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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Brukhatov N. L., Kirensky L. V.
Заглавие : The anisotropy of the magnetiс, energy in single crystals of nickel as a function of temperature
Место публикации : Phys. Zeit. der Sowjetunion. - 1937. - Band 12, Heft 5. - P.602-609
Аннотация: The energy constant of the magnetic anisotropy of a single crystal of nicel as a function of temperature has been investigated by measuring the mechanical moments exerted on the sphere shaped crystal by the magnetic field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaeva A. I., Kotlyarskii M. M., Popov F. A., Edelman I. S.
Заглавие : Comparative-study of polytype phase energy-spectrum of RbMnCl3 anti-ferromagnet
Место публикации : Fiz. Tverd. Tela. - 1980. - Vol. 22, Is. 3. - P.645-651. - ISSN 0367-3294
Примечания : Cited References: 16
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berman G. P., Kolovsky A. R.
Заглавие : Structure and stability of the quasi-energy spectrum of 2 interacting quantum non-linear resonances
Место публикации : Phys. Lett. A. - 1983. - Vol. 95, Is. 1. - P.15-18. - ISSN 0375-9601, DOI 10.1016/0375-9601(83)90768-5
Примечания : Cited References: 5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : ZAKHAROV Y. V., TITOV L. S.
Заглавие : THE ENERGY-SPECTRUM OF CONDUCTION ELECTRONS IN A FERROMAGNET WITH DOMAIN-STRUCTURE
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 1985. - Vol. 53, Is. 5. - P447-450. - ISSN 0038-1098, DOI 10.1016/0038-1098(85)91054-3
Примечания : Cited References: 8
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : ERUKHIMOV M. S., Ovchinnikov S. G.
Заглавие : CARRIER ENERGY FLUCTUATION SHIFT IN WIDE-GAP ANTIFERROMAGNETIC SEMICONDUCTORS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1986. - Vol. 28, Is. 8. - P2306-2309. - ISSN 0367-3294
Примечания : Cited References: 9
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., YERUKHIMOV M. S., Ovchinnikov S. G., Edelman I. S.
Заглавие : MULTIELECTRON ENERGY STRUCTURE AND PHYSICAL-PROPERTIES OF THE FERROMAGNETIC SEMICONDUCTOR CDCR2SE4
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1986. - Vol. 90, Is. 4. - P1275-1287. - ISSN 0044-4510
Примечания : Cited References: 36
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Podoprigora V. G., Gunyakov V. A., Parshin A. M., Khrustalev B. P., Shabanov V. F.
Заглавие : Liquid crystals on the solid state surface - the determination of anchoring energy under an applied magnetic field
Место публикации : Molecular Crystals and Liquid Crystals. - 1991. - Vol. 209, Is. 1. - P.117-121
Аннотация: Local electric field of light waves in Langmuir-Blodgett film is calculated, and its effect on optical second harmonic generation (SHG) is estimated. Strong dependence of SHG intensity on the film thickness is explained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Parshin A. M., Khrustalev B. P., Shabanov V. F.
Заглавие : Determination of anchoring energy for nematic onto ferroelectric substrate
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 1993. - Vol. 87, Is. 9. - P.751-753. - ISSN 0038-1098, DOI 10.1016/0038-1098(93)90406-D
Примечания : Cited References: 8
Предметные рубрики: LIQUID-CRYSTALS
SURFACE
Аннотация: A technique to determine anchoring energy of planar MBBA layer with cleavage surfaces of triglycine sulphate is presented. The method is based on guest-host phenomenon in impure nematic. The anchoring energy W = (1.0 +/- 0.3).10(-4) erg/cm2 is calculated within Rapini-Papoular approximation.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sandalov I. S., Johansson B.
Заглавие : Effects of a low-energy local mode on the eliashberg function
Разночтения заглавия :авие SCOPUS: Effects of a low-energy local mode on the Eliashberg function
Место публикации : Phys. Rev. B. - 1994. - Vol. 49, Is. 17. - P.12105-12114. - ISSN 0163-1829, DOI 10.1103/PhysRevB.49.12105
Примечания : Cited References: 13
Предметные рубрики: K3C60
HEAT
Аннотация: Anharmonic contributions to the Eliashberg function due to a low-energy local boson mode of finite width are considered for a harmonic metal. Excitation of the multiple-frequency modes leads to redistribution of spectral weight in the generalized Eliashberg function from the low- to the high-energy region, which reduces the electron-boson coupling. This is seen in the calculated temperature dependence of the interaction constants lambda(n) entering the Eliashberg equations. The rapid decrease with temperature of lambda(n)0 can be used to derive a simple analytical expression, which reproduces almost exactly the temperature dependence, lambda(n)0(T), calculated from the exact expression. Normal-state properties of alkaline-doped C60 are investigated within the two-peak model (omega0 approximately 50 K and omega1 approximately 900 K) for the possibility to extract information about the local modes themselves and their coupling to the conduction electrons. The electronic specific heat shows pecularities only in the case of an extremely strong coupling. Due to the low-energy peak the temperature dependence of the electrical resistivity deviates more and more from the linear law with increasing adiabaticity parameter A = (m/M)(epsilon(F)/Homega0BAR). This leads, however, to a negative-curvature dependence. The experimental curve for K3C60 has a positive curvature and can be fitted only in the case of a very strong coupling of electrons to the high-energy mode. The thermal electronic conductivity displays a minimum at T approximately Homega0BAR/k(B). The curvature as a function of temperature is determined by the magnitude of A.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : ZINENKO V. I., FEDOROV A. S.
Заглавие : CALCULATION OF LONG-WAVELENGTH PHONON FREQUENCIES, OF DIELECTRIC PERMITTIVITY, AND B1-B2 PHASE-TRANSITIONS IN ALKALI-METAL HYDRIDES BY THE DENSITY-FUNCTIONAL TECHNIQUE
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1994. - Vol. 36, Is. 5. - P1357-1365. - ISSN 0367-3294
Примечания : Cited References: 17
Предметные рубрики: PRESSURE
ENERGY
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shabanov V. F., Korshunov M. A.
Заглавие : Manifestation of vacancies in spectra of low frequencies and the calculations of migration energy in paradichlorobenzene and paradichlorobenzene at different temperatures
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1995. - Vol. 37, Is. 11. - P.3463-3469. - ISSN 0367-3294
Примечания : Cited References: 13
Предметные рубрики: CRYSTAL
ALPHA
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. A., Shabanov V. F.
Заглавие : Calculation of the energy of admixture migration in paradibromobenzene-paradichlorobenzene mixed crystals due to low concentrations
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1995. - Vol. 37, Is. 11. - P.3505-3509. - ISSN 0367-3294
Примечания : Cited References: 11
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Avramov P. V.
Заглавие : Effects of intense electron correlations on x-ray and x-ray electron copper spectra of high-temperature superconductors
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1995. - Vol. 37, Is. 9. - P.2559-2567. - ISSN 0367-3294
Примечания : Cited References: 22
Предметные рубрики: HIGH-ENERGY SPECTROSCOPY
HIGH-TC SUPERCONDUCTORS
SATELLITES
LA2CUO4
OXIDES
HOLES
STATE
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Gavrishin I. V., Chekanova L. A.
Заглавие : Experimental study of the energy gap in the spin-wave spectrum in Co/Pd multilayer films
Место публикации : JETP Letters. - 1996. - Vol. 63, Is. 12. - P.989-993. - ISSN 0021-3640, DOI 10.1134/1.567132
Примечания : Cited References: 20
Предметные рубрики: LAYERED MAGNETIC-STRUCTURES
RESONANCE
MODES
FMR
Аннотация: The energy gap appearing in the spin-wave spectrum as a result of Bragg scattering by the modulation period q = 2 pi/(d(1)+d(2)) Of a one-dimensional superlattice is observed by the method of spin-wave resonance in Co/Pd multilayer films. It is shown that this gap is asymmetric: The ''positive'' deviation is from two to three times greater than the ''negative'' deviation. (C) 1996 American Institute of Physics.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berman G. P., Bulgakov E. N., Campbell D. K., Krive I. V.
Заглавие : Quantum nonlinear resonance and quantum chaos in Aharonov-Bohm oscillations in mesoscopic semiconductor rings
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 1997. - Vol. 56, Is. 16. - P10338-10354. - ISSN 0163-1829, DOI 10.1103/PhysRevB.56.10338
Примечания : Cited References: 51
Предметные рубрики: EXCITED HYDROGEN-ATOMS
FREQUENCY ELECTROMAGNETIC-FIELD
PERSISTENT CURRENTS
NORMAL-METAL
ENERGY SPACE
LOCALIZATION
TRANSPORT
LOOP
TIME
TRANSMISSION
Аннотация: We consider Aharonov-Bohm oscillations in a mesoscopic semiconductor ring threaded by both a constant magnetic flux and a time-dependent, resonant magnetic field with one or two frequencies. Working in the ballistic regime, we establish that the theory of ''quantum nonlinear resonance'' applies, and thus that this system represents a possible solid-state realization of ''quantum nonlinear resonance'' and ''quantum chaos.'' In particular, we investigate the behavior of the time-averaged electron energy at zero temperature in the regimes of (i) an isolated quantum nonlinear resonance and (ii) the transition to quantum chaos, when two quantum nonlinear resonances overlap. The time-averaged energy exhibits sharp resonant behavior as a function of the applied constant magnetic flux, and has a staircase dependence on the amplitude of the external time-dependent field. In the chaotic regime, the resonant behavior exhibits complex structure as a function of flux and frequency. We compare and contrast the quantum chaos expected in these mesoscopic ''solid-state atoms'' with that observed in Rydberg atoms in microwave fields, and discuss the prospects for experimental observation of the effects we predict.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Ovchinnikov S. G.
Заглавие : Low-energy electron spectrum in copper oxides in the multiband p-d model
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1998. - Vol. 40, Is. 2. - P163-168. - ISSN 1063-7834, DOI 10.1134/1.1130262
Примечания : Cited References: 31
Предметные рубрики: HIGH-TC SUPERCONDUCTORS
SR2CUO2CL2
STATES
PLANES
Аннотация: An exact diagonalization of the Hamiltonian in the p-d model of a CuO6 cluster was used to obtain dependences on the model parameters of the lowest-energy two-hole terms: the energy difference between the 2p orbitals of planar and apical oxygen Delta(apex) = epsilon(2p) - epsilon[2p(apex)], the crystal field parameter Delta(d) = epsilon(3z2-r2)-epsilon(x2-y2), and the ratio of the distances between the copper atom and the apical and planar oxygen atoms d(apex)/d(pl). In the limit of large d(apex)/d(pl) and Delta(d), OUT model is equivalent to the three-band p-d model and, in this case, large singlet-triplet splitting Delta epsilon greater than or equal to 1 eV is also observed. As the parameters decrease, a singlet-triplet crossover is observed. Two mechanisms are identified for stabilization of the tripler term B-3(1g)(0) as the ground state. It is shown that for realistic values of the parameters, reduction of the p-d model to the three-band model is limited by the low energies of the current excitations because of the presence of the lower excited B-3(1g), and (1)A(1g) cluster states. Intercluster hopping causes strong mixing of singlet and triplet states far from the Gamma point. The results of the calculations are compared with data obtained by angle-resolved photoelectron emission in Sr2CuO2Cl2. (C) 1998 American Institute of Physics.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Parshin A. M., Shabanov V. F.
Заглавие : Investigation of the nematic-ferroelectric interface under a strong magnetic field
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 1998. - Vol. 105, Is. 12. - P761-765. - ISSN 0038-1098, DOI 10.1016/S0038-1098(97)10221-6
Примечания : Cited References: 14
Предметные рубрики: ANCHORING ENERGY
LIQUID-CRYSTAL
WALL INTERFACE
SURFACE
TRANSITION
Ключевые слова (''Своб.индексиров.''): ferroelectrics--liquid crystals--surfaces and interfaces--phase transitions--light absorption
Аннотация: The behaviour of methoxy benzylidene butyl aniline (MBBA) nematic liquid crystal on the;cleavage surface of triglycine sulphate under a strong magnetic field has been investigated. With the saturation regime obtained for the liquid crystal cell in fields up to 100 kOe, for the first time the possibility appears to determine not only the ordinary anchoring coefficient W-2, but the effective anchoring energy W* without any fitting procedure. Considerable difference in these parameters (two orders of magnitude) disagrees with "electrical" corrections of the Rapini-Papoular approximation. This discrepancy is connected with the surface polarization caused by spontaneous ordering of longitudinal components of MBBA molecular dipoles on interface. The form of the anisotropic interaction potential for such interfaces has to take into account polar effects in near-surface layers of the liquid crystal. (C) 1998 Elsevier Science Ltd.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fransson J., Eriksson O., Johansson B., Sandalov I. S.
Заглавие : On the non-orthogonality problem in the description of quantum devices
Коллективы : International Conference on Nonequilibrium Carrier Dynamics in Semiconductors
Место публикации : Physica B/ International Conference on Nonequilibrium Carrier Dynamics in Semiconductors (11 ; 1999 ; July ; 19-23 ; Kyoto, Japan). - 1999. - Vol. 272, Is. 1-4. - P.28-30. - ISSN 0921-4526, DOI 10.1016/S0921-4526(99)00343-9
Примечания : Cited References: 8
Предметные рубрики:
Ключевые слова (''Своб.индексиров.''): non-orthogonality--current--tunneling--correlation methods--electric contacts--electric currents--electron energy levels--electron tunneling--equations of motion--green's function--mathematical operators--matrix algebra--hubbard operators--potential barriers--tunneling currents--semiconductor quantum dots
Аннотация: An approach which allows to include the corrections from non-orthogonality of electron states in contacts and quantum dots is developed. Comparison of the energy levels and charge distributions of electrons in 1D quantum dot (QD) in equilibrium, obtained within orthogonal (OR) and non-orthogonal representations (NOR), with the exact ones shows that the NOR provides a considerable improvement, for levels below the top of barrier. The approach is extended to non-equilibrium states. A derivation of the tunneling current through a single potential barrier is performed using equations of motion for correlation functions. A formula for transient current derived by means of the diagram technique for Hubbard operators is given for the problem of QD with strongly correlated electrons interacting with electrons in contacts. The non-orthogonality renormalizes the tunneling matrix elements and spectral weights of Green functions. (C) 1999 Elsevier Science B.V. All rights reserved.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Quantum Monte Carlo investigation of the 2D Heisenberg model with S=1/2
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 1999. - Vol. 41, Is. 1. - P103-107. - ISSN 1063-7834, DOI 10.1134/1.1130737
Примечания : Cited References: 33
Предметные 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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