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Ovchinnikov, S. G.
Сomparison between the band structures of La2CuO4 and Nd2CuO4 / S. G. Ovchinnikov // Zhurnal Eksperimentalnoi Teor. Fiz. - 1992. - Vol. 102, Is. 1. - P. 127-131. - Cited References: 6 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRONIC-STRUCTURE
Аннотация: The band structure of quasiparticles in undoped La2CuO4 and Nd2CuO4 dielectric compounds is calculated involving the strong electron correlations in the generalized tight-binding method. In both compounds the dielectric gap is determined mainly by the charge-transfer processes. The reduction of the gap during the La-to-Nd transition is described by decreasing the parameter delta=epsilon(p)-epsilon(d) under the fixed other parameters of the theory, epsilon(p) and epsilon(d) being the energies of the single-particle states of p- and d-holes.

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Доп.точки доступа:
Овчинников, Сергей Геннадьевич
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    Weak antiferromagnet iron borate FeBO3. classical object for magnetism and the state of the art / S. G. Ovchinnikov, V. V. Rudenko, N. V. Kazak [et al.] // J. Exp. Theor. Phys. - 2020. - Vol. 131, Is. 1. - P. 177-188, DOI 10.1134/S106377612007016X. - Cited References: 74. - This work was supported by the Russian Science Foundation, project no. 18-12-00022 . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
ELECTRONIC-STRUCTURE
   TRANSITION
   RESONANCE
   FERROMAGNETISM
   DEPENDENCE
Аннотация: The simple lattice and magnetic structure, the high Neel temperature, the narrow antiferromagnetic resonance line of FeBO3, and the narrow electron paramagnetic resonance line of its isostructural diamagnetic analogs MBO3:Fe3+(M = Ga, In, Sc, Lu) make iron borate unique for investigations and applications. Iron borate is a model crystal for numerous experimental and theoretical studies, including spin crossovers and metallization at megabar pressures and many-electron effects in optics and X-ray spectroscopy. The recent works dealing with the investigation of the properties of FeBO(3)are reviewed.

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Публикация на русском языке Слабый ферромагнетик борат железа FeBO3. Классический объект для магнетизма и современное состояние исследований [Текст] / С. Г. Овчинников, В. В. Руденко, Н. В. Казак [и др.] // Журн. эксперим. и теор. физ. - 2020. - Т. 158 Вып. 1. - С. 184-197

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Kazak, N. V.; Казак, Наталья Валерьевна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Russian Science FoundationRussian Science Foundation (RSF) [18-12-00022]
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Ovchinnikov, S. G.
Symmetry of holes in high-temperature superconductors / S. G. Ovchinnikov // Solid State Commun. - 1991. - Vol. 77, Is. 3. - P. 221-224, DOI 10.1016/0038-1098(91)90336-T. - Cited References: 19 . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
FERMI-LIQUID STATES
   X-RAY ABSORPTION
   ELECTRONIC-STRUCTURE
   PHOTOEMISSION
   BI2SR2CACU2O8
   BISMUTH
Аннотация: A symmetry of holes is investigated in the multielectron band theory which takes into account strong correlations. It is shown that a small number of d(z2) states appears near the Fermi level due to d(z2) Cu-2p(x(y))O charge transfer as admixture to d(x2-y2)-p(x(y)) bands with dominant contribution of O2p states. The results are in a qualitative agreement with polarized photoemission data.

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Держатели документа:
L.V. Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
ИФ СО РАН

Доп.точки доступа:
Овчинников, Сергей Геннадьевич
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    Structure and optical properties of the Li2In2GeSe6 crystal / A. P. Yelisseyev [et al.] // J. Phys. Chem. C. - 2018. - Vol. 122, Is. 30. - P. 17413-17422, DOI 10.1021/acs.jpcc.8b02799. - Cited References: 49. - This work was supported by state assignment project #0330-2016-0008 and partly by the Russian Foundation of Basic Research (grants nos. 15-02-03408a, 17-45-540775r_a, and 17-52-53031), National Scientific Foundations of China (grants 11474292, 51702330, 11611530680, 91622118, and 91622124), the special foundation of the director of Technical Institute of Physics and Chemistry (TIPC), the China "863" project (no. 2015AA034203), and the Youth Innovation Promotion Association, CAS (outstanding member for Z.L. and grant 2017035 for X.J.). . - ISSN 1932-7447
   Перевод заглавия: Структура и оптические свойства в кристалле Li2In2GeSe6

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
PHASE-MATCHING PROPERTIES
TEMPERATURE-DEPENDENCE
ELECTRONIC-STRUCTURE
Аннотация: Intense search for new nonlinear optical crystals for the mid-infrared region is in progress, and Li-containing quaternary chalcogenides are expected to improve transparency range, stability, phase-matching conditions, and other parameters in comparison with commercially available AgGaS2, AgGaSe2, and ZnGeP2. Single crystals of Li2In2GeSe6 up to 8 mm in size were obtained by the Bridgman- Stockbarger growth technique, and their high quality was confirmed by exciton luminescence. A monoclinic structure and direct band-to-band electronic transitions were established, and the thermal expansion was shown to be virtually isotropic. Defect-related absorption and luminescence were revealed, and the way to lower them was suggested. The electronic structure, density of states, and some optical properties were calculated from the first principles for Li2In2GeSe6. The calculated nonlinear coefficients and rather large birefringence indicate a strong phase-matching ability. These investigations demonstrate that Li2In2GeSe6 is a promising mid-infrared nonlinear optical crystal.

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Держатели документа:
RAS, Sobolev Inst Geol & Mineral, 3 Ac Koptyug Ave, Novosibirsk 630090, Russia.
Novosibirsk State Univ, 2 Pyrogova St, Novosibirsk 630090, Russia.
RAS, SB, KSC, Lab Crystal Phys,Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China.
Univ Chinese Acad Sci, Beijing 100190, Peoples R China.

Доп.точки доступа:
Yelisseyev, A. P.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Jiang, Xingxing; Krinitsin, P. G.; Isaenko, L. I.; Lin, Zheshuai; Russian Foundation of Basic Research [15-02-03408a, 17-45-540775r_a, 17-52-53031]; National Scientific Foundations of China [11474292, 51702330, 11611530680, 91622118, 91622124]; special foundation of the director of Technical Institute of Physics and Chemistry (TIPC); China "863" project [2015AA034203]; Youth Innovation Promotion Association, CAS [2017035]; [0330-2016-0008]
}
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Strong spin triplet contribution of the first removal state in the insulating regime of Bi2Sr2Ca1-xYxCu2O8+delta / C. . Janowitz [et al.] // JETP Letters. - 2004. - Vol. 80, Is. 11. - P. 692-696, DOI 10.1134/1.1862796. - Cited References: 18 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRONIC-STRUCTURE
   APICAL OXYGEN
   MODEL
   SUPERCONDUCTIVITY
   ONSET
Аннотация: The experimental dispersion of the first removal state in the insulating Bi2Sr2Ca1 - xYxCu2O8 + delta regime is found to differ significantly from that of other parent materials: oxyclorides and La2CuO4. For Y contents of 0.92 greater than or equal to x greater than or equal to 0.55 due to nonstoichiometric effects in the Bi-O layers, the hole concentration in the CuO2 layers is almost constant and, on the contrary, the crystal lattice parameters a, b, c change very strongly. This (a, b) parameter increase and c parameter decrease results in an unconventional three peak structure at (0, 0), (pi/2, pi/2), (pi, pi) for x = 0.92. We can describe the experimental data only beyond the framework of the three-band p-d-model involving the representations of a new triplet counterpart for the Zhang-Rice singlet state. (C) 2004 MAIK "Nauka/Interperiodica".

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Держатели документа:
Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Physics, Humboldt University of Berlin, 12489 Berlin, Germany
Kirensky Institute of Physics, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Janowitz, C.; Seidel, U.; Unger, RST; Krapf, A.; Manzke, R.; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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Volkov, N. V.
Spintronics: manganite-based magnetic tunnel structures / N. V. Volkov // Phys. Usp. - 2012. - Vol. 55, Is. 3. - P. 250-269, DOI 10.3367/UFNe.0182.201203b.0263. - Cited References: 91. - This work was supported by the Russian Foundation for Basic Research (grant No. 11-02-00367-a); the program of the Presidium of the RAS, Fundamental Research on Nanotechnologies and Nanomaterials (grant No. 21.1); the program of the Department of Physical Sciences of the RAS "Spin Phenomena in Solid Nanostructures and Spintronics" (grant No. 2.4.4.1); integration projects of the Siberian Branch, RAS, Nos 5 and 134; and the Federal Special Purpose Program "Scientific and Pedagogical Personnel of Innovative Russia" (state contract No. NK-556P_15). . - ISSN 1063-7869

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-FREQUENCY RECTIFICATION
   THIN INSULATING FILM
   COLOSSAL MAGNETORESISTANCE
   GIANT MAGNETORESISTANCE
   ELECTRONIC-STRUCTURE
   SANDWICH STRUCTURES
   SPIN POLARIZATION
   IDENTICAL METALS
   PHASE-SEPARATION
   ROOM-TEMPERATURE
Аннотация: A topical and highly promising aspect of the field of spintronics is the physics involved in the flow of a spin-polarized current through magnetic tunnel structures. This review focuses on manganite-based structures, which are appealing for their high Curie temperature, highly spin-polarized conduction electrons, high chemical stability, and well-developed fabrication technology. Particular emphasis is placed on some novel approaches to studying the tunnel structures, including the use of planar geometry and the application of combined external factors (microwave and optical radiation) to investigate spin-polarized transport.

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Публикация на русском языке

Доп.точки доступа:
Волков, Никита Валентинович
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Specific features of spin, charge, and orbital ordering in cobaltites / N. B. Ivanova [et al.] // Phys. Usp. - 2009. - Vol. 52, Is. 8. - P. 789-810, DOI 10.3367/UFNe.0179.200908b.0837. - Cited References: 278. - This work was financially supported by the RFBR (projects 09-02-00171-a, 07-02-00226, and 09-02-00127), the Federal Agency of Science and Innovation (grant MK-4278.2008.2), and the Presidium of the Russian Academy of Sciences Program No. 5, Quantum Physics of Condensed Media (project No. 7). I.M.E.'s work was supported by the program for Leading Science Schools of the Ministry of Education and Science of the Russian Federation (grant 2.1.1/3199). . - ISSN 1063-7869

РУБ Physics, Multidisciplinary
Рубрики:
PEROVSKITE-TYPE OXIDES
   METAL-INSULATOR-TRANSITION
   HIGH-TEMPERATURE SUPERCONDUCTIVITY
   ONE-DIMENSIONAL CA3CO2O6
   ELECTRONIC-STRUCTURE
   MAGNETIC-PROPERTIES
   TRANSPORT-PROPERTIES
   STATE TRANSITION
   FUEL-CELLS
   CRYSTAL-STRUCTURE
Кл.слова (ненормированные):
Cobalt oxides -- Lanthanides -- Orbital degrees of freedom -- Orbital ordering -- Quasi-one-dimensional -- Spin state -- Superconducting compounds -- Theoretical result -- Calcium -- Cobalt -- Lanthanum -- Oxide minerals -- Perovskite -- Spin dynamics -- Superconductivity -- Cobalt compounds
Аннотация: Complex cobalt oxides known as cobaltites are reviewed, including LnCoO(3)-based perovskite-structured rare-earth cobaltites (where Ln is lanthanum or a lanthanide), quasi-two-dimensional and quasi-one-dimensional cobaltites of the types LnCo(2)O(5+delta), La2CoO4, and Ca3Co2O8, and NaxCoO2 center dot yH(2)O superconducting compounds. Key experimental and theoretical results are presented, with emphasis on the interplay between charge, spin, and orbital degrees of freedom. Two problems of specific relevance to cobaltites - the spin state instability of Co3+ ions in LnCoO(3), and the nature of superconductivity in NaxCoO2 center dot yH(2)O - are also given significant attention.

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Держатели документа:
[Ivanova, N. B.
Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660074, Russia
[Ovchinnikov, S. G.
Korshunov, M. M.
Kazak, N. V.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Korshunov, M. M.
Eremin, I. M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Eremin, I. M.] Kazan VI Lenin State Univ, Kazan 420008, Russia
ИФ СО РАН
Siberian Federal University, ul. Kirenskogo 26, 660074 Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50-38, 660036 Krasnoyarsk, Russian Federation
Max-Planck-Institut FuE R Physik Komplexer Systeme, NoE thnitzer Straue 38, D-01187 Dresden, Germany
Kazan State University, ul. Kremlevskaya 18, 420008 Kazan, Russian Federation

Доп.точки доступа:
Ivanova, N. B.; Иванова, Наталья Борисовна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Eremin, I. M.; Kazak, N. V.; Казак, Наталья Валерьевна; RFBR [09-02-00171-a, 07-02-00226, 09-02-00127]; Federal Agency of Science and Innovation [MK-4278.2008.2]; Presidium of the Russian Academy of Sciences [5, 7]; Leading Science Schools of the Ministry of Education and Science of the Russian Federation [2.1.1/3199]
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    Pressure-stimulated synthesis and luminescence properties of microcrystalline (Lu,Y)3Al5O12:Ce3+ garnet phosphors / V. V. Atuchin [et al.] // ACS Appl. Mater. Interfaces. - 2015. - Vol. 7, Is. 47. - P. 26235-26243, DOI 10.1021/acsami.5b08411. - Cited References: 75. - This work was partly supported by the National Natural Science Foundations of China (Grant Nos. 51272242 and 51511130035) and the Russian Foundation for Basic Research (Grant No. 15-52-53080 GFEN_a). V.V.A. was partly supported by the Ministry of Education and Science of the Russian Federation . - ISSN 1944-8244
   Перевод заглавия: Синтез стимулированный давлением и люминесцентные свойства микрокристаллических гранатов (Lu,Y)3Al5O12:Ce3+

РУБ Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
LASER MASS-SPECTROMETRY
   LIGHT-EMITTING-DIODES
   WHITE-LIGHT
   SINGLE-CRYSTALS
   OPTICAL-PROPERTIES
   ELECTRONIC-STRUCTURE
   VIBRATIONAL PROPERTIES
   PHASE-TRANSITIONS
   PARTICLE-SIZE
   GROWTH
Кл.слова (ненормированные):
synthesis -- pressure -- garnet -- structure -- luminescence -- phosphor
Аннотация: The Lu2.98Ce0.01Y0.01Al5O12 and Y2.99Ce0.01Al5O12 phosphors were synthesized by solid state reaction at temperature 1623 K and pressure 1.5 × 107 Pa in (95% N2 + 5% H2) atmosphere. Under the conditions, the compounds crystallize in the form of isolated euhedral partly faceted microcrystals ∼19 μm in size. The crystal structures of the Lu2.98Ce0.01Y0.01Al5O12 and Y2.99Ce0.01Al5O12 garnets have been obtained by Rietveld analysis. The photoluminescence (PL) and X-ray excited luminescence (XL) spectra obtained at room temperature indicate broad asymmetric bands with maxima near 519 and 540 nm for Y2.99Ce0.01Al5O12 and Lu2.98Ce0.01Y0.01Al5O12, respectively. The light source was fabricated using the powder Lu2.98Ce0.01Y0.01Al5O12 phosphor and commercial blue-emitting n-UV LED chips (λex = 450 nm). It is found that the CIE chromaticity coordinates are (x = 0.388, y = 0.563) with the warm white light emission correlated color temperature (CCT) of 6400 K and good luminous efficiency of 110 lm/W. © 2015 American Chemical Society.

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Держатели документа:
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russian Federation
Functional Electronics Laboratory, Tomsk State University, Tomsk, Russian Federation
Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk, Russian Federation
Analytical Laboratory, Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russian Federation
Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russian Federation
Department of Applied Physics, Novosibirsk State University, Novosibirsk, Russian Federation
Laboratory of Crystal Physics, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Laboratory of High Pressure Minerals and Diamond Deposits, Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russian Federation
School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, China

Доп.точки доступа:
Atuchin, V. V.; Beisel, N. F.; Galashov, E. N.; Mandrik, E. M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Yelisseyev, A. P.; Yusuf, A. A.; Xia, Z.
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    Preparation and characterization of colloidal copper xanthate nanoparticles / Y. Mikhlin [et al.] // New J. Chem. - 2016. - Vol. 40, Is. 4. - P. 3059-3065, DOI 10.1039/c6nj00098c. - Cited References:50. - This research was supported by the Russian Science Foundation grant 14-17-00280. We thank Dr Roberto Felix Duarte (HZB) and bilateral program "German-Russian laboratory at BESSY II" for assistance with the X-ray absorption experiments. . - ISSN 1144-0546. - ISSN 1369-9261
   Перевод заглавия: Получение и исследование коллоидных наночастиц ксантогената меди

РУБ Chemistry, Multidisciplinary
Рубрики:
X-ray-absorption
   Self-assembled monolayers
   Sulfide nanoparticles
   Electronic-structure
   Waste-water
   Complexes
   Flotation
   Spectroscopy
   Adsorption
   Oxidation
Аннотация: Despite the important role of metal xanthates in a number of industrial processes and emerging applications, no attempts have been made to prepare the metal xanthate nanoparticles and to study colloidal solutions of insoluble heavy metal xanthates. Here, we examined the formation of colloidal copper xanthate particles during the reactions of aqueous solutions of cupric sulfate and various potassium xanthates, which occur in flotation and water treatment slurries and can be used to manufacture nanoparticles for materials science (e.g., as precursors for copper sulfide nanoparticles and biomedicine). The products were characterized using UV-vis absorption, dynamic light scattering, zeta potential measurements, transmission electron microscopy (TEM), electron diffraction, Fourier transform infrared spectroscopy, thermogravimetry, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy (XANES). Colloidal copper xanthates with compositions of ROCSSCu (R = ethyl, isopropyl, butyl, isobutyl, and amyl groups), disordered structures and average diameters of 20–80 nm easily formed and aggregated and were stable for at least several hours, especially if excessive xanthate was used. The hydrodynamic diameters of the nanoparticles were smaller at lower temperatures. Dixanthogens, which were produced in the reactions along with ROCSSCu, seemed to promote nanoparticle aggregation and precipitated with the copper xanthate, affecting their thermal decomposition. The TEM micrographs and S K- and Cu K-edge XANES spectra revealed core/shell particle morphologies, likely with Cu(I) bonded to four S atoms in the core and reduced copper coordination in the shell.

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Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Akad 50-24, Krasnoyarsk 6600036, Russia.
Siberian Fed Univ, Svobodny Pr 79, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Akad 50-38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Mikhlin, Y. L.; Михлин, Юрий Леонидович; Vorobyev, S.; Saikova, S. V.; Сайкова, С. В.; Tomashevich, Y.; Fetisova, O.; Kozlova, S.; Zharkov, S. M.; Жарков, Сергей Михайлович; Russian Science Foundation [14-17-00280]
}
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10.

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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