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Общее количество найденных документов : 157
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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gekht R.S., Ignatchenko V. A.
Заглавие : Magnetic states in structures of space-periodic distributed ferromagnetic particles
Место публикации : Fiz. Nizk. Temp. - 1981. - Vol. 7, Is. 9. - P.1176-1183. - ISSN 0132-6414
Примечания : Cited References: 8
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : PETRAKOVSKII G. A., PISKORSKII V. P., SOSNIN V. M., KOSOBUDSKII I. D.
Заглавие : ELECTRON-PARAMAGNETIC-RES OF TRANSITION-METAL SUPER-PARAMAGNETIC PARTICLES IN POLYMER MATRICES
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1983. - Vol. 25, Is. 11. - P3256-3260. - ISSN 0367-3294
Примечания : Cited References: 18
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Petrakovsky G. A.
Заглавие : Quasi-particle spectrum in copper oxides
Разночтения заглавия :авие SCOPUS: Quasiparticle spectrum in copper oxides
Место публикации : J. Supercond. - 1991. - Vol. 4, Is. 6. - P.437-448. - ISSN 0896-1107, DOI 10.1007/BF00635862
Примечания : Cited References: 0
Ключевые слова (''Своб.индексиров.''): 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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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ramm A. G., Berman G. P.
Заглавие : Inverse problem for multiple-scattering fast charged-particles in a mesoscopic medium
Место публикации : Phys. Rev. B. - 1995. - Vol. 51, Is. 4. - P.2406-2409. - ISSN 0163-1829, DOI 10.1103/PhysRevB.51.2406
Примечания : Cited References: 11
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Morozova T. P., Zabluda V. M., Kim T. A., Turpanov I. A., Betenkova A. Ya., Dynnik Y. A.
Заглавие : Dispersion of Faraday rotation in Co/SiO2 multilayer films
Место публикации : JETP Letters. - 1996. - Vol. 63, Is. 4. - P.273-277. - ISSN 0021-3640, DOI 10.1134/1.567015
Примечания : Cited References: 9
Предметные рубрики: PARTICLES
Аннотация: The Faraday rotation spectra of Co/SiO2 multilayer films were found to be substantially different from the well-known spectra of homogeneous Co films. The character of these changes was studied as a function of the thicknesses of the ferromagnetic metal and the nonmagnetic dielectric layers. (C) 1996 American Institute of Physics.
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Two-particle spin-singlet excitations in coupled spin-1/2 antiferromagnetic alternating chains
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2001. - Vol. 13, Is. 14. - P.3403-3410. - ISSN 0953-8984, DOI 10.1088/0953-8984/13/14/313
Примечания : Cited References: 14
Предметные рубрики: MAGNETIC-PROPERTIES
LIGHT-SCATTERING
CUGEO3
S=1/2
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--approximation theory--chemical bonds--electron transport properties--monte carlo methods--particles (particulate matter)--quantum theory--thermal effects--antiferromagnetic alternating chains--excitation spectrum--interchain exchange--mean-field approximation--quantum monte carlo method--singlet gaps--spin-singlet excitations--energy gap
Аннотация: The spectrum of the two-particle spin-singlet (DeltaS(z) = 0, +/-1) excitations of a weakly coupled antiferromagnetic spin-1/2 alternating (J(1) +/- delta) chain is calculated using a mean-field approximation for the interchain exchange (J(2)) by the quantum Monte Carlo method. The bandwidth change of these excitations, the mass gaps in the singlet-singlet excitation spectrum, the top boundaries of the bands and the velocities of these excitations are estimated as functions of the alternating bond delta. The temperatures at which the singlet gaps close are determined.
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ivantsov R., Vasiliev A., Stepanov S., Kornilova E., Zarubina T.
Заглавие : Superparamagnetic and ferrimagnetic nanoparticles in glass matrix
Место публикации : Physica B. - 2001. - Vol. 301, Is. 3-4. - P.203-211. - ISSN 0921-4526, DOI 10.1016/S0921-4526(01)00274-5
Примечания : Cited References: 9
Предметные рубрики: MAGNETIC-PROPERTIES
PARTICLES
FILMS
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--faraday rotation--faraday rotation--magnetic nanoparticles--crystal structure--faraday effect--ferrimagnetic materials--glass--particle size analysis--superparamagnetism--x ray diffraction analysis--amorphous glass matrices--faraday rotations--nanostructured materials
Аннотация: Faraday rotation (FR) spectral, field, and temperature dependencies in oxide glasses with small additions of paramagnetic elements are investigated. Formation of ferrite nanoparticles in amorphous glass matrices is revealed by X-ray diffraction. Particles have crystal structure similar to spinel structure, their dimensions are about 10-24 nm. The FR field dependencies are typical for ferrimagnetic or superparamagnetic substances depending on particle size. Strong FR increase at the samples cooling (more than twice for some samples) in the temperature interval 105-273 K is observed. (C) 2001 Elsevier Science B.V. All rights reserved.
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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrilyuk S. A., Krasnov I. V., Polyutov S. P.
Заглавие : Three-dimensional interference effects in the mechanical action of weak biharmonic fields upon particles with the J=0 - J=1 quantum transition
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2001. - Vol. 93, Is. 5. - P985-997. - ISSN 1063-7761, DOI 10.1134/1.1427110
Примечания : Cited References: 29
Предметные рубрики: ATOM TRAP
FORCE
PRESSURE
PLASMA
WAVES
Аннотация: Explicit expressions are derived for the rectified radiative forces (RRFs) related to the action of a weak interfering optical field of an arbitrary three-dimensional (3D) configuration upon resonance particles featuring the J = 0 -- J = 1 quantum transition. It is shown that, in contrast to the case of a monochromatic field, there are simple 3D biharmonic field configurations for which the ratio of the vortex and potential RRF components can be controlled by adjusting frequencies and polarizations of the interfering light waves. This modification of the RRF structure gives rise to qualitatively different types of both vortex and potential light-induced particle motions that may lead to a 3D spatial localization (confinement) of these particles within the cells of an effective optical lattice with a period significantly greater than the light wavelength. In particular, the particles may perform a stable rotational motion along closed trajectories inside the elementary cells. (C) 2001 MAIK "Nauka/Interperiodica".
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Fluctuations of orientational order in a uniaxial nematic liquid crystal with biaxial molecules and its response to an external field
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 5. - P990-1001. - ISSN 1063-7834, DOI 10.1134/1.1575350
Примечания : Cited References: 30
Предметные рубрики: PHASE-TRANSITION
SMECTIC-A
PARTICLES
SYSTEM
LANDAU
MODEL
Аннотация: Homogeneous thermal fluctuations of the orientational order parameters S and G of biaxial molecules in a uniaxial nematic liquid crystal are investigated in the framework of the molecular-statistical theory. It is demonstrated that the molecular biaxiality significantly affects the order parameters S and G, their temperature dependences in the nematic phase, the amplitude and the temperature dependence of the order parameter fluctuations in the nematic and isotropic phases, and the character of the transition from the nematic phase to the isotropic liquid phase. It is established that the fluctuations of the parameters S and G in the nematic phase are related to the temperature dependences of S and G and the susceptibilities chi(S) and chi(G) of the nematic liquid crystal to external fields, which leads to a change in the parameters S and G at a fixed director orientation. Explanations are offered for the known experimental data on the orientational ordering of biaxial molecules under the action of external fields in the isotropic phase of nematic liquid crystals. (C) 2003 MAIK "Nauka/Interperiodica".
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Ovchinnikov S. G.
Заглавие : The band structure of n-type cuprate superconductors with the T '(T) structure taking into account strong electron correlation
Разночтения заглавия :авие SCOPUS: The band structure of n-type cuprate superconductors with the T′(T) structure taking into account strong electron correlation
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2004. - Vol. 98, Is. 3. - P556-564. - ISSN 1063-7761, DOI 10.1134/1.1705708
Примечания : Cited References: 18. - This work was financially supported by the Russian Foundation for Basic Research (project no. 03-02-16124), RFFI-KKFN “Eniseœ” (project no. 02-02-97705), INTAS (project no. 01-0654), integration program of URO and Siberian Division, Russian Academy of Sciences
Предметные рубрики: QUASI-PARTICLES
COPPER OXIDES
TEMPERATURE
LA2-XSRXCUO4
ND2-XCEXCUO4
EVOLUTION
MOMENTS
Ключевые слова (''Своб.индексиров.''): dielectric properties--electric conductance--electron transitions--electronic structure--fermi level--phase diagrams--semiconductor doping--conduction bands--electron correlation--spectral density--superconducting materials
Аннотация: The spectral density, dispersion relations, and the position of the Fermi level for n-doped compositions based on NCO and LCO were calculated within the framework of the generalized tight binding method. As distinguished from LCO, the dielectric gap in NCO is nonlinear in character. We observe a virtual level both at the bottom of the conduction band and at the top of the valence band in both compounds. However, its position corresponds to the extreme bottom of the conduction band in LCO and is 0.1 - 0.2 eV above the bottom in NCO. This explains why we observe Fermi level pinning in n-LCO as the concentration of the doping component grows and reproduce its absence in NCCO at low doping values. We also found both compositions to be unstable in a narrow concentration range with respect to a nonuniform charge density distribution. The relation between the phase diagram for NCCO and the calculated electronic structure is discussed. (C) 2004 MAIK "Nauka/Interperiodica".
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