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1.


   
    Effect of hydrostatic-pressure on modulated phases in Rb2ZnBr4 / K. PARLINSKI [et al.] // Phys. Rev. B. - 1992. - Vol. 46, Is. 1. - P. 106-114, DOI 10.1103/PhysRevB.46.106. - Cited References: 36 . - ISSN 0163-1829
РУБ Physics, Condensed Matter
Рубрики:
INCOMMENSURATE PHASES
   NEUTRON-SCATTERING
   X-RAY
   COMMENSURATE
   TRANSITIONS
   EVOLUTION
   MODEL
   WAVE
Аннотация: Neutron-diffraction studies on modulated Rb2ZnBr4, carried out under hydrostatic pressure, revealed two new commensurate phases characterized by wave vectors q = 2/7b* and q = 1/4b*, respectively. The first order phase transition between them is revealed by the coexistence of two distinct peaks in the diffraction pattern. The observed pressure-temperature phase diagram contains: the above-mentioned phases, the ferroelectric commensurate phase q = 1/3, and a region characterized by wave-vector values in the interval q = 2/7-1/3. In this region the modulation wave vector exhibits stepwise behavior as a function of pressure, but remains nearly constant iii temperature runs. We have found in this region a characteristic memory effect in which two temperature runs performed at the same pressure lead to two different modulation wave-vector values, while only the thermal history of the sample is different in the two runs. At ambient pressure we confirm the presence of a multipeaked diffraction pattern just above the lock-in transition to the commensurate q = 1/3 phase. At 122 K the phase transition from the 1/3 phase to the 1/4 phase is detected in pressure scans. The transition mechanism involves the q = 2/7 phase, at least as a metastable intermediate phase.

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Держатели документа:
INST NUCL PHYS,PL-31342 KRAKOW,POLAND
LV KIRENSKY PHYS INST,KRASNOYARSK 660036,USSR
ИФ СО РАН
Institut Laue-Langevin, 156X Centre de Tri, 38042 Grenoble, France
Institute of Nuclear Physics, ul. Radzikowskiego 152, 31-342 Cracow, Poland
L. V. Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Institut f?r Kristalographie, Rheinisch-Westfalische Technische Hochschule Aachen, Aachen, Germany
Institut f?r Festkorperforschung, Kernforschungsanlage J?lich G.m.b.H., J?lich D-5170, Germany

Доп.точки доступа:
PARLINSKI, K.; CURRAT, R.; VETTIER, C.; ALEKSANDROVA, I. P.; Александрова, Инга Петровна; ECKOLD, G.
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2.


    OVCHINNIKOV, S. G.
    DENSITY OF SINGLE-PARTICLE STATES IN STRONGLY CORRELATED ELECTRON-SYSTEMS IN COPPER OXIDES / S. G. OVCHINNIKOV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1993. - Vol. 104, Is. 5. - P. 3719-3734. - Cited References: 24 . - ISSN 0044-4510
РУБ Physics, Multidisciplinary
Рубрики:
DYNAMIC PROPERTIES
   BAND
   SPECTRA
   MODEL

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3.


    Ovchinnikov, S. G.
    Density of hole-doped states in strongly correlated electron-systems of copper oxides / S. G. Ovchinnikov // Phys. Rev. B. - 1994. - Vol. 49, Is. 14. - P. 9891-9897, DOI 10.1103/PhysRevB.49.9891. - Cited References: 34 . - ISSN 0163-1829
РУБ Physics, Condensed Matter
Рубрики:
DYNAMIC PROPERTIES
   SUPERCONDUCTIVITY
   GAP
   LA2CUO4
   BI2SR2CACU2O8
   PHOTOEMISSION
   SPECTROSCOPY
   SPECTRA
   MODEL
   BAND
Аннотация: A generalized tight-binding method to calculate quasiparticle band structure and density of states in strongly correlated systems is presented. The band structures of undoped and weakly hole-doped CuO2 layer are calculated. The insulator gap has a charge transfer nature with a minor contribution from a Cu-O Coulomb interaction. Doping results in the appearance of an in-gap state with a simultaneous decrease of the density of states at the band edges in agreement with small cluster results and experimental data.

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Scopus
Держатели документа:
L. V. Kyrensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Овчинников, Сергей Геннадьевич
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4.


    Deich, L. I.
    Far-infrared attenuation in glasses / L. I. Deich // Phys. Rev. B. - 1994. - Vol. 49, Is. 1. - P. 109-113, DOI 10.1103/PhysRevB.49.109. - Cited References: 29 . - ISSN 0163-1829
РУБ Physics, Condensed Matter
Рубрики:
VITREOUS SILICA
   TEMPERATURE
   MODEL
   LOCALIZATION
   ABSORPTION
   SOLIDS
   STATES
Аннотация: The influence of quasilocal vibrations on the far-infrared spectra of glasses is investigated under the supposition that the quasilocal vibrations are directly inactive in the attenuation. It is shown that taking into account phonon-quasilocal-vibration coupling and both medium- and short-range structure of the inhomogeneities of a photon-phonon coupling parameter can give rise to an attenuation curve similar to one observed for a-SiO2 and related materials.

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Scopus
Держатели документа:
L. V. Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Дейч, Лев Исаакович
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5.


    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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6.


    Ovchinnikov, S. G.
    EFFECT OF ANTIFERROMAGNETIC ORDERING ON ZONE STRUCTURE OF LA2CUO4 / C. G. OVCHINNIKOV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1995. - Vol. 107, Is. 3. - P. 796-811. - Cited References: 42 . - ISSN 0044-4510
РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TC SUPERCONDUCTORS
   ELECTRONIC-STRUCTURE
   OXIDE SUPERCONDUCTORS
   CHARGE-TRANSFER
   CUO2 PLANE
   MODEL
   HOLE
   SPECTRUM
   STATE

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Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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7.


   
    ORBITAL POLARIZATION IN METALLIC F-ELECTRON SYSTEMS / I. S. SANDALOV [et al.] // Phys. Rev. B. - 1995. - Vol. 51, Is. 20. - P. 13987-14000, DOI 10.1103/PhysRevB.51.13987. - Cited References: 28 . - ISSN 0163-1829
РУБ Physics, Condensed Matter
Рубрики:
MOTT INSULATORS
   VOLUME COLLAPSE
   CERIUM
   LOCALIZATION
   TRANSITION
   PHASES
   MODEL

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Scopus
Держатели документа:
RUSSIAN ACAD SCI,KIRENSKY INST PHYS,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН
Condensed Matter Theory Group, Institute of Physics, University of Uppsala, Uppsala, Sweden
Kirensky Institute of Physics, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
SANDALOV, I. S.; Сандалов, Игорь Семёнович; HJORTSTAM, O.; JOHANSSON, B.; ERIKSSON, O.
}
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8.


    Aplesnin, S. S.
    Dimerization of antiferromagnetic chain with 4-spin interaction / S. S. Aplesnin // Fiz. Tverd. Tela. - 1996. - Vol. 38, Is. 6. - P. 1868-1877. - Cited References: 30 . - ISSN 0367-3294
РУБ Physics, Condensed Matter
Рубрики:
SPIN-1/2 HEISENBERG-ANTIFERROMAGNET
   COMPETING INTERACTIONS
   MONTE-CARLO
   THERMODYNAMIC PROPERTIES
   SYSTEMS
   CUGEO3
   TEMPERATURE
   NEUTRON
   STATE
   MODEL

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9.


    Bulgakov, E. N.
    Current-voltage characteristics of the resonant tunnelling double-barrier structure under time-periodical perturbation / E. N. Bulgakov, A. F. Sadreev // J. Phys.: Condens. Matter. - 1996. - Vol. 8, Is. 45. - P. 8869-8887, DOI 10.1088/0953-8984/8/45/020. - Cited References: 38 . - ISSN 0953-8984
РУБ Physics, Condensed Matter
Рубрики:
SEMICONDUCTOR DOUBLE-BARRIER
   OSCILLATING QUANTUM-WELL
   DEPENDENT TRANSPORT
   INFRARED-RADIATION
   TUNNELING TIMES
   HETEROSTRUCTURES
   TRANSMISSION
   MODEL
   FREQUENCIES
   COHERENT
Аннотация: We consider a typical semiconductor resonant tunnelling GaAs/AlGaAs/GaAs nanostructure which forms a double-barrier potential with quasienergy levels corresponding to transition frequencies in the infrared and microwave regions. Two types of dynamical perturbation of the heterostructure in the form V-1(x, t) = V(1)x cos Omega t and V-2(t) = V-2 cos Omega t are considered. We analyse numerically a reconstruction of the electron transmission through the heterostructure and the current-voltage characteristics (IVC) under the influence of these dynamical perturbations. Both weak and strong perturbations are considered. We investigate the dependences of the transmission on the electron energy and the frequency of the external field with the main accent on the case where a frequency of the perturbation is tuned to a transition between quasienergies of the double-barrier structure. it is found that these resonant phenomena give rise to new peaks and dips in the IVC. In particular, it is shown that the dipole type of perturbation V-1(x, t) gives rise to a Rabi splitting of the transmission peaks and under certain conditions to a Rabi splining of the IVC peaks and dips. We demonstrate that dynamical perturbation may induce a direct current opposite to the direction of the applied voltage, and that this phenomenon takes the form of a sharp dip which has a resonant origin. It is observed that the dipole type of perturbation V-1(x, t) of laser radiation is more effective for tuning the IVC than the first perturbation V-2(t). Also absorption and emission of energy by an electron transmitted through the DBRTS are considered.

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Держатели документа:
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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10.


    Sadreev, A. F.
    Phase transitions in a system of CH3(CH2)(n-1) self-assembled on the Au(111) crystal surface / A. F. Sadreev, Y. V. Sukhinin // Phys. Rev. B. - 1996. - Vol. 54, Is. 24. - P. 17966-17973, DOI 10.1103/PhysRevB.54.17966. - Cited References: 44 . - ISSN 1098-0121
РУБ Physics, Condensed Matter
Рубрики:
ORGANIZED MOLECULAR ASSEMBLIES
   ALKYL THIOL MONOLAYERS
   STRUCTURAL CHARACTERIZATION
   DYNAMICS SIMULATION
   DEVILS STAIRCASE
   GOLD SURFACES
   FILMS
   MODEL
   CHAIN
   DIFFRACTION
Аннотация: The n-alkanethiols CH3(CH2)(n-1) on the crystal surface of gold (111) are considered. Couplings between atoms (C, H) of the n-alkanethiols were modelled by the Morse potential, and couplings between the n-alkanethiols and the crystal surface were modelled by 12-3 potentials. Because of symmetry Z(2) of the n-alkanethiols in a tilted state, the system can be reduced to the Ising model on the triangular lattice, the phase diagram of which can be explicitly considered. Depending on the choice of the coupling parameters, the ordered state of the system may form an incommensurate or 2X1 superstructure. The temperatures of the phase transition, equilibrium tilting, twisting, and azimuthal angles are found to depend on the Morse coupling constants.

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Доп.точки доступа:
Sukhinin, Y. V.; Садреев, Алмаз Фаттахович
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