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GEKHT, R. S.
MAGNETIC TRANSITION FROM INCOMMENSURABLE TO COMMENSURABLE INTERMEDIATE PHASE AND LOW-TEMPERATURE SPIN CORRELATIONS / R. S. GEKHT // Zhurnal Eksperimentalnoi Teor. Fiz. - 1987. - Vol. 93, Is. 1. - P. 255-265. - Cited References: 24 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary

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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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OVCHINNIKOV, S. G.
NOVEL MECHANISM FOR THE FORMATION OF IMPURITY LEVELS IN SEMICONDUCTORS WITH THE STRONG ELECTRON CORRELATIONS / S. G. OVCHINNIKOV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1992. - Vol. 102, Is. 2. - P. 534-540. - Cited References: 8 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary

Аннотация: In the framework of the generalized tight binding method involving the strong electron correlations it is shown that in spite of the lattice regularity the impurity-like localized levels may arise within the semiconducting gap with the deviation of the electron concentration from the integer value. The appearance of these levels is due to the contribution of multi-electron excited terms into the single-particle density of states.

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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

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
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Ovchinnikov, S. G.
Effects of intense electron correlations on x-ray and x-ray electron copper spectra of high-temperature superconductors / S. G. Ovchinnikov, P. V. Avramov // Fiz. Tverd. Tela. - 1995. - Vol. 37, Is. 9. - P. 2559-2567. - Cited References: 22 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
HIGH-ENERGY SPECTROSCOPY
   HIGH-TC SUPERCONDUCTORS
   SATELLITES
   LA2CUO4
   OXIDES
   HOLES
   STATE

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Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Овчинников, Сергей Геннадьевич
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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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Sandalov, I.
From local-density approximation to strong electron correlations / I. . Sandalov, B. . Johansson, O. . Eriksson // Physica B. - 1999. - Vol. 259-61: International Conference on Strongly Correlated Electron Systems (SCES 98) (JUL 15-18, 1998, PARIS, FRANCE). - P. 229-230, DOI 10.1016/S0921-4526(98)00789-3. - Cited References: 4 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:

Кл.слова (ненормированные):
beyond LDA -- correlations -- diagram technique -- non-orthogonality
Аннотация: We formulate a regular approach for ab initio calculations of the band structure, ground state properties (T = 0 K) and excitations (T not equal 0) which goes beyond the local-density approximation (LDA) for systems with d- and f-electrons. A diagram technique for non-zero temperature both from the itinerant and atomic limits is developed within a non-orthogonal basis which is generated by the calculation in LDA. LDA is taken as a reference point. Local electron correlations are taken into account by exact transformation of total Hamiltonian to many-electron representation. The derived system of equations for Green's functions of coupled conduction and correlated electrons (including angular momenta, etc.) is presented in closed functional form which allows to construct accurately self-consistent approximations. The approach can be used also in particular cases of any non-commutative algebras,like different spin models with strong anisotropy, or models of correlated electrons (Hubbard, Anderson) for multiple on-site orbitals. (C) 1999 Elsevier Science B.V. All rights reserved.

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Держатели документа:
Univ Uppsala, Inst Phys, Condensed Matter Theory Grp, S-75121 Uppsala, Sweden
LV Kirensky Phys Inst, Krasnoyarsk 630036, Russia
ИФ СО РАН

Доп.точки доступа:
Johansson, B.; Eriksson, O.
}
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Aplesnin, S. S.
Quantum Monte Carlo investigation of the 2D Heisenberg model with S=1/2 / S. S. Aplesnin // Phys. Solid State. - 1999. - Vol. 41, Is. 1. - P. 103-107, DOI 10.1134/1.1130737. - Cited References: 33 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SQUARE-LATTICE
   GROUND-STATE
   SPIN-CORRELATIONS
   ANTIFERROMAGNET
   LA2CUO4
   EU2CUO4
   ENERGY
   ORDER
Аннотация: The two-dimensional (2D) Heisenberg model with anisotropic exchange (Delta=1-J(x)/J(z)) and S=1/2 is investigated by the quantum Monte Carlo method. The energy, susceptibility, specific heat, spin-spin correlation functions, and correlation radius are calculated. The sublattice magnetization (sigma) and the Neel temperature of the anisotropic antiferromagnet are logarithmic functions of the exchange anisotropy: 1/sigma + 1 + 0.13(1) ln(1/Delta). Crossover of the static magnetic structural factor as a function of temperature from power-law to exponential occurs for T(c)/J approximate to 0.4. The correlation radius can be approximated by 1/xi =2.05T(1.0(6))/exp(1.0(4)/ T). For La(2)CuO(4) the sublattice magnetization is calculated as sigma=0.45, the exchange is J=(1125=1305) K; for Er(2)CuO(4)J similar to 625 K and the exchange anisotropy Delta similar to 0.003. The temperature dependence of the static structural magnetic factor and the correlation radius above the Neel temperature in these compounds can be explained by the formation of topological excitations (spinons). (C) 1999 American Institute of Physics. [S1063-7834(99)02401-6].

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

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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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.

Fransson, J.
Effects of non-orthogonality and electron correlations on the time-dependent current through quantum dots / J. . Fransson, O. . Eriksson, I. . Sandalov // Phys. Rev. B. - 2002. - Vol. 66, Is. 19. - Ст. 195319, DOI 10.1103/PhysRevB.66.195319. - Cited References: 46 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
GREENS-FUNCTION APPROACH
   TUNNEL-JUNCTIONS
   LOCAL OXIDATION
   ANDERSON MODEL
   TRANSPORT
   NONORTHOGONALITY
   CONDUCTANCE
   EQUILIBRIUM
   TRANSISTOR
   IMPURITY
Аннотация: Three issues are analyzed in the physics of time-dependent tunneling current through a quantum dot with strongly correlated electrons coupled to two external contact leads: (i) nonorthogonality of the states of electrons in the leads and in the quantum dot, (ii) non-Fermi statistics of the excitations in the quantum dot, and iii) kinematic shift of the quantum dot levels. The contributions from nonorthogonality effectively decrease the mixing interaction between the leads and the quantum dot and the width of the quantum dot level whereas the Gibbs statistics slightly changes the spectral weights of quantum dot levels, and decreases the widths, but does not introduce drastical changes to the current. The kinematic interactions are taken into account within the loop correction. For the case of block signal, the time-dependent current shows oscillations starting at the onset and termination of the bias voltage pulse.

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Держатели документа:
Univ Uppsala, Condensed Matter Theory Grp, S-75121 Uppsala, Sweden
RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Eriksson, O.; Sandalov, I.
}
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11.

Study of magnetic correlations in nanostructured ferromagnets by correlation magnetometry / R. S. Iskhakov [et al.] // JETP Letters. - 2003. - Vol. 78, Is. 10. - P. 646-650, DOI 10.1134/1.1644310. - Cited References: 20 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
AMORPHOUS FERROMAGNETS
   RANDOM ANISOTROPY
   NANOCRYSTALLINE
   SYSTEM
   RIPPLE
Аннотация: We propose a theoretically justified experimental magnetometric technique for determining the size of stochastic domains spontaneously formed in the spin system of nanostructured ferromagnets and for evaluating the effective anisotropy in these magnetically correlated regions. The method is based on monitoring the DeltaM similar to H (-2) relationship in the low-field part of the integral magnetization curve. (C) 2003 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Ignatchenko, V. A.; Игнатченко, Вальтер Алексеевич; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Balaev, A. D.; Балаев, Александр Дмитриевич
}
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12.

Theory of spin filtering through quantum dots / J. . Fransson [et al.] // Phys. Rev. B. - 2003. - Vol. 67, Is. 20. - Ст. 205310, DOI 10.1103/PhysRevB.67.205310. - Cited References: 28 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
DEPENDENT TUNNELING JUNCTIONS
   NARROW ENERGY BANDS
   ELECTRON CORRELATIONS
   MAGNETORESISTANCE
   BARRIER
   POLARIZATION
Аннотация: Using a nonequilibrium diagram technique for Hubbard operator Green functions combined with a generalization of the transfer Hamiltonian formalism, we calculate the transport through a magnetic quantum dot system with spin-dependent couplings to the contacts. In specific regimes of the parameter space the spin-dependent tunnel current becomes more than 99.95% spin polarized, suggesting that a device thus constructed can be used in spin-filter applications. First-principles electronic structure calculations show the existence of nanostructured systems, such as, e.g., MgO/Fe/Pd(5)/Fe/MgO (001), with the desired properties in the direction of the current.

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Держатели документа:
Uppsala Univ, Dept Phys, S-75121 Uppsala, Sweden
RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Fransson, J.; Holmstrom, E.; Eriksson, O.; Sandalov, I.
}
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13.

Ovchinnikov, S. G.
Exotic superconductivity and magnetism in ruthenates / S. G. Ovchinnikov // Phys. Usp. - 2003. - Vol. 46, Is. 1. - P. 21-44, DOI 10.1070/PU2003v046n01ABEH001235. - Cited References: 167 . - ISSN 1063-7869

РУБ Physics, Multidisciplinary
Рубрики:
ITINERANT FERROMAGNET SRRUO3
   SPIN-TRIPLET SUPERCONDUCTIVITY
   STRONGLY CORRELATED ELECTRONS
   T-J-MODEL
   J-I-MODEL
   TRANSPORT-PROPERTIES
   MOTT-INSULATOR
   FERMI-SURFACE
   LAYERED PEROVSKITE
   RUTHENIUM OXIDES
Кл.слова (ненормированные):
Electronic structure -- Magnetic properties -- Magnetism -- Oxide superconductors -- Strontium alloys -- Superconductivity -- Electron correlations -- Ruthenates -- Rutheno-cuprates -- Spin-triplet pairing -- Ruthenium compounds
Аннотация: Basic experimental and theoretical results on ruthenates and rutheno-cuprates are reviewed. The electronic structure of various ruthenates and exotic superconductivity in Sr2RuO4 with spin-triplet pairing are described. The complex phase diagram of Ca2-xSrxRuO4, involving competing magnetic phases and metal-insulator transitions, is described, as are the exotic magnetic properties of Sr3Ru2O7 and of the double perovskite Sr2YRuO6, and the coexistence of superconductivity and magnetism in the rutheno-cuprate RuSr2GdCu2O8. Possible applications of Sr2RuO4 and SrRuO3 are considered. The effect of strong electron correlations is discussed, and the properties of ruthenates and cuprates are compared.

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Держатели документа:
Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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14.

Borisov, A. A.
Temperature and concentration dependences of the electronic structure of copper oxides in the generalized tight binding method / A. A. Borisov, V. A. Gavrichkov, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2003. - Vol. 97, Is. 4. - P. 773-780, DOI 10.1134/1.1625067. - Cited References: 25 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
SUPERCONDUCTING-GAP ANISOTROPY
   BAND-STRUCTURE
   FERMI-SURFACE
   NORMAL-STATE
   BI2SR2CACU2O8+DELTA
   EVOLUTION
Кл.слова (ненормированные):
Doping (additives) -- Electron transitions -- Electronic structure -- Fermi level -- Fermi surface -- Electron correlations -- Pseudogap -- Tight binding method -- Valence band -- Copper oxides
Аннотация: The electronic structure of p-type doped HTSC cuprates is calculated by explicitly taking into account strong electron correlations. The smooth evolution of the electronic structure from undoped antiferromagnetic to optimally and heavily doped paramagnetic compositions is traced. For a low doping level, in-gap impurity-type states are obtained, at which the Fermi level is pinned in the low-doping region. These states are separated by a pseudogap from the valence band. The Fermi surfaces calculated for the paramagnetic phase for various concentrations of holes are in good agreement with the results of ARPES experiments and indicate a gradual change in the Fermi surface from the hole type to the electron type. (C) 2003 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Борисов, Алексей Александрович. Температурная и концентрационная зависимости электронной структуры оксидов меди в обобщенном методе сильной связи [Текст] / А. А. Борисов, В. А. Гавричков, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 2003. - Т. 124 Вып. 4. - С. 862-870

Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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15.

Effective parameters of the band dispersion in n-type high-T-c superconductors / M. M. Korshunov [et al.] // Physica C. - 2004. - Vol. 402, Is. 4. - P. 365-370, DOI 10.1016/j.physc.2003.10.017. - Cited References: 32 . - ISSN 0921-4534

РУБ Physics, Applied
Рубрики:
DOPED CUPRATE SUPERCONDUCTORS
   TIGHT-BINDING METHOD
   QUASI-PARTICLES
   COPPER OXIDES
   LA2-XSRXCUO4
   SYMMETRY
   MODEL
   EVOLUTION
   ORDER
Кл.слова (ненормированные):
high-T-c superconductivity -- electronic correlations -- electron-doped cuprates -- Electron-doped cuprates -- Electronic correlations -- High-Tc superconductivity -- Approximation theory -- Atomic physics -- Band structure -- Binding energy -- Charge transfer -- Correlation methods -- Doping (additives) -- Electronic structure -- Hamiltonians -- Mathematical models -- Mathematical operators -- Oxide superconductors -- Perturbation techniques -- Photoelectron spectroscopy -- Atomic orbitals -- Conduction band -- Electron doped cuprates -- Electron spins -- Valence band -- High temperature superconductors
Аннотация: The electronic structure of electron-doped cuprates is discussed in the regions of small and optimal doping. For optimal doping we obtain the parameters from a simple tight-binding analysis by fitting ARPES data, and for small doping we study the band structure by the generalized tight-binding method that takes strong electronic correlations into account explicitly. This method has also reproduced well the ARPES data for small doping. The effective low-energy Hamiltonian is the t-t'-J model with hopping parameters t and t'. We compare both methods and find very good agreement for the value of t while t' is different because it is caused by the different contribution of the short-range spin correlations. (C) 2003 Elsevier B.V. All rights reserved.

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Держатели документа:
Free Univ Berlin, Inst Theoret Phys, D-14195 Berlin, Germany
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Science, Krasnoyarsk 660036, Russian Federation
Inst. fur Theoretische Physik, Freie Universitat Berlin, Arnimallee 14, D-14195 Berlin, Germany

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Manske, D.; Eremin, I.
}
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16.

Fransson, J.
A perfect spin-filter quantum dot system / J. . Fransson, I. . Sandalov, O. . Eriksson // J. Phys.: Condens. Matter. - 2004. - Vol. 16, Is. 16. - P. L249-L254, DOI 10.1088/0953-8984/16/16/L03. - Cited References: 39 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
NARROW ENERGY BANDS
   ELECTRON CORRELATIONS
   MAGNETIC-FIELD
   MAGNETOTRANSPORT
   CONDUCTANCE
   RESISTANCE
   BARRIER
   FORMULA
   VALVE
   LIMIT
Кл.слова (ненормированные):
Electric potential -- Electron tunneling -- Magnetic couplings -- Magnetic fields -- Magnetic filters -- Transport properties -- Electron correlations -- Magnetic contacts -- Source-drain voltage -- Spin projections -- Semiconductor quantum dots
Аннотация: The discovery of a novel effect in the transport through a QD spin-dependently coupled to magnetic contacts is reported. For a finite range of source-drain voltages the spin projections of the current cancel exactly, resulting in a completely suppressed output current. The spin down current behaves as one normally expects whereas the spin up current becomes negative. As the source-drain voltage is increased the spin up current eventually becomes positive. Thus, tuning the source-drain voltage such that the spin up current vanishes will result in a perfect spin filter.

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Держатели документа:
Royal Inst Technol, Dept Phys, KTH, SE-10691 Stockholm, Sweden
Univ Uppsala, Dept Phys, SE-75121 Uppsala, Sweden
RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Max Planck Inst Phys Complex Syst, D-01187 Dresden, Germany
ИФ СО РАН
Department of Physics, Royal Institute of Technology (KTH), SE-106 91 Stockholm, Sweden
Physics Department, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden
Kirensky Institute of Physics, RAS, 660036 Krasnoyarsk, Russian Federation
Max-Plank-Inst. Phys. Complex Sys., Nothnitzer Stra?e 38, 01187 Dresden, Germany
Dept. of Mat. Sci. and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden

Доп.точки доступа:
Sandalov, I.; Eriksson, O.
}
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17.

Ovchinnikov, S. G.
The energy band structure and optical spectra of FeBO3 calculated with allowance for strong electron correlations / S. G. Ovchinnikov, V. N. Zabluda // J. Exp. Theor. Phys. - 2004. - Vol. 98, Is. 1. - P. 135-143, DOI 10.1134/1.1648107. - Cited References: 32. - This study was supported by the Russian Foundation for Basic Research (project no. 03-02-16286) and by the “Strongly Correlated Electrons” Program of the Department of Physical Sciences of the Russian Academy of Sciences . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
PHASE-TRANSITION
   HIGH-PRESSURE
   FERROMAGNETISM
   MODEL
Кл.слова (ненормированные):
Atomic physics -- Band structure -- Charge transfer -- Excitons -- Green's function -- Light absorption -- Dielectric gap -- Energy band structure -- Lehmann spectral representation -- Optical spectra -- Iron compounds
Аннотация: A model of the energy band structure of iron borate (FeBO3) is proposed that combines a one-electron description of the sp states of boron and oxygen with a many-electron description of the d states of iron. The Green functions of d electrons are calculated using the exact Lehmann spectral representation. The energies of the d-type quasiparticles are calculated using terms of the d(4) , d(5) , and d(6) electron configurations. The optical absorption spectrum of FeBO3 is determined by local excitons and by the electron excitations with charge transfer. The latter excitations control the nature of the dielectric gap in FeBO3 crystals. The model parameters are determined from a comparison to the exciton energies. The density of single-particle states in FeBO3 is calculated. The main bands in the calculated optical absorption spectrum agree well with experimental data for energies up to 3 eV. (C) 2004 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Энергетическая структура и оптические спектры FeBO[3] с учетом сильных электронных корреляций [Текст] / С. Г. Овчинников, В. Н. Заблуда // Журн. эксперим. и теор. физ. - 2004. - Т. 125 Вып. 1. - С. 150-159

Держатели документа:
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Zabluda, V. N.; Заблуда, Владимир Николаевич; Овчинников, Сергей Геннадьевич
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18.

The mechanism of suppression of strong electron correlations in FeBO3 at high pressures / A. G. Gavriliuk [et al.] // J. Exp. Theor. Phys. - 2004. - Vol. 99, Is. 3. - P. 566-573, DOI 10.1134/1.1809686. - Cited References: 18 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
MAGNETIC COLLAPSE
   TRANSITION
   SPECTRA
   ABSORPTION
   STATE
Кл.слова (ненормированные):
Crystal structure -- High pressure effects -- Light absorption -- Parameter estimation -- Phase transitions -- Spectrum analysis -- Crystal field -- Electron correlations -- Generalized tight binding method -- Hybridization -- Iron compounds
Аннотация: The optical absorption spectra of iron borate (FeBO3) are measured at high pressures up to P = 82 GPa. A mechanism of suppression of strong electron correlations is proposed within the framework of the generalized tight binding method, which leads to the experimentally observed magnetic, electronic, and structural phase transitions. Taking into account peculiarities of the crystal structure of FeBO3 and the strong s-p hybridization of boron and oxygen, it is established that, as the distance between ions varies with increasing pressure, the crystal field parameter begins to play a decisive role in the electron transitions, while the influence of the d band broadening is negligibly small. Parameters of the theory are calculated as functions of the pressure. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Shubnikov Inst Crystall, Moscow, Russia
Russian Acad Sci, Inst High Pressure Phys, Troitsk 142092, Russia
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russian Federation
Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142092, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Gavriliuk, A. G.; Trojan, I. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Lyubutin, I. S.; Sarkisyan, V. A.
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19.

Komogortsev, S. V.
Magnetization curve and magnetic correlations in a nanochain of ferromagnetic grains with random anisotropy / S. V. Komogortsev, R. S. Iskhakov // Phys. Solid State. - 2005. - Vol. 47, Is. 3. - P. 495-501, DOI 10.1134/1.1884711. - Cited References: 31 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
NANOCRYSTALLINE FERROMAGNETS
   AMORPHOUS FERROMAGNETS
   FIELD
   MODEL
   MICROSTRUCTURE
   SIMULATIONS
   DEPENDENCE
   SYMMETRY
   SYSTEM
   MEDIA
Аннотация: The magnetization curve and magnetization correlation function are calculated for a ferromagnetic chain of single-domain nanoparticles with a randomly oriented anisotropy axis for different ratios between the exchange correlation and anisotropy energies. It is shown that the coercive force decreases as the exchange correlations increase. For strong exchange correlations, the magnetization curve is described by the following three successive magnetization processes as the applied field is increased: (i) nonuniform rotation of the magnetization of stochastic domains, (ii) collapse of the magnetic solitons, and (iii) nonuniform rotation of exchange-correlated magnetization vectors of the nanoparticles. For high fields, the calculated correlation function of the transverse magnetization components coincides with that predicted from linear theory. At low and zero fields, the main parameters of the correlation function (the variance and correlation radius) tend to certain finite values rather than diverge (as is the case in linear theory). The irreversible variation in the magnetization at low fields (the hysteresis loop) and the hysteresis of the main parameters of the correlation function are calculated. (c) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation

Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Комогорцев, Сергей Викторович
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20.

Ovchinnikov, S. G.
The mechanism of the electronic transition in ferroborates under high pressure / S. G. Ovchinnikov // J. Phys.: Condens. Matter. - 2005. - Vol. 17: 2nd International Symposium on Physics of Solids Under High Pressure Using Nuclear Probes (JUL 20-24, 2004, Cologne, GERMANY), Is. 11. - P. S743-S751, DOI 10.1088/0953-8984/17/11/003. - Cited References: 20 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
STRUCTURAL PHASE-TRANSITION
   MAGNETIC COLLAPSE
   OPTICAL-SPECTRA
   BAND-STRUCTURE
   FEBO3
   MODEL
Кл.слова (ненормированные):
Carrier concentration -- Correlation methods -- Electron transitions -- High pressure effects -- Magnetic moments -- Mathematical models -- Metal insulator transition -- Crystal field -- Electron correlations -- Electronic transition -- Ferroborates -- Ferromagnetic materials
Аннотация: A novel mechanism for the insulator-semiconductor transition and magnetic collapse in FeBO3 is proposed in the framework of the multielectron model with account taken of strong electron correlations. The electronic transition results from the crossover of the high spin and low spin Fe3+ states induced by the crystal field increasing with pressure. In the high pressure phase a semiconductor-metal transition is expected.

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

Доп.точки доступа:
Овчинников, Сергей Геннадьевич
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