasi Particles -- High Temperature Superconductors
Аннотация: The results of electronic structure calculations of the CuO2 layer, performed by the generalized tight-binding method, are presented. The strong electron correlations on both the Cu and O ions are included explicitly. The resulting quasiparticle band structure contains an insulator gap for undoped compounds like La2CuO4. The valence band consists of a large number of narrow Hubbard quasiparticle bands. The dispersion law of quasiparticles at the top of the valence band has a minimum at the GAMMA-point, indicating the existence of the multivalley Fermi surface in the doped La2-xSrxCuO4. The origin of the Fermi liquid behavior in the narrow quasiparticle bands is discussed.

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Держатели документа:
L. V. Kirensky Institute of Physics, Siberian Department of the USSR Academy of Sciences, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Petrakovsky, G. A.; Петраковский, Герман Антонович; Овчинников, Сергей Геннадьевич
}
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Babkin, E. V.
Magnetic-properties of ferrimagnetic iron-oxide gamma-Fe2O3 / E. V. Babkin, K. P. Koval, V. G. Pynko // Zhurnal Eksperimentalnoi Teor. Fiz. - 1991. - Vol. 100, Is. 2. - P. 582-589. - Cited References: 10 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary

Аннотация: The results of an investigation of the magnetic properties of iron oxide gamma-Fe2O3 are presented. Epitaxial crystallization on a magnesium oxide backing ensured the stability of the compound in a broad temperature range. The temperature dependences of the magnetization and magnetic anisotropy constants are measured. The magnetization of the sublattices and the single-ion anisotropy constants foh the Fe3+ ion are determined. A magnetic anisotropy induced by the growth of the film is observed, its nature being dependent on the crystallographic orientation of the backing. It is shown that the cause of the appearance of the anisotropy is the ordering of the cation vacancies during the growth of the film.

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Доп.точки доступа:
Koval, K. P.; Коваль, Клавдия Павловна; Pynko, V. G.; Пынько, Виталий Григорьевич
}
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    Improper ferroelectric phase due to condensation of two order parameters in crystals of high-temperature superconductors / G. M. Chechin [et al.] // Ferroelectrics. - 1992. - Vol. 130, Is. 1. - P. 155-162. - Cited References: 21 . - ISSN 0015-0193
Рубрики:
TRANSITIONS
   FERROELASTICS
   RB3CD2CL7
Кл.слова (ненормированные):
Ceramic materials -- Crystals -- Ferroelectricity -- Phase diagrams -- Order parameters -- Oxide superconductors -- High temperature superconductors
Аннотация: Using group-theoretical methods it is shown that improper ferroelectric phase may arise in high-temperature superconductors (HTSC) where high-symmetry phases have space groups D4h1 or D4h17. Their appearance is caused by condensation of order parameters (OP's) transforming two irreducible representations (IR's). The most typical phase diagrams are considered, as well as temperature dependence of OP's and the basic structural mechanism of the ferroelectricity arising in the HTSC.

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Держатели документа:
Rostov-on-Don Univ, Rostov, Russian Federation

Доп.точки доступа:
Chechin, G. M.; Sakhnenko, V. P.; Misyul, S. V.; Мисюль, Сергей Валентинович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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Ovchinnikov, S. G.
EFFECT OF ANTIFERROMAGNETIC ORDERING ON ZONE STRUCTURE OF LA2CUO4 / C. G. OVCHINNIKOV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1995. - Vol. 107, Is. 3. - P. 796-811. - Cited References: 42 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TC SUPERCONDUCTORS
   ELECTRONIC-STRUCTURE
   OXIDE SUPERCONDUCTORS
   CHARGE-TRANSFER
   CUO2 PLANE
   MODEL
   HOLE
   SPECTRUM
   STATE

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Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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Characteristics of current flow in composites made from a high-temperature superconductor and the low-temperature superconducting metal oxide Ba(PbBi)O-3 / M. I. Petrov [et al.] // Phys. Solid State. - 1997. - Vol. 39, Is. 3. - P. 362-368, DOI 10.1134/1.1130134. - Cited References: 21 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
BAPB1-XBIXO3 SYSTEM
YBA2CU3O7-DELTA
Аннотация: Composites are prepared from a high-temperature superconductor with the 1-2-3 structure and the low-temperature oxide BaPb3/4Bi1/4O3 with various volume concentrations of the high-temperature and low-temperature superconductors. The temperature dependences of the electrical resistivities and critical current densities of the composites are measured. It is shown experimentally that these composites comprise a synthetically created network of Josephson weak links (with a specified degree of coupling). (C) 1997 American Institute of Physics.

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Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Ospishchev, S. V.; Оспищев С. В.; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Khrustalev, B. P.; Хрусталев, Борис Петрович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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Zamkova, N. G.
Lattice dynamics of ionic crystals in a model of "breathing" and polarizable ions / N. G. Zamkova, V. I. Zinenko // Phys. Solid State. - 1998. - Vol. 40, Is. 2. - P. 320-324, DOI 10.1134/1.1130302. - Cited References: 14 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
OXIDE
Аннотация: An expression is written down for the dynamic matrix of ionic crystals in terms of a microscopic, parameterless model of "breathing" and polarizable ions. Results from a calculation of the complete spectrum of the lattice vibrations of ionic crystals having an NaCl structure are presented as an illustration. (C) 1998 American Institute of Physics.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Zinenko, V. I.; Зиненко, Виктор Иванович; Замкова, Наталья Геннадьевна
}
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Microscopic model of the coexistence of superconductivity and ferromagnetism in the hybrid ruthenate-cuprate oxide RuSr2GdCu2O8 / E. V. Kuz'min [et al.] // J. Exp. Theor. Phys. - 2000. - Vol. 91, Is. 2. - P. 353-360, DOI 10.1134/1.1311995. - Cited References: 37 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   HUBBARD-MODEL
   LAYERED PEROVSKITE
   SR2RUO4
   ELECTRONS
   COPPER
   SPECTRUM
Аннотация: A microscopic t-J-I model with competing antiferromagnetic (J) and ferromagnetic (I) exchange interactions is proposed for strongly correlated electrons in RuSr2GdCu2O8 . It is assumed that J much greater than I for CuO2 layers and J much less than I for RuO2 layers. A superconducting solution of d(x2-y2) symmetry was obtained for the CuO2 layers while competition between ferromagnetism and p-type triplet superconducting pairing is obtained for RuO2 layers. It is shown that the RuO2 layers have a lower carrier concentration in the Hubbard subband formed by coupled ((d(xy)-p)-pi) orbitals compared with a bulk Sr2RuO4 crystal, which leads to stabilization of the ferromagnetic state in the RuO2 layer. (C) 2000 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Микроскопическая модель сосуществования сверхпроводимости и ферромагнетизма в гибридном рутенатно-купратном оксиде RuSr2GdCu2O8 [Текст] / Е. В. Кузьмин [и др.] // Журн. эксперим. и теор. физ. - 2000. - Т. 118 Вып. 2.- С.404

Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk 660062, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Kuz'min, E. V.; Кузьмин, Евгений Всеволодович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Baklanov, I. O.; Бакланов И. О.; Goryachev, E. G.; Горячев, Евгений Геннадьевич
}
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Avramov, P. V.
Effects of strong electron correlations in X-ray and electron spectra of high-T-c superconductors / P. V. Avramov, S. G. Ovchinnikov // Phys. Solid State. - 2000. - Vol. 42, Is. 5. - P. 788-809, DOI 10.1134/1.1131293. - Cited References: 92 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   COPPER-OXIDE SUPERCONDUCTORS
   MULTIPLE-SCATTERING ANALYSIS
   HIGH-ENERGY SPECTROSCOPY
   ABSORPTION-SPECTRA
   PHOTOELECTRON-SPECTRA
   EDGE STRUCTURE
   PHOTOEMISSION SPECTRA
   INCOMPLETE SHELL
   SINGLE-CRYSTAL
Аннотация: The current state of theoretical and experimental studies on the electronic structure of high-T-c superconductors is analyzed. The agreement between the theory and experimental spectroscopic data is shown to be rather poor in certain cases. The reason is that the X-ray and electronic spectra reveal strong electron correlations. At the same time, no realistic model has been developed up to now in which both one-electron and multielectron mechanisms of the formation of the spectra could be described in a unified way in compounds containing transition and rare-earth elements. In this paper, particular attention is paid to a sudden-perturbation model, by which it has been possible to describe or interpret some X-ray and electronic spectra, including both one-electron and multielectron effects. (C) 2000 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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10.

Magnetooptic activity of f-d and f-f electron transitions in Pr3+ in the glass matrix LiB3O5 / A. M. Potseluyko [et al.] // Physica B. - 2000. - Vol. 291, Is. 1-2. - P. 89-96, DOI 10.1016/S0921-4526(99)01869-4. - Cited References: 17 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
FARADAY-ROTATION
OXIDE GLASSES
Кл.слова (ненормированные):
Faraday rotation -- magnetooptic activity -- praseodymium -- Electron transitions -- Faraday effect -- Light absorption -- Lithium compounds -- Praseodymium compounds -- Faraday rotation -- Transition wavelength -- Optical glass
Аннотация: The results of absorption, Faraday rotation and magnetic circular dichroism measurements for glasses with the composition of LiB3O5 + Pr2O3 are presented. The effective wavelength of the transition giving the main contribution to Faraday rotation in these glasses is determined. The contributions of several f-f transitions to Faraday rotation are separated and their magnetooptical activities are evaluated in comparison with the activity of the f-d transition. (C) 2000 Elsevier Science B.V. All rights reserved.

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, SB RAS, 660036, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Potseluyko, A. M.; Edelman, I. S.; Эдельман, Ирина Самсоновна; Zabluda, V. N.; Заблуда, Владимир Николаевич; Bolsunovskaya, O. A.; Zamkov, A. V.; Замков, Анатолий Васильевич; Parshikov, S. A.; Zaytsev, A. I.
}
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