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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Filonov A. N.
Заглавие : Change of phonon attenuation at metal-dielectric transition
Место публикации : Fiz. Tverd. Tela. - 1980. - Vol. 22, Is. 2. - P.328-331. - ISSN 0367-3294
Примечания : Cited References: 8
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmin E. V., Ovchinnikov S. G., Sandalov I. S.
Заглавие : Paramagnetic-susceptibility and phonon instability of metal with localized and collectivized electron state mixing
Место публикации : Fiz. Tverd. Tela. - 1980. - Vol. 22, Is. 2. - P.424-430. - ISSN 0367-3294
Примечания : Cited References: 22
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berzhanskii V. N., Ivanov V. I.
Заглавие : Spin-phonon relaxation processes in CDCR2SE4 crystals
Место публикации : Fiz. Tverd. Tela. - 1980. - Vol. 22, Is. 4. - P.1233-1235. - ISSN 0367-3294
Примечания : Cited References: 10
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prokert F., Aleksandrov K. S.
Заглавие : Neutron scattering studies on phase transition and phonon dispersion in Cs//2NaBiCl//6
Место публикации : Phys Status Solidi B. - 1984. - Vol. 124, Is. 2. - P.503-513. - ISSN 0370-1972, DOI 10.1002/pssb.2221240208
Примечания : Cited References: 24
Ключевые слова (''Своб.индексиров.''): neutrons - scattering--phonons--phase transition--phonon dispersion--cesium compounds
Аннотация: The structural phase transition (PT) of elpasolite-type crystal Cs//2NaBiCl//6 is investigated by neutron scattering. At first the acoustic phonon dispersion is measured at room temperature for the high-symmetric directions DELTA , SIGMA , and LAMBDA of the Brillouin zone. The transverse rotary mode is studied for phonon wave vectors q parallel as well as perpendicular to DELTA and the dispersion shows a quasi-two-dimensional behavior of the Cl-octahedra rotation. At cooling down to the PT, this branch shows a softening along DELTA , reaching the lowest energies at the zone center. The PT, which is found to be of weakly first order, seems to be driven and triggered by the ferrorotative octahedra mode.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Botvich A. N., Shabanov V. F., Vtyurin A. N., Pozdnyakova T. A.
Заглавие : Photon phonon interaction influence on the external vibration-spectra of molecular-crystals
Разночтения заглавия :us: PHOTON-PHONON INTERACTION INFLUENCE ON THE EXTERNAL VIBRATION SPECTRA OF MOLECULAR CRYSTALS
Место публикации : Phys. Status Solidi B. - 1986. - Vol. 134, Is. 2. - P.515-522. - ISSN 0370-1972, DOI 10.1002/pssb.2221340209
Примечания : Cited References: 13
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : KUBAREV Y. G.
Заглавие : RAMAN SPIN-LATTICE RELAXATION AND DISPERSION OF DAMPED OPTICAL PHONON FREQUENCIES AT PHASE-TRANSITION
Место публикации : Ferroelectr. Lett. Sect.: GORDON BREACH SCI PUBL LTD, 1988. - Vol. 9, Is. 2. - P39-42. - ISSN 0731-5171, DOI 10.1080/07315178808200697
Примечания : Cited References: 3
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kubarev Y. G.
Заглавие : Raman spin-lattice relaxation and dispersion of damped optical phonon frequencies at phase-transition
Место публикации : Ferroelectr. Lett. Sect. - 1988. - Vol. 8, Is. 5-6. - P.113-116. - ISSN 0731-5171
Примечания : Cited References: 3
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Deich L. I., Ignatchenko V. A.
Заглавие : Phonon spectroscopy of inhomogeneities in disordered solids
Разночтения заглавия :us: Phonon spectroscopy of inhomogeneties in disordered solids
Место публикации : Solid State Commun. - 1991. - Vol. 80, Is. 10. - P.881-884. - ISSN 0038-1098, DOI 10.1016/0038-1098(91)90525-Z
Примечания : Cited References: 15
Предметные рубрики: SPIN-WAVES
AMORPHOUS FILMS
DISPERSION
FERROMAGNETS
Аннотация: A possibility to use elastic waves for investigation of inhomogeneities corresponding in size to intermediate order in disordered solids is considered. It is shown that frequency dependencies of phase and group velocities of the elastic waves have some peculiarities which give the possibilities to find the characteristic size of inhomogenities and to determine the parameter of a matter whose fluctuations are most significant for the phenomena under study.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : ZEIN N. E., ZINENKO V. I., FEDOROV A. S.
Заглавие : ABINITIO CALCULATIONS OF PHONON FREQUENCIES AND DIELECTRIC-CONSTANTS IN A(4)B(6) COMPOUNDS
Место публикации : Phys. Lett. A: ELSEVIER SCIENCE BV, 1992. - Vol. 164, Is. 1. - P115-119. - ISSN 0375-9601, DOI 10.1016/0375-9601(92)90916-A
Примечания : Cited References: 20
Предметные рубрики: IV-VI COMPOUNDS
CRYSTAL-STRUCTURE
Аннотация: The transverse and longitudinal optical frequencies at q = 0, the dielectric constant and the effective charges are calculated for the A4B6 type family of the semiconducting compounds GeTe, SnTe and PdTe. The calculations are performed in the framework of the density functional method with the use of the norm-conserving "first-principles" pseudopotentials. The estimated ferroelectric phase transition temperatures and a number of other calculated quantities turned out to be in good agreement with the experimental data. The variations of the electronic structure in the row PbTe-GeTe, which promote the ferroelectric phase transition for GeTe, are discussed.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Deich L. I.
Заглавие : On far-infrared attenuation in glasses
Место публикации : Phonon scattering in condensed matter: proceedings: Springer Verlag, 1993. - Vol. 112. - P.233-234. - (Springer series in solid-state sciences). - ISBN 0171-1873. - ISBN 3-540-56395-4
Примечания : Cited References: 0
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sandalov I. S.
Заглавие : Periodical anderson model and electron-phonon interaction
Коллективы : International Conference on the Physics of Transition Metals
Место публикации : Int. J. Mod. Phys. B. - 1993. - Vol. 7, Is. 1-3. - P.62-66. - ISSN 0217-9792, DOI 10.1142/S0217979293000160
Примечания : Cited References: 8
Предметные рубрики: STRONGLY CORRELATED SYSTEMS
COULOMB INTERACTION
LATTICE THEORY
Аннотация: The periodical Anderson model (PAM) is microscopically derived. It is shown that the PAM is a mean field theory for the electric potential. The mixing interaction (MI) consists of single- and two- particle contributions. The first is proportional to the overlap integral of localized and band wave functions and vanishes when band energies are on the Fermi surface. It leads to the absence of heavy-fermion effects in the theories based on the PAM with only this mixing term. Using the orthogonal basis this term vanishes only at zero temperature. Applicability of the Luttinger theorem to systems with strongly-correlated electrons (SSCE) is discussed. The phonon dynamic matrix and electron-phonon interaction (EPI) for SSCE are microscopically derived.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Deich L. I., Ignatchenko V. A.
Заглавие : Polarization properties of elastic-waves in anisotropic disordered media
Коллективы : International Conference on Phonon Scattering in Condensed Matter
Место публикации : Phonon scattering in condensed matter: proceedings: Springer Verlag, 1993. - Vol. 112. - P.231-232. - (Springer series in solid-state sciences). - ISBN 0171-1873. - ISBN 3-540-56395-4
Примечания : Cited References: 0
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13.

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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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Influence of spin-phonon coupling on the magnetic moment in 2D spin-1/2 antiferromagnet
Место публикации : Phys. Lett. A. - 2003. - Vol. 313, Is. 1-2. - P.122-125. - ISSN 0375-9601, DOI 10.1016/S0375-9601(03)00689-3
Примечания : Cited References: 17
Предметные рубрики: SQUARE LATTICE
EU2CUO4
MODEL
Ключевые слова (''Своб.индексиров.''): 2d heisenberg model--spin-phonon interactions--2d heisenberg model--spin-phonon interactions--ferromagnetic material--anisotropy--article--liquid--magnetism--mathematical model--monte carlo method--quantum theory--thermal conductivity--vibration
Аннотация: The ground state of two-dimensional Heisenberg spin-1/2 antiferromagnet (AF) with the spin-phonon coupling is studied by the quantum Monte Carlo method. The magnetic moment per site, mean-square vibration of ion, phase diagram of AF long range order-quantum spin. liquid are simulated. The spin-phonon coupling is estimated for R2CuO4, R = Gd, Eu. (C) 2003 Elsevier Science B.V. All rights reserved.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vtyurin A. N., Isaenko L. I., Krylova S. N., Yelisseyev A., Shebanin A. P., Turchin P. P., Zamkova N. G., Zinenko V. I.
Заглавие : Raman spectra and elastic properties of KPb2Cl5 crystals
Место публикации : 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA): WILEY-V C H VERLAG GMBH, 2004. - P3142-3145. - ISBN 3-527-40588-7, DOI 10.1002/pssc.200405401
Примечания : Cited References: 10
Предметные рубрики: LATTICE-DYNAMICS
Ключевые слова (''Своб.индексиров.''): computer simulation--crystal structure--eigenvalues and eigenfunctions--halogen compounds--nonlinear optics--phonons--potassium compounds--vectors--elastic constants--heavy cations--ionic electron envelopes--ionic interactions--raman scattering
Аннотация: Raman scattering spectra and elastic constants of KPb2Cl5 crystals have been studied. The results obtained are interpreted in terms of the ab initio lattice dynamics model taking into account multipole moments of ionic electron envelopes. The experimental results have been found to be in good agreement with numerical simulation; the narrow phonon spectra are shown to be due to a considerable contribution of heavy cations into the eigenvectors of the higher frequency lattice modes.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Two-dimensional quantum spin liquid with S=1/2 spins interacting with acoustic phonons
Разночтения заглавия :авие SCOPUS: Two-dimensional quantum spin liquid with S = 1/2 spins interacting with acoustic phonons
Место публикации : Phys. Lett. A. - 2004. - Vol. 333, Is. 5-6. - P.446-449. - ISSN 0375-9601, DOI 10.1016/j.physleta.2004.10.064
Примечания : Cited References: 11
Предметные рубрики: ANTIFERROMAGNET
Ключевые слова (''Своб.индексиров.''): spin-phonon interactions--spin-liquid--spinon excitations--spin-liquid--spin-phonon interactions--spinon excitations--ferromagnetic material--acceleration--acoustics--article--density--energy--liquid--magnetic field--mathematical analysis--monte carlo method--phonon--quantum mechanics
Аннотация: The spin density of states of a two-dimensional antiferromagnet in magnetic field having spins-1/2 and interacting with acoustic phonons is investigated in the nonadiabatic approximation using the quantum Monte Carlo method. It is found the gap energy A in the single particle spin excitations spectrum closes at magnetic field Delta similar or equal to H-c, W-ph W-s and Delta similar or equal to (1/2)H-c, W-ph W-s, where W-ph and W-s are the bandwidths of phonon and spin excitations in antiferromagnet. (C) 2004 Elsevier B.V All rights reserved.
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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vtyurin A. N., Goryainov S. V., Krylov A. S., Krylova S. N., Shefer A. D., Zamkova N. G., Zinenko V. I.
Заглавие : Raman spectra and pressure-induced lattice instabilities in RbMnCl3 crystal
Разночтения заглавия :авие SCOPUS: Raman spectra and pressure-induced lattice instabilities in RbMnCl 3 crystal
Место публикации : 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA): WILEY-V C H VERLAG GMBH, 2004. - 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA). - P3097-3100. - ISBN 3-527-40588-7, DOI 10.1002/pssc.200405332
Примечания : Cited References: 14
Предметные рубрики: PHASE-TRANSITION
SPECTROSCOPY
Ключевые слова (''Своб.индексиров.''): frequencies--hydrostatic pressure--mathematical models--parameter estimation--raman scattering--spectrometers--stability--ambient conditions--anomalies--lattice instabilities--structural units--rubidium compounds
Аннотация: Raman scattering spectra of the RbMnCl3 crystal have been studied under ambient conditions and under high hydrostatic pressure. The results produced have been interpreted with the ab initio model. The experimental data agree well with the estimated values in the low frequency range and show a slightly worse agreement at higher frequencies. A phase transition from the hexagonal phase to the perovskite phase predicted earlier within the same model was observed under high pressure (above 0.7 GPa) and new transitions to lower symmetry phases were found at higher pressures (1.1 GPa and 5 GPa). (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zinenko V. I., Sofronova S. N.
Заглавие : The nonempirical calculation of the cation ordering and lattice dynamics in the solid solutions of PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3
Место публикации : 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA): WILEY-V C H VERLAG GMBH, 2004. - P3047-3051. - ISBN 3-527-40588-7, DOI 10.1002/pssc.200405286
Примечания : Cited References: 10
Аннотация: An effective Hamiltonian for the study of Sc-Nb(Ta) cation ordering in PbSc1/2Nb(Ta)(1/2)O-3 solid solutions is written out. To determine the parameters of the effective Hamiltonian, a nonempirical calculation is performed within an ionic-crystal model taking into account the deformation, dipole and quadrupole polarizabilities of ions. The phase transition temperatures are calculated by mean field, cluster approximations and Monte-Carlo method. Within the same ionic-crystal model, we calculated the high-frequency permittivity, Born dynamic charges, and the phonon spectrum for a completely disordered and ordered phases. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Quantum magnetostriction oscillations in a two-dimensional antiferromagnet with spin-phonon interaction in a magnetic field
Место публикации : JETP Letters. - 2004. - Vol. 79, Is. 1. - P.53-56. - ISSN 0021-3640, DOI 10.1134/1.1675922
Примечания : Cited References: 7
Предметные рубрики: LADDERS
Аннотация: The ground state of a two-dimensional antiferromagnet with S = 1/2 interacting with acoustic phonons in a magnetic field was studied by the quantum Monte Carlo method in the nonadiabatic approximation. Oscillations of the amplitude of the root-mean-square displacement of ions and the average phonon occupation number in a magnetic field were found. Local maxima were revealed in the distribution functions of site magnetic moments and ion displacements. The saturation magnetization was calculated as a function of the spin-phonon coupling constant. (C) 2004 MAIK "Nauka / Interperiodica".
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pisarev R. V., Sanger I., Petrakovskii G. A., Fiebig M.
Заглавие : Magnetic-field induced second harmonic generation in CuB2O4
Разночтения заглавия :авие SCOPUS: Magnetic-field induced second harmonic generation in CuB2O 4
Место публикации : Phys. Rev. Lett.: AMER PHYSICAL SOC, 2004. - Vol. 93, Is. 3. - Ст.37204. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.93.037204
Примечания : Cited References: 28
Предметные рубрики: COPPER METABORATE
PHASE
CR2O3
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--crystal structure--energy gap--magnetic moments--magnetization--monochromators--nonlinear optics--paramagnetism--phase diagrams--polarization--second harmonic generation--single crystals--electric-field induced second harmonic (efish)--magnetic structure--magnetic-field induced second harmonic (mfish)--phonon transitions--copper compounds
Аннотация: Three types of optical magnetic-field induced second harmonic (MFISH) generation are observed in CuB2O4. Unusually sharp and intense electronic transitions in MFISH and linear absorption spectra provide selective access to the two nonequivalent Cu2+ sublattices. The magnetic phase diagram for both sublattices is determined by MFISH. Magnetic structure is dominated by antiferromagnetic order at the 4b site. Sublattice interactions transfer it to the 8d site where it coexists with a discoupled paramagnetic component.
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