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1.


    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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2.


    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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3.


    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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4.


    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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5.


    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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6.


    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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7.


    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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8.


    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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9.


    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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