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1.
Avramov, P. V.
Effects of the intense electron correlations on the shape of x-ray CuK absorption spectra of La2-xSrxCuO4 / P. V. Avramov, S. G. Ovchinnikov> // Zhurnal Eksperimentalnoi Teor. Fiz. - 1995. -
Vol. 108
,
Is. 4
. - P. 1479-1488. - Cited References: 28 . - ISSN 0044-4510
РУБ
Physics, Multidisciplinary
Рубрики:
HIGH-TC SUPERCONDUCTIVITY
EDGE STRUCTURE
LA2CUO4
SATELLITES
ALPHA
EXCITATIONS
COPPER
OXIDES
STATE
SHAKE
WOS
Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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2.
First outer-sphere 1,3-diethyl-2-thiobarbituric
compounds [M(H2O)6](1,3-diethyl-2-thiobarbiturate)2·2H2O (M = Co2+, Ni2+): Crystal structure, spectroscopic and thermal properties / N. N. Golovnev [et al.]> // Chem. Phys. Lett. - 2016. -
Vol. 653
. - P. 54-59,
DOI
10.1016/j.cplett.2016.04.059. - Cited References: 50. - The study was carried out within the public task of the Ministry of Education and Science of the Russian Federation for research engineering of the Siberian Federal University in 2015-2016. V.V. A. is grateful to the Ministry of Education and Science of the Russian Federation for the financial support of the investigation. X-ray data were obtained with use the analytical equipment of Krasnoyarsk Center of collective use of SB RAS. . - ISSN 0009-2614
Перевод заглавия:
Первые соединения с внешнесферным 1,3-диэтил-2-тиобарбитуратом [M(H2O)6](1,3-диэтил-2-2тиобарбитурат)2·2H2O (M=Co2+, Ni2+): кристаллическая структура, спектроскопия и тепловые свойства
РУБ
Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
Thiobarbituric acid complexes
Transition-metal-complexes; 2-thiobarbituric acid; hydrogen-bond
2-thiobarbituric acid
Hydrogen-bond
Chemistry
Transformation
Diffraction
Ligand
Series
Copper
Кл.слова (ненормированные):
1,3-Diethyl-2-thiobarbituric acid
--
Nickel(II)
--
Cobalt(II)
--
Coordination compound
--
X-ray diffraction
--
Infrared spectroscopy
--
Thermal analysis
Аннотация:
Two new d-element compounds, [Co(H2O)6](Detba)2·2H2O (1) and [Ni(H2O)6](Detba)2·2H2O (2) (HDetba - 1,3-diethyl-2-thiobarbituric acid) were synthesized and characterized by single-crystal and powder X-ray diffraction analysis, TG-DSC and FT-IR. Structural analysis revealed that (1) and (2) are discrete structures, in which M2+ ion (M = Co, Ni) is six-coordinated by water molecules and it forms an octahedron. The outer-sphere Detba- ions and H2O molecules participate in O-H?(O/S) intermolecular hydrogen bonds which form the 2D layer. Thermal decomposition includes the stage of dehydration and the following stage of oxidation of Detba- with a release of CO2, SO2, H2O, NH3 and isocyanate gases. © 2016 Elsevier B.V. All rights reserved.
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Держатели документа:
Department of Chemistry, Siberian Federal University, 79 Svobodny Aven., Krasnoyarsk, Russian Federation
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, bld. 38, Akademgorodok 50, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, 47 Seryshev Str., Khabarovsk, Russian Federation
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, 13 Lavrentiev Aven., Novosibirsk, Russian Federation
Functional Electronics Laboratory, Tomsk State University, 36 Lenin Aven., Tomsk, Russian Federation
Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, 2 Pirogov Str., Novosibirsk, Russian Federation
Доп.точки доступа:
Golovnev, N. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lesnikov, M. K.; Atuchin, V. V.
}
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3.
Shneyder, E. I.
Isotope effect in the model of strongly correlated electrons with the magnetic and phonon superconducting pairing mechanisms / E. I. Shneyder, S. G. Ovchinnikov> // J. Exp. Theor. Phys. - 2009. -
Vol. 109
,
Is. 6
. - P. 1017-1021,
DOI
10.1134/S1063776109120139. - Cited References: 42. - This study was financed under programs 5.7 and "Quantum Physics of Condensed Matter" of the Presidium of the Russian Academy of Sciences, integration project no. 40 of the Siberian Branch and Ural Division of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 09-02-00127). . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
CUPRATE SUPERCONDUCTORS
PHASE-TRANSITIONS
3-CENTER INTERACTIONS
HUBBARD-MODEL
TEMPERATURE
LA2-XSRXCUO4
SYMMETRY
EXCHANGE
COPPER
BI2SR2CACU2O8+DELTA
Кл.слова (ненормированные):
Ab initio calculations
--
Calculated values
--
Cooper pairing
--
Isotope effect
--
Magnetic mechanisms
--
Order of magnitude
--
Pairing mechanism
--
Phonon mechanism
--
Strongly correlated electrons
--
Superconducting pairing mechanism
--
Superconducting state
--
Type theory
--
Carrier mobility
--
Electron-phonon interactions
--
Isotopes
--
Superconductivity
--
Superconducting magnets
Аннотация:
Peculiarities of the temperature isotope effect in a BCS-type theory describing the exchange and phonon mechanisms of Cooper pairing in a system of strongly correlated electrons are considered. The electron-phonon interaction constant is determined from the fitting of the calculated value of the isotope-effect index to the observed value with the parameters of La(2 - x) Sr (x) CuO(4) obtained from ab initio calculations. The value of this constant indicates that the contribution from the traditional pairing mechanism to the superconducting state is of the same order of magnitude as the contribution from the magnetic mechanism.
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Публикация на русском языке
Шнейдер, Елена Игоревна. Изотопический эффект в модели сильно коррелированных электронов, учитывающей магнитный и фононный механизмы сверхпроводящего спаривания [Текст] / Е. И. Шнейдер, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 2009. - Т. 136 Вып. 6. - С. 1177-1182
Держатели документа:
[Shneyder, E. I.
Ovchinnikov, S. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Shneyder, E. I.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, 660014, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Шнейдер, Елена Игоревна; Presidium of the Russian Academy of Sciences [40]; Russian Academy of Sciences; Russian Foundation for Basic Research [09-02-00127]
}
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4.
Magnetic phase transitions
in the double spin-chains compound LiCu2O2 / B. . Roessli [et al.]> // Physica B. - 2001. -
Vol. 296
,
Is. 4
. - P. 306-311,
DOI
10.1016/S0921-4526(00)00574-3. - Cited References: 17 . - ISSN 0921-4526
РУБ
Physics, Condensed Matter
Рубрики:
ORDERED MOMENT
COPPER
CRYSTAL
LI2CUO2
Кл.слова (ненормированные):
muon-spin rotation
--
spin ladder
--
magnetic ordering
--
LiCu2O2
--
Crystal structure
--
Lithium compounds
--
Magnetic anisotropy
--
Magnetic field effects
--
Magnetic relaxation
--
Magnetization
--
Order disorder transitions
--
Specific heat of solids
--
X ray diffraction analysis
--
Anisotropic line broadening
--
Muon spin rotation
--
Spin ladder
--
Antiferromagnetic materials
Аннотация:
We report high-resolution X-ray diffraction, muon-spin-rotation spectroscopic and specific heat measurements in the double spin-chains compound LiCu2O2. The X-ray diffraction results show that the crystal structure of LiCu2O2 is orthorhombic down to T = 10 K. Anisotropic line-broadening of the diffraction peaks is observed, indicating disorder along the spin chains. Muon-spin relaxation and specific heat measurements show that LiCu2O2 undergoes a phase transition to a magnetic ordered state at T-1 similar to 24 K. The specific heat data exhibits a second lambda -like peak at T-2 similar to 32.5 K, which increases with increasing magnetic field in a similar way to that found in spin-ladder compounds. (C) 2001 Elsevier Science B.V. All rights reserved.
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Держатели документа:
Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
ETH Zurich, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland
Univ Lausanne, Inst Crystallog, CH-1015 Lausanne, Switzerland
RAS, SB, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Laboratory for Neutron Scattering, Paul Scherrer Inst. and ETH Zurich, CH-5232 Villigen PSI, Switzerland
Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Lab. for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Institut de Crystallographie, Universite de Lausanne, CH-1015 Lausanne, Switzerland
Institute of Physics SB RAS, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Roessli, B.; Staub, U.; Amato, A.; Herlach, D.; Pattison, P.; Sablina, K. A.; Саблина, Клара Александровна; Petrakovskii, G. A.; Петраковский, Герман Антонович
}
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5.
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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6.
Redox potentials of
gold-palladium powders in aqueous solutions of H2PdCl4 / O. V. Belousov [et al.]> // Russ. J. Phys. Chem. A. - 2012. -
Vol. 86
,
Is. 3
. - P. 484-488,
DOI
10.1134/S0036024412020070. - Cited References: 26 . - ISSN 0036-0244
РУБ
Chemistry, Physical + Powders
Рубрики:
BIMETALLIC NANOPARTICLES
METALLIC PALLADIUM
COPPER
ELECTRODE
BLACK
Bimetallic particles
Bimetallic powders
Gold-palladium
Hydrochloric acid solution
Nernst equation
Redox potentials
Gold
Hydrochloric acid
Redox reactions
Secondary batteries
Transmission electron microscopy
X ray diffraction analysis
Кл.слова (ненормированные):
bimetallic powders
--
gold-palladium
--
redox potential
Аннотация:
The redox potential of fine-dispersed and compact bimetallic powders of the palladium-gold system in hydrochloric acid solutions of H2PdCl4 at a temperature of 60A degrees C was studied. It was found that the redox potential increases with gold enrichment of the solid solution in accordance with the Nernst equation. The effect of gold-palladium particle size on this redox potential is shown. The morphology, sizes, and composition of bimetallic particles are determined via transmission electron microscopy and X-ray diffraction analysis.
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Публикация на русском языке
Окислительно-востановительные потенциалы золото-палладиевых порошков в водных растворах H2PdCl4 [Текст] / О. В. Белоусов [и др.] // Журн. физ. химии : Наука, 2012. - Т. 86 № 3. - С. 557-562
Держатели документа:
[Belousov, O. V.
Borisov, R. V.
Parfenov, V. A.
Dorokhova, L. I.] Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660041, Russia
[Zharkov, S. M.] Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Zharkov, S. M.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
Доп.точки доступа:
Belousov, O. V.; Borisov, R. V.; Zharkov, S. M.; Жарков, Сергей Михайлович; Parfenov, V. A.; Dorokhova, L. I.
}
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7.
Ovchinnikov, S. G.
The Interplay of Phonon and Magnetic Mechanism of Pairing in Strongly Correlated Electron System of High-T-c Cuprates / S. G. Ovchinnikov, E. I. Shneyder> // J. Supercond. Nov. Magn. - 2010. -
Vol. 23
,
Is. 5
. - P. 733-736,
DOI
10.1007/s10948-009-0633-z. - Cited References: 26. - This work is supported by the Presidium RAS program N 7 "Quantum physics of condensed matter," the integration project SORAN-UrORAN N 40, and the RFFI Grant 09-02-00127. . - ISSN 1557-1939
РУБ
Physics, Applied + Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
OXIDE SUPERCONDUCTORS
SYMMETRY
COPPER
MODEL
BAND
BI2SR2CACU2O8+DELTA
LA2-XSRXCUO4
PB
Кл.слова (ненормированные):
High-T-c superconductivity
--
Strong correlated electron systems
--
Mechanisms of superconducting pairing
--
High-T c superconductivity
--
Mechanisms of superconducting pairing
--
Strong correlated electron systems
--
Ab initio
--
Buckling mode
--
Correlated electron systems
--
Critical temperatures
--
Cuprates
--
Fitting parameters
--
High-T
--
Isotope effect
--
Low energies
--
Magnetic mechanisms
--
Order of magnitude
--
Phonon mode
--
Strongly correlated electron system
--
Strongly correlated electrons
--
Superconducting pairing
--
Superconductivity mechanism
--
Type theory
--
Buckling
--
Copper
compounds
--
Electrons
--
Isotopes
--
Magnetic materials
--
Phonons
--
Superconductivity
--
Superconducting magnets
Аннотация:
We consider magnetic mechanism of superconducting pairing in the effective low energy t - t' - t '' - J* model with all parameters calculated ab initio. Interaction of strongly correlated electrons with different phonon modes is also incorporated. In a BCS type theory, the d(x2-y2) gap is given by a sum of magnetic and phonon contributions. The main contribution to the only fitting parameter G is determined by a competition of the breathing and buckling modes. Fitting the parameter G from the isotope effect, we obtain that magnetic and phonon contributions to the critical temperature T-c work together and are of the same order of magnitude.
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Держатели документа:
[Ovchinnikov, S. G.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, 660041 Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, 660014 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
}
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