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Transport properties of HTSC-based composites: Modeling the random networks of Josephson weak links with magneto-active barriers. / K. A. Shaihutdinov [et al.] // J. Low Temp. Phys. - 2003. - Vol. 130, Is. 3-4. - P. 347-381, DOI 10.1023/A:1022204705059. - Cited References: 89 . - ISSN 0022-2291

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
CURRENT-VOLTAGE CHARACTERISTICS
   HIGH-TEMPERATURE SUPERCONDUCTORS
   SNS JUNCTIONS
   THERMAL FLUCTUATIONS
   RESISTIVE PROPERTIES
   PERCOLATION SYSTEM
   TRANSITION
   YBA2CU3O7
   BOUNDARY
   OXIDES
Кл.слова (ненормированные):
Crystalline materials -- Electric insulators -- Josephson junction devices -- Magnetic devices -- Magnetic barriers -- Superconducting materials -- composite
Аннотация: The results of the study of transport properties (temperature dependences of resistivity and critical current, current-voltage characteristics) of two-phase composites on the basis of Y3/4Lu1/4Ba2Cu3O7 high-temperature superconductor (HTSC) produced by fast baking technique and modelling networks of Josephson-type weak links are reported. Non-superconducting ingredients with different magnetic structures, insulators and normal metals, function as barriers between HTSC crystallites. Besides strong suppression of superconducting properties in HTSC composites with magnetic barriers, anomalous behavior of temperature dependences of resistivity below T-c of HTSC grains have been observed and investigated.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian St. Aerosp. Univ., Krasnoyarsk 660014, Russian Federation
Krasnoyarsk State University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Shaihutdinov, K. A.; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович; NATO Advanced Research Workshop on Vortex Dynamics in High-Temperature Superconductors(2002 ; May ; 17-22)
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OVCHINNIKOV, S. G.
THE INFLUENCE OF THE ANTIFERROMAGNETISM ON THE ELECTRONIC-STRUCTURE OF LA2CUO4 / S. . OVCHINNIKOV // J. Supercond. - 1995. - Vol. 8: University-of-Miami Workshop on High-Temperature Superconductivity - Physical Properties and Mechanisms (JAN 05-11, 1995, CORAL GABLES, FL), Is. 5. - P. 675-676, DOI 10.1007/BF00727473. - Cited References: 15 . - ISSN 0896-1107

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
OXIDES
MODEL
Кл.слова (ненормированные):
ELECTRON CORRELATIONS -- ELECTRON STRUCTURE -- SPIN FLUCTUATIONS -- Electron correlations -- electron structure -- spin fluctuations -- Antiferromagnetism -- Band structure -- Calculations -- Correlation theory -- Electrons -- Lanthanum compounds -- Paramagnetism -- Perturbation techniques -- Antiferromagnetic phase -- Electron correlations -- Intercluster interactions -- Spin fluctuations -- Electronic structure
Аннотация: The quasiparticle approach for electronic structure calculations considering strong electron correlations is given. The exact diagonalization of a multiband Hubbard Hamiltonian for a small cluster is combined with perturbation theory for intercluster hopping. The band structure of paramagnetic and antiferromagnetic La2CuO4 are discussed.

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Держатели документа:
L.V.Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
}
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The Fermi surface and the role of electronic correlations in Sm2-xCexCuO4 / M. M. Korshunov [et al.] // J. Phys.: Condens. Matter. - 2010. - Vol. 22, Is. 1. - Ст. 15701, DOI 10.1088/0953-8984/22/1/015701. - Cited References: 35. - We would like to thank A A Kordyuk and I Eremin for useful discussions. The authors acknowledge support from RFBR (grants 08-02-00021, 10-02-00662, 08-02-91200 and 07-02-00226), the RAS programs on 'Low temperature quantum phenomena', 'Quantum physics of condensed matter' and 'Strongly correlated electrons solids', President of Russia (grants MK-614.2009.2 (IN) and MK-3227.2008.2 (ZP)), Scientific School (grant SS-1929.2008.2), Interdisciplinary UB-SB RAS project, Dynasty Foundation (ZP) and Russian Science Support Foundation (IN). . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
T-C SUPERCONDUCTOR
   IN-GAP STATES
   SPIN CORRELATIONS
   BAND
   LA2-XSRXCUO4
   EXCITATIONS
   TRANSITION
   EVOLUTION
   SM2CUO4
   OXIDES
Кл.слова (ненормированные):
Antiferromagnetics -- Doping evolution -- Electron-doped -- Electronic correlation -- Emery model -- Experimental data -- Generalized tight bindings -- High-T -- Hybrid scheme -- Magnetic orders -- Spin-liquid -- Tight binding model -- Two-regime -- Antiferromagnetism -- Cerium -- Cerium compounds -- Copper oxides -- Corundum -- Doping (additives) -- Fermi surface -- Fermions -- Tin -- Surfaces
Аннотация: Using a LDA + GTB (local density approximation + generalized tight-binding) hybrid scheme we investigate the band structure of the electron-doped high-T-c material Sm2-xCexCuO4. Parameters of the minimal tight-binding model for this system (the so-called three-band Emery model) were obtained within the NMTO (Nth-order muffin-tin orbital) method. The doping evolution of the dispersion and the Fermi surface in the presence of electronic correlations was investigated in two regimes of magnetic order: short-range (spin-liquid) and long-range (antiferromagnetic metal). Each regime is characterized by the specific topologies of the Fermi surfaces and we discuss their relation to recent experimental data.

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Держатели документа:
[Korshunov, M. M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Korshunov, M. M.
Zakharova, E. V.
Ovchinnikov, S. G.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Nekrasov, I. A.] Russian Acad Sci, Inst Electrophys, Ekaterinburg 620016, Russia
[Pchelkina, Z. V.] Russian Acad Sci, Inst Met Phys, Ekaterinburg 620219, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
L v Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Institute for Electrophysics, Russian Academy of Sciences, Ekaterinburg 620016, Russian Federation
Institute for Metal Physics, Russian Academy of Sciences, Ekaterinburg 620219, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Zakharova, E. V.; Nekrasov, I. A.; Pchelkina, Z. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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Synthesis, structural, magnetic, and electronic properties of cubic CsMnMoO3F3 oxyfluoride / V. V. Atuchin [et al.] // J. Phys. Chem. C. - 2012. - Vol. 116, Is. 18. - P. 10162-10170, DOI 10.1021/jp302020f. - Cited References: 64. - We thank Dr. A.M. Ziatdinov for the electron paramagnetic resonance measurements. This study was partly supported by SB RAS (Grant 28). . - ISSN 1932-7447

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
RAY PHOTOELECTRON-SPECTROSCOPY
   PHASE-TRANSITIONS
   CORE LEVELS
   SURFACE CHARACTERIZATION
   CRYSTAL-STRUCTURE
   CLEAVED SURFACE
   MIXED-VALENCE
   OXIDES
   MN
   MOLYBDENUM
   Chemical bondings
   Cubic phase
   Energy differences
   Heat capacity measurements
   Oxyfluorides
   Powder samples
   Solid-state synthesis
   Space Groups
   Temperature range
   Valence electron
   Binding energy
   Chemical bonds
   Electronic structure
   Fluorine compounds
   Magnetic properties
   Metal ions
   Photoelectrons
   Rietveld method
   X ray photoelectron spectroscopy
   Electronic properties
Аннотация: A powder sample of CsMnMoO3F3 oxyfluoride has been prepared by solid state synthesis. The pyrochlore-related crystal structure of CsMnMoO3F3 has been refined by the Rietveld method at T = 298 K (space group Fd-3m, a = 10.59141(4) angstrom, V = 1188.123(8) angstrom(3); R-B = 3.44%). The stability of the cubic phase has been obtained over the temperature range T = 110-293 K by heat capacity measurements. Magnetic properties have been measured over the range of T = 2-300 K. The electronic structure of CsMnMoO3F3 has been evaluated by X-ray photoelectron spectroscopy. Chemical bonding effects have been discussed for all metal ions using binding energy difference parameters and wide comparison with related oxides and fluorides. The competition between O-2(-) and F- ions for metal valence electrons has been found.

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Держатели документа:
Atuchin, Victor V.
Gavrilova, Tatyana A.
Kesler, Valery G.] SB RAS, Inst Semicond Phys, Novosibirsk 630090, Russia
Molokeev, Maxim S.
Yurkin, Gleb Yu.
Flerov, Igor N.
Patrin, Gennadii S.] SB RAS, Inst Phys, Krasnoyarsk 660036, Russia
Laptash, Natalia M.] FEB RAS, Inst Chem, Vladivostok 690022, Russia
Flerov, Igor N.
Patrin, Gennadii S.] Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia

Доп.точки доступа:
Atuchin, V. V.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Yurkin, G. Yu.; Юркин, Глеб Юрьевич; Gavrilova, T. A.; Kesler, V. G.; Laptash, N. M.; Flerov, I. N.; Флёров, Игорь Николаевич; Patrin, G. S.; Патрин, Геннадий Семёнович
}
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    Structural, spectroscopic, and electronic properties of cubic G0-Rb2KTiOF5 oxyfluoride / V. V. Atuchin [et al.] // J. Phys. Chem. C. - 2013. - Vol. 117, Is. 14. - P. 7269-7278, DOI 10.1021/jp401391y. - Cited References: 80. - This study was supported by SB RAS (Grant 28.13), the National Natural Science Foundation of China under Grants 11174297 and 91022036, and the National Basic Research Project of China (Nos. 2010CB630701 and 2011CB922204). . - ISSN 1932-7447
   Перевод заглавия: Структурные, спектроскопические и электронные свойства кубического оксифторида G0-Rb2KTiOF5.

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
RAY PHOTOELECTRON-SPECTROSCOPY
   SURFACE CHEMICAL-STABILITY
   EFFECTIVE IONIC-RADII
   PHASE-TRANSITIONS
   CRYSTAL-GROWTH
   HEAT-CAPACITY
   CORE LEVELS
   RB2KTIOF5
   FLUORIDES
   OXIDES
Аннотация: The G0-Rb2KTiOF5 single crystals with dimensions up to nearly a centimeter in size have been prepared by slow solidification method. The elpasolite-related crystal structure of G0-Rb2KTiOF5 has been refined by Rietveld method at T = 298 K (space group Fm (3) over barm, Z = 4, a = 8.880(1) angstrom, V = 700.16(2) angstrom(3); R-B = 2.66%). The wide optical transparency range of 0.25-9 mu m and forbidden band gap of E-g = 3.87 eV have been obtained for the G0-Rb2KTiOF5 crystal. Dominating photoluminescence bands at 3.36 and 2.33 eV are related to free and self-trapped excitons, respectively. The electronic structure of G0-Rb2KTiOF5 has been evaluated by X-ray photoelectron spectroscopy and calculated with the first-principles methods. A good agreement between theoretical and experimental results has been achieved. Chemical bonding effects have been discussed for all metal ions using binding energy difference parameters and a wide comparison with related oxides and fluorides. The competition between O2- and F- ions for metal valence electrons has been found.

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Держатели документа:
Russian Acad Sci, Lab Opt Mat & Struct, Inst Semicond Phys, Novosibirsk 630090, Russia
Russian Acad Sci, Inst Geol & Mineral, Lab Crystal Growth, Siberian Branch, Novosibirsk 630090, Russia
Russian Acad Sci, Inst Semicond Phys, Lab Phys Bases Integrated Microelect, Siberian Branch, Novosibirsk 630090, Russia
Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Funct Crystals & Laser Technol, BCCRD, Beijing 100190, Peoples R China
Russian Acad Sci, Siberian Branch, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

Доп.точки доступа:
Atuchin, V. V.; Isaenko, L. I.; Kesler, V. G.; Kang, L.; Lin, Z. S.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Yelisseyev, A. P.; Zhurkov, S. A.
}
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Spin-crossover-induced Mott transition and the other scenarios of metallization in 3d(n) metal compounds / I. S. Lyubutin [et al.] // Phys. Rev. B. - 2009. - Vol. 79, Is. 8. - Ст. 85125, DOI 10.1103/PhysRevB.79.085125. - Cited References: 41 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
RARE-EARTH ORTHOFERRITES
   NARROW ENERGY BANDS
   HIGH-PRESSURE
   MAGNETIC COLLAPSE
   ELECTRON CORRELATIONS
   PHASE-TRANSITION
   STATE
   Y3FE5O12
   OXIDES
   EQUATION
Кл.слова (ненормированные):
bismuth compounds -- Hubbard model -- localised states -- metal-insulator transition -- metallisation -- spin systems
Аннотация: A different "Hubbard energy control" mechanism of the insulator-metal transition (IMT) in Mott-Hubbard insulators is discussed. This mechanism can be initiated by the lattice compression and it is driven by a spin crossover of 3d(5) ions from the high-spin state to the low-spin state. The spin crossover suppresses the effective Hubbard parameter U-eff down to the value enabling the insulator-metal transition according to the Mott mechanism U-eff/W approximate to 1. The classification of possible scenarios of metallization in the other 3d(n) metal compounds is also performed.

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Держатели документа:
[Lyubutin, I. S.] Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
[Ovchinnikov, S. G.] Russian Acad Sci, Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
[Gavriliuk, A. G.] RAS, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
[Struzhkin, V. V.] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA
ИФ СО РАН
Institute of Crystallography, Russian Academy of Sciences, Leninsky Pr. 59, Moscow 119333, Russian Federation
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Institute for High Pressure Physics, RAS, Troitsk, Moscow Region, Russian Federation
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States

Доп.точки доступа:
Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gavriliuk, A. G.; Struzhkin, V. V.
}
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Val'kov, V. V.
Renormalization of Energy Structure and Oscillation Period in the de Haas-van Alphen Effect at the Strong Intersite Coulomb Interaction / V. . Val'kov, M. . Korovushkin // J. Phys. Soc. Jpn. - 2011. - Vol. 80, Is. 1. - Ст. 14703. - P., DOI 10.1143/JPSJ.80.014703. - Cited References: 36. - This study was supported by the program "Quantum Physics of Condensed Matter'' of the Presidium of the Russian Academy of Sciences (RAS), the Russian Foundation for Basic Research (project No. 10-02-00251), the Federal goal-oriented program Scientific Brainpower of the Russian Innovations 2009-2013, and the Siberian Division of RAS (Interdisciplinary Integration project No. 53). One of the authors (M. K.) would like to acknowledge the support of the Lavrentiev's Competition of the Siberian Division of RAS. The authors are grateful to the Physical Society of Japan for financial support in publication. . - ISSN 0031-9015

РУБ Physics, Multidisciplinary
Рубрики:
T-C SUPERCONDUCTOR
   EXTENDED HUBBARD-MODEL
   CUPRATE SUPERCONDUCTORS
   ELECTRON CORRELATIONS
   QUANTUM OSCILLATIONS
   FERMI-SURFACE
   OXIDES
   TEMPERATURE
   STATE
   BANDS
Кл.слова (ненормированные):
strongly correlated electron systems -- cuprate superconductors -- intersite Coulomb interaction -- t-V model -- de Haas-van Alphen effect -- Cuprate superconductors -- De Haas-van Alphen effect -- Intersite Coulomb interaction -- Strongly correlated electron systems -- T-V model
Аннотация: The effect of strong intersite Coulomb correlations on the formation of the electron structure of the t-V model has been studied. A qualitatively new result indicating the occurrence of a split-off band of Fermi states has been obtained. The spectral intensity of this band increases with an increase in doping level and is determined by the mean-square fluctuation of occupation numbers. This results in the transformation of the energy structure and the integrated density of states and in a further decrease in state occupation in the quasimomentum space near the Fermi level as compared with Hubbard renormalization. It has been shown that this effect leads to an increase in the area of the quasimomentum space part limited by the Fermi contour and is important for the analysis of the de Haas-van Alphen oscillations in cuprate superconductors.

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Держатели документа:
[Val'kov, Valery
Korovushkin, Maxim] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, Valery] Siberian Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
L. V. Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Siberian Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Вальков, Валерий Владимирович
}
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Pressure-induced spin transition and evolution of the electronic excitations of FeBO3: Resonant inelastic x-ray scattering results / J. Kim [et al.] // Europhys. Lett. - 2014. - Vol. 108, Is. 3. - Ст. 37001, DOI 10.1209/0295-5075/108/37001. - Cited References: 47. - High-pressure work was supported by DOE under Contract No. DE-FG02-02ER45955. The use of the Advanced Photon Source at the Argonne National Laboratory was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357. SGO and YuO acknowledge the President of Russia Grants NSh-1044.2012.2 and MK-1168.2012.2, the Presidium of the Russian Academy of Sciences Program 2, RFFI Grants 12-02-90410 and 12-02-31543, FCP GK-P891, and the Siberian Federal University Grant F11. AGG acknowledges support from the Russian Foundation for Basic Research grants 14-02-00483 and 15-02-03770 from RAS programs "Strongly correlated electron systems", "Elementary particle physics, fundamental nuclear physics and nuclear technologies". . - ISSN 0295-5075. - ISSN 1286-4854

РУБ Physics, Multidisciplinary
Рубрики:
LOWER-MANTLE
   SPECTRA
   STATE
   EMISSION
   COLLAPSE
   SYSTEMS
   OXIDES
   METAL
Аннотация: A high-pressure resonant inelastic x-ray scattering (RIXS) of FeBO3 at the Fe K pre-edge has been carried out to study the evolution of electronic excitations through the pressure-induced spin transition. Systematic peak shifts with insignificant peak width change are observed with increasing pressure in the high-spin state. An electronic transition occurs in tandem with the high-spin to low-spin transition, observed as the emergence of multiple new low-energy peaks in the spectra. The energy gap is reduced due to these low-energy peaks, not a peak width broadening. The observed electronic excitations are associated with dd excitations, which are calculated using a full-multiplet theory. We consider changes in crystal-field splitting and covalency to explain the observed peak shifts in the high-spin state. The new peaks that emerge upon the high- to low-spin transition are compared with dd excitations for the low-spin configuration. Copyright (C) EPLA, 2014

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Держатели документа:
Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci Troitsk, Inst Nucl Res, Moscow 142190, Russia
Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
Carnegie Inst Sci, HPCAT, Argonne, IL 60439 USA

Доп.точки доступа:
Kim, J.; Struzhkin, V. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Shvyd'ko, Y.; Upton, M. H.; Casa, D.; Gavriliuk, A. G.; Sinogeikin, S. V.; DOE [DE-FG02-02ER45955]; U.S. DOE [DE-AC02-06CH11357]; President of Russia Grants [NSh-1044.2012.2, MK-1168.2012.2]; Presidium of the Russian Academy of Sciences Program 2, RFFI [12-02-90410, 12-02-31543]; Siberian Federal University Grant [F11]; Russian Foundation for Basic Research grants from RAS programs [14-0200483, 15-02-03770]; FCP [GK-P891]
}
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Prediction of the in-gap states above the top of the valence band in undoped insulating cuprates due to the spin-polaron effect / S. G. Ovchinnikov [et al.] // J. Phys.: Condens. Matter. - 2004. - Vol. 16, Is. 8. - P. L93-L100, DOI 10.1088/0953-8984/16/8/L04. - Cited References: 25 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
ELECTRONIC-STRUCTURE
   LA2-XSRXCUO4
   MODEL
   ANTIFERROMAGNETISM
   SPECTRA
   OXIDES
Кл.слова (ненормированные):
Quasiparticle band structure -- Spin-polaron effect -- Antiferromagnetic materials -- Approximation theory -- Doping (additives) -- Electronic structure -- Hamiltonians -- Insulation -- Magnetic fields -- Strontium compounds -- Thermal effects -- Lanthanum compounds
Аннотация: In the framework of the generalized tight binding method we have calculated the quasiparticle band structure and the spectral functions of the undoped cuprates such as La2CuO4, Sr2CUO2Cl2 etc. Due to spin fluctuations the in-gap state appears above the top of the valence band in the undoped antiferromagnetic insulator similar to in-gap states induced by hole doping. In the ARPES experiments the in-gap states can be detected as weak low energy satellites.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Branch, Russian Academy of Science, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Borisov, A. A.; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Korshunov, M. M.; Коршунов, Максим Михайлович
}
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10.

Phase transformation behavior of Sr0.8Gd0.2CoO3-delta perovskite in the vicinity of order-disorder transition / S. N. Vereshchagin [et al.] // Thermochim. Acta. - 2017. - Vol. 655. - P. 34-41, DOI 10.10164/j.tca.2017.06.003. - Cited References:40. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project #16-43-240505 p_a and #16-02-00507A. . - ISSN 0040-6031. - ISSN 1872-762X

РУБ Thermodynamics + Chemistry, Analytical + Chemistry, Physical
Рубрики:
OXYGEN SORPTION
   OXIDES
   PERFORMANCE
   DIFFUSE
   LN
Кл.слова (ненормированные):
Perovskite -- Ruddlesden-Popper phase -- Order-disorder -- Phase transition -- DSC
Аннотация: The phase transformation behavior of a single-phase tetragonal Sr0.8Gd0.2CoO3-δ (with ordered distribution of Sr2+/Gd3+ cations and anion vacancies) was investigated by TG–DSC and XRD at 1100–1473 K and oxygen partial pressure p(O2) from 1 to 5·104 Pa. The first-order smeared order-disorder (o-d) phase transition involving heat absorption was observed at about 1383 K under O2-Ar flow with p(O2) > 2.5 kPa. The crystal structure of the high-temperature phase was found to be cubic perovskite with disordered Sr2+/Gd3+ cations and anion vacancies. The temperature of o-d transition at p(O2) > 2.5 kPa was not influenced by the heating rate or oxygen partial pressure. It was shown that at p(O2) < 2.5 kPa the o-d transition gives rise to Sr0.8Gd0.2CoO3−δ decomposition to form CoO and Sr2.4Gd0.6Co2O7-δ − Ruddlesden-Popper type phase with novel composition. The phase boundaries between the ordered tetragonal Sr0.8Gd0.2CoO3−δ, disordered cubic Sr0.8Gd0.2CoO3−δ and CoO + Sr2.4Gd0.6Co2O7-δ composite as a function of temperature and p(O2) values were determined.

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Держатели документа:
Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia.
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Vereshchagin, S. N.; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Shishkina, N. N.; Solovyov, L. A.; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-43-240505 p_a, 16-02-00507A]
}
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11.

Beznosikov, B. V.
Perovskite-like crystals of the Ruddlesden-Popper series / B. V. Beznosikov, K. S. Aleksandrov // Crystallogr. Rep. - 2000. - Vol. 45, Is. 5. - P. 792-798, DOI 10.1134/1.1312923. - Cited References: 28 . - ISSN 1063-7745

РУБ Crystallography
Рубрики:
CUPRATE
OXIDES
Аннотация: The layer perovskite-like structures of the so-called Ruddlesden-Popper phases have been analyzed in terms of crystal chemistry. The geometrical boundaries of the existence ranges of these compounds with multilayer stacks are determined and new phases of this type are predicted. The possible variants of related structures are also considered. (C) 2000 MAIK "Nauka/Interperiodica".

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Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Безносиков, Борис Валерьевич
}
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12.

Avramov, P. V.
Non-diagram transitions in polarized X-ray absorption CuL(3) spectra of HTSC-ceramics / P. V. Avramov, S. G. Ovchinnikov // Fiz. Tverd. Tela. - 1996. - Vol. 38, Is. 11. - P. 3226-3240. - Cited References: 28 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TC SUPERCONDUCTIVITY
   LA2CUO4
   ALPHA
   SATELLITES
   STATES
   OXIDES
   XANES

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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13.

New method for regulating the activity of ABO3 perovskite catalysts / S. N. Vereshchagin [et al.] // Kinet. Catal. - 2015. - Vol. 56, Is. 5. - P. 640-645, DOI 10.1134/S0023158415040199. - Cited References:23. - This work was supported in part by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (grant no. NSh-2886.2014.2). . - ISSN 0023. - ISSN 1608-3210. -

РУБ Chemistry, Physical
Рубрики:
MEMBRANE REACTORS
   METHANE COMBUSTION
   OXIDATION
   OXIDES
   OXYGEN
   PERFORMANCE
   FEATURES
   PHASES
   CO
Кл.слова (ненормированные):
perovskite -- cobalt -- methane -- deep oxidation -- oxidative condensation
Аннотация: A new possibility of changing the activity and selectivity of perovskite catalysts in the oxidative conversion of methane was demonstrated using the Sr x Gd1–x CoO3–δ (0.5 < x < 0.9) compounds as an example. It was established that, at the same chemical composition, the disordering of Sr2+/Gd3+ ions over the A positions of the crystal structure led to a significant increase in activity in the deep oxidation reaction of CH4, as compared with the samples with an ordered distribution of cations.

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Публикация на русском языке Новый способ регулирования активности катализаторов АВО3 со структурой перовскита [Текст] / С. Н. Верещагин [и др.] // Кинетика и катализ. - М. : Наука, 2015. - Т. 56 № 5. - С. 649-664

Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Vereshchagin, S. N.; Solov'ev, L. A.; Соловьев, Леонид Александрович; Rabchevskii, E. V.; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Anshits, A. G.; Аншиц, Александр Георгиевич; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [NSh-2886.2014.2]
}
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14.

    New hexagonal perovskite with Mn4+ and Mn5+ at distinct structural positions / N. V. Tarakina [et al.] // J. Phys.: Conf. Ser. - 2015. - Vol. 644. - Ст. UNSP 012004, DOI 10.1088/1742-6596/644/1/012004. - Cited References:13 . - ISSN 1742-6588
Рубрики:
MAGNETIC-PROPERTIES
   OXIDES
   PHASES
Аннотация: A new hexagonal perovskite, Ba7Li1.75Mn3.5O15.75, has been synthesised using microwave-assisted solid-state synthesis. Its crystal structure has elements typical for the layered hexagonal perovskites and quasi-one-dimensional oxides, hence representing a new polytype. Structural solution based on simultaneous refinement of X-ray and neutron diffraction data shows that Ba7Li1.75Mn3.5O15.75 crystallizes in a hexagonal unit cell with parameters a = 5.66274(2) Å and c = 16.7467(1) Å ( V = 465.063(4) Å3). Columns of face- shared octahedra occupied by Mn4+, Li+ cations and vacancies along the c axis are separated in the ab plane by barium atoms, so that every sixth layer, the coordination of Mn5+ and Li+ changes to tetrahedral. Separation of Mn4+ and Mn5+ cations in two distinct structural positions makes the structure unique. A scanning transmission electron microscopy study revealed the formation of a rhombohedrally centered supercell, which might be attributed to the ordering of manganese and lithium atoms among cationic sites.

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Доп.точки доступа:
Tarakina, N. V.; Tyutyunnik, A. P.; Bazuev, G. V.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Berger, I. F.; Gould, C.; Nikolaenko, I. V.; Electron Microscopy and Analysis Group Conference(2015 ; Jun 02-Jul 02 ; Manchester, England)
}
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15.

    Near-infrared luminescence and color tunable chromophores based on Cr3+-Doped Mullite-Type Bi2(Ga,Al)4O9 solid solutions / C. Liu [et al.] // Inorg. Chem. - 2015. - Vol. 54, Is. 4. - P. 1876-1882, DOI 10.1021/ic502779d. - Cited References: 26. - The present work was supported by the National Natural Science Foundations of China (Grants 51002146, 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306), and Fundamental Research Funds for the Central Universities (FRF-TP-14-005A1). . - ISSN 0020-1669
   Перевод заглавия: Ближняя инфракрасная люминесценция и перестраиваемые цвет хромофоры построенные на допированных Cr3+ твердых растворах Bi2(Ga,Al)4O9 со структурой муллита.

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
PERSISTENT LUMINESCENCE
   PHOSPHORS
   PIGMENT
   GARNET
   OXIDES
   FIELD
   RED
Аннотация: Cr3+-activated mullite-type Bi2Ga(4-x)AlxO9 (x = 0, 1, 2, 3, and 4) solid solutions were prepared by the solid state reaction, and their spectroscopic properties were investigated in conjunction with the structural evolution. Under excitation at 610 nm, Bi2[Ga(4-y)Aly]3.97O9:0.03Cr3+ (y = 0, 1, 2, 3, and 4) phosphors exhibited broad-band near-infrared (NIR) emission peaking at ?710 nm in the range 650?850 nm, and the optimum Cr3+ concentrations and concentration quenching mechanism were determined. Except for the interesting NIR emission, the body color changed from white (at x = 0) to green (at x = 0.08) for Bi2Ga4?xO9:xCr3+, and from light yellow (at x = 0) to deep brown (at x = 0.08) for Bi2Al4?xO9:xCr3+, respectively. Moreover, as a result of variable Al/Ga ratio, the observed body color for Bi2[Ga(4-y)Aly]3.97O9:0.03Cr3+ (y = 0, 1, 2, 3, and 4) varied from deep brown to green. The relationship between the observed colors and their diffuse reflectance spectra were also studied for the understanding of the different absorption bands. The results indicated that Cr3+-doped Bi2Ga(4-x)AlxO9 solid solutions appeared as the bifunctional materials with NIR phosphors and color-tunable pigments.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China.
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China.
RAS, SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Liu, C.; Xia, Zhiguo; Chen, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Q.
}
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16.

    Val'kov, V. V.
    Nature of Cooper instability of spin polarons in cuprate high-Tc superconductors / V. V. Val'kov, D. M. Dzebisashvili, A. F. Barabanov // J. Low Temp. Phys. - 2015. - Vol. 181, Is. 3-4. - P. 134-138, DOI 10.1007/s10909-015-1331-9. - Cited References:10. - This study was supported by the Russian Foundation for Basic Research, Projects Nos. 13-02-00523, 13-02-00909 and the Dynasty Foundation. . - ISSN 0022. - ISSN 1573-7357
   Перевод заглавия: Природа куперовской неустойчивости спиновых поляронов в купратных высокотемпературных сверхпроводниках

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
OXIDES
MODEL
Кл.слова (ненормированные):
High-T-c superconductors -- Spin polarons -- Spin-fermion model
Аннотация: It is shown that the exchange interaction in the subsystem of localized moments of copper ions can trigger a Cooper instability in the ensemble of spin-polaron quasiparticles in cuprate high-temperature superconductors. It is important that, inherent to cuprates, strong coupling between Fermi and spin degrees of freedom leads on the one hand to formation of spin-polaron quasiparticles and, on the other hand, allows to transfer the interaction between Bose degrees of freedom onto the interaction between Fermi quasiparticles. The solution of the integral equation for the d-wave superconducting order parameter is well consistent with the available experimental data.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia.
MF Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.
Russian Acad Sci, Inst High Pressure Phys, Troitsk 142092, Moscow Region, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [13-02-00523, 13-02-00909]; Dynasty Foundation
}
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17.

Mossbauer studies of FexMn1-xS single crystals / G. M. Abramova [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 2. - P. 237-240, DOI 10.1134/S1063783408020042. - Cited References: 16 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
METAL-INSULATOR-TRANSITION
   MAGNETIC-PROPERTIES
   ALPHA-MNS
   SULFIDES
   MAGNETORESISTANCE
   PRESSURE
   SYSTEM
   OXIDES
Аннотация: Single crystals of iron manganese sulfides FexMn1-xS (0.25

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Держатели документа:
[Abramova, G. M.
Petrakovskii, G. A.
Bayukov, O. A.
Bovina, A. F.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Varnek, V. A.
Sokolov, V. V.] Russian Acad Sci, Siberian Branch, Nikolaev Inst Inorgan Chem, Novosibirsk 630090, Russia
ИФ СО РАН

Доп.точки доступа:
Abramova, G. M.; Абрамова, Галина Михайловна; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bayukov, O. A.; Баюков, Олег Артемьевич; Varnek, V. A.; Sokolov, V. V.; Bovina, A. F.; Бовина, Ася Федоровна
}
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18.

Methane oxidation over A-site ordered and disordered Sr0.8Gd0.2CoO3−δ perovskites / S. N. Vereshchagin [et al.] // Chem. Commun. - 2014. - Vol. 50, Is. 46. - P. 6112-6115, DOI 10.1039/c4cc00913d. - Cited References: 20. - The authors acknowledge the financial support from SB RAS project N 38 (2012) and RFBR grant 13-02-00358. . - ISSN 1359-7345. - ISSN 1364-548X

РУБ Chemistry, Multidisciplinary
Рубрики:
MEMBRANE REACTORS
   OXYGEN
   OXIDES
   PERFORMANCE
   COMBUSTION
   FEATURES
   PHASES
Аннотация: A tetragonal phase Sr0.8Gd0.2CoO3−δ with ordered Gd3+/Sr2+ ions and oxygen vacancy sites is found to be about five times less active in the reaction of methane combustion than a quenched cubic perovskite phase with randomly distributed (disordered) Gd3+/Sr2+ ions over the A-sites of the crystal lattice.

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Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Vereshchagin, S. N.; Solovyov, L. A.; Соловьев, Леонид Александрович; Rabchevskii, E. V.; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Anshits, A. G.; Аншиц, Александр Георгиевич; SB RAS project [38]; RFBR [13-02-00358]
}
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19.

High-temperature heat capacity of Y2.93Ho0.07Fe5O12 / V. M. Denisov [et al.] // Phys. Solid State. - 2012. - Vol. 54, Is. 11. - P. 2205-2207, DOI 10.1134/S1063783412110078. - Cited References: 28 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PHYSICAL-PROPERTIES
SYSTEM
OXIDES
Аннотация: This paper presents data on the heat capacity of Y2.93Ho0.07Fe5O12 obtained in the temperature range 343-1000 K. A correlation between the composition of the Fe2O3-Y2O3 pseudobinary system and the specific heat capacity of oxide compounds is pointed out.

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Публикация на русском языке Высокотемпературная теплоемкость Y2.93Ho0.07Fe5O12 // Физика твердого тела : Издательство "Наука", 2012. - Т. 54, N 11. - С. 2073-2075. - ISSN 0367-3294

Держатели документа:
Denisov, V. M.
Denisova, L. T.
Irtyugo, L. A.
Chumilina, L. G.] Siberian Fed Univ, Inst Nonferrous Met & Mat Sci, Krasnoyarsk 660025, Russia
Patrin, G. S.
Volkov, N. V.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Denisov, V. M.; Denisova, L. T.; Irtyugo, L. A.; Patrin, G. S.; Патрин, Геннадий Семёнович; Volkov, N. V.; Волков, Никита Валентинович; Chumilina, L. G.
}
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20.

High-temperature heat capacity of copper metaborate CuB2O4 / V. M. Denisov [et al.] // Phys. Solid State. - 2012. - Vol. 54, Is. 10. - P. 2142-2144, DOI 10.1134/S1063783412100113. - Cited References: 17 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SINGLE-CRYSTALS
   MAGNETIC-PROPERTIES
   SYSTEM
   OXIDES
Аннотация: The heat capacity of copper metaborate CuB2O4 has been measured over a wide temperature range. A correlation between the composition of the CuO-B2O3 system and the heat capacity of the oxide compounds has been found.

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Публикация на русском языке Высокотемпературная теплоемкость метабората меди CuB2O4 // Физика твердого тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54, № 10. - С. 2012-2014. - ISSN 0367-3294

Держатели документа:
[Denisov, V. M.
Denisova, L. T.
Irtyugo, L. A.
Chumilina, L. G.] Siberian Fed Univ, Inst Nonferrous Met & Mat Sci, Krasnoyarsk 660025, Russia
[Volkov, N. V.
Patrin, G. S.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Volkov, N. V.
Patrin, G. S.] Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Denisov, V. M.; Denisova, L. T.; Irtyugo, L. A.; Volkov, N. V.; Волков, Никита Валентинович; Patrin, G. S.; Патрин, Геннадий Семёнович; Chumilina, L. G.
}
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