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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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}
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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
WOS
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
WOS
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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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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