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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarova I. P., Misyul S. V., Muradyan L. A., Bovina A. F., Simonov V. I., Aleksandrov K. S.
Заглавие : Anharmonic thermal atomic vibrations in the cubic phase of Cs//2NaNdCl//6 single crystals.
Место публикации : Phys Status Solidi B. - 1984. - Vol. 121, Is. 2. - P.481-486. - ISSN 0370-1972
Ключевые слова (''Своб.индексиров.''): crystals--x-rays - diffraction--anharmonic thermal atomic vibrations--cubic phase--phase transitions--cesium compounds
Аннотация: Thermal atomic vibrations in the cubic phase of Cs//2NaNdCl//6 single crystal undergoing the structural phase transition (PT) at 138 K are investigated from the data of X-ray diffraction obtained at 278, 218, and 148 K. A significant anisotropy of thermal vibrations and their deviations from harmonic behavior are found for the Cl-atoms of the structure. These atoms displace from their equilibrium positions below PT due to the tilts of the octahedral groups.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Polukhin D. S.
Заглавие : Development of a self-consistent approximation
Место публикации : J. Phys. A: IOP Publishing, 2016. - Vol. 49, Is. 9. - Ст.095004. - ISSN 17518113 (ISSN), DOI 10.1088/1751-8113/49/9/095004
Примечания : Cited References: 43
Предметные рубрики: SUPERCONDUCTING CRITICAL-TEMPERATURE
LATTICE-VIBRATIONS
VERTEX FUNCTION
ELECTRON
Ключевые слова (''Своб.индексиров.''): self-consistent approximation--green's functions--vertex corrections--inhomogeneities--correlations--dynamic susceptibility
Аннотация: A self-consistent approximation of a higher level than the standard self-consistent approximation, known in various fields of physics as the Migdal, Kraichnan or Born self-consistent approximation, is derived taking into account both the first and second terms of the series for the vertex function. In contrast to the standard approximation, the new self-consistent approximation is described by a system of two coupled nonlinear integral equations for the self-energy and the vertex function. In addition to all the diagrams with non-intersecting lines of correlation/interaction taken into account by the standard self-consistent approximation, the new approach takes into account in each term of the Green's function expansion a significant number of diagrams with intersections of these lines. Because of this, the shape, linewidth, and amplitude of the resonance peaks of the dynamic susceptibility calculated in this approximation are much closer to the exact values of these characteristics. The advantage of the new self-consistent approach is demonstrated by the example of calculation of the dynamic susceptibility of waves in an inhomogeneous medium. © 2016 IOP Publishing Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Stolyar S. V., Yakovchuk V. Yu., Chizhik M. V.
Заглавие : Ferromagnetic and spin-wave resonance in exchange-coupled NiFe/Ag/NiFe three-layer structures
Место публикации : TRENDS IN MAGNETISM. - 2011. - Vol. 168-169. - С. 69-72. - ISSN 10120394 (ISSN); 9783037850213 (ISBN), DOI 10.4028/www.scientific.net/SSP.168-169.69
Ключевые слова (''Своб.индексиров.''): acoustic mode--exchange-coupled structures--ferromagnetic resonance--optic mode--spin-wave resonance--three-layer magnetic films--ferromagnetic materials--ferromagnetic resonance--ferromagnetism--magnetic devices--magnetic films--metallic films--spin waves--acoustics--ferromagnetic materials--ferromagnetic resonance--ferromagnetism--lattice vibrations--multilayers--resonance--spin waves--acoustic mode--coupled structures--optic mode--spin-wave resonance--three-layer--exchange coupled--exchange spin waves--optic modes--optical satellites--resonance field--spin wave resonances--three-layer structures--resonance--magnetism
Аннотация: FMR and SWR spectra of exchange-coupled structures NiFe/Ag/NiFe have been investigated. We revealed that the optical satellites of the exchange spin-wave modes are characterized not by the standard Kittel-dependence but rather by their own resonance field dependence on the mode number: Hr opt(n)?n5/2.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jiang X., Wang N., Dong L., Molokeev M. S., Wang S., Liu Y., Guo S., Li W., Huang R., Wu S., Li L., Lin Z.
Заглавие : Integration of negative, zero and positive linear thermal expansion makes borate optical crystals light transmission temperature-independent
Место публикации : Mater. Horizons. - 2022. - Vol. 9, Is. 8. - P.2207-2214. - ISSN 20516347 (ISSN), DOI 10.1039/d2mh00273f
Примечания : Cited References: 50. - The authors acknowledge Zhuohong Yin for useful discussions and Anqi Dai from Guangzhou Design Institute for image processing. This work was supported by the National Scientific Foundations of China (Grants 11974360 and 51872297), the Young Elite Scientist Sponsorship Program by CAST (YESS), Key deployment projects of Rare Earth Research Institute (Grant ZDRW-CN-2021-3), and the CAS Project for Young Scientists in Basic Research (Grants YSBR-024)
Аннотация: Negative and zero thermal expansion (NTE and ZTE) materials are widely adopted to eliminate the harmful effect from the “heat expansion and cool contraction” effect and frequently embrace novel fundamental physicochemical mechanisms. To date, the manipulation of NTE and ZTE materials has mainly been realized by chemical component regulation. Here, we propose another method by making use of the anisotropy of thermal expansion in noncubic single crystals, with maximal tunability from the integration of linear NTE, ZTE and positive thermal expansion (PTE). We demonstrate this concept in borate optical crystals of AEB2O4 (AE = Ca or Sr) to make the light transmission temperature-independent by counterbalancing the thermal expansion and thermo-optics coefficient. We further reveal that such a unique thermal expansion behavior in AEB2O4 arises from the synergetic thermal excitation of bond stretching in ionic [AEO8] and rotation between covalent [BO3] groups. This work has significant implications for understanding the thermal excitation of lattice vibrations in crystals and promoting the functionalization of anomalous thermal expansion materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : KIM P. D., KHVAN D. C.
Заглавие : INTERFERENCE OF ELASTIC-WAVES, EXCITED BY VIBRATIONS OF DOMAIN-WALLS
Место публикации : Zhurnal Tek. Fiz.: MEZHDUNARODNAYA KNIGA, 1983. - Vol. 53, Is. 5. - P947-949. - ISSN 0044-4642
Примечания : Cited References: 10
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pashchenko M. I., Bedarev V. A., Kut'ko V. I., Besmaternykh L. N., Temerov V. L.
Заглавие : IR active vibrations of a TbFe3(BO3)(4) crystal
Разночтения заглавия :авие SCOPUS: IR active vibrations of a TbFe3(BO3)4 crystal
Место публикации : Low Temp. Phys. - 2010. - Vol. 36, Is. 7. - P.638-641. - ISSN 1063-777X, DOI 10.1063/1.3479413; \b Физика низких температур
Примечания : Cited References: 12
Предметные рубрики: GDFE3(BO3)(4)
Аннотация: The IR reflection spectra of a TbFe3(BO3)(4) crystal are measured in the spectral range 200-2000 cm(-1) in E perpendicular to c polarization at temperatures 10 and 300 K. The reflection spectrum so obtained is analyzed and its interpretation is given on the basis of the internal vibrations of the ionic complexes BO33-, FeO69-, and TbO69- of the TbFe3(BO3)(4) crystal. Davydov splitting on the internal vibrational modes at a structural phase transition, which is accompanied by multiplication of the unit cell, was not observed in the experimental spectral range. This is due to the localization of the vibrations of the ionic complexes BO33-, FeO69-, and TbO69- of the TbFe3(BO3)(4) crystal. (c) 2010 American Institute of Physics. [doi:10.1063/1.3479413]
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zinenko V. I., Zamkova N. G., Maksimov E. G., Sofronova S. N.
Заглавие : Lattice dynamics and ferroelectric instability in ordered and disordered PbSc1/2Ta1/2O3 and PbSc1/2Nb1/2O3 solid solutions
Разночтения заглавия :авие SCOPUS: Lattice dynamics and ferroelectric instability in ordered and disordered PbSc1/2Ta1/2O3 and PbSc1/2Nb 1/2O3 solid solutions
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 105, Is. 3. - P617-625. - ISSN 1063-7761, DOI 10.1134/S1063776107090191
Примечания : Cited References: 23
Предметные рубрики: RELAXOR FERROELECTRICS
PHASE-TRANSITION
LOCAL-STRUCTURE
PB(SC1/2NB1/2)O-3
PEROVSKITE
CRYSTALS
Ключевые слова (''Своб.индексиров.''): dipole moment--lattice vibrations--negative ions--phonons--positive ions--solid solutions--dynamic born charges--ferroelectric instabilities--frequency spectra--gordon-kim models--oxygen anions--phonon spectra--ferroelectricity
Аннотация: The dynamic Born charges and the frequency spectra of lattice oscillations in the crystals of ordered and disordered PbSc1/2Ta1/2O3 (PST) and PbSc1/2Nb1/2O3 (PSN) solid solutions have been calculated within the framework of the generalized Gordon-Kim model with allowance for the dipole and quadrupole polarizabilities. The phonon spectra of both compounds contain ferroelectric soft modes. The influence of various interactions on the magnitude of dynamic charges and ferroelectric instability in PSN and PST solid solutions has been studied and it is shown that both these charges and the ferroelectric instability are determined by the competition between long-range dipole-dipole interactions and short-range dipole-charge interactions, the determining role played by the interaction of Nb (Ta) cations and oxygen anions in the Nb-O (Ta-O) bond direction.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Zamkova N. G., Zinenko V. I.
Заглавие : Lattice dynamics, ferroelectric and antiferroeelctric instabilities, and the ferroelectric phase transition in disordered PbB(1/2)' B(1/2)'' O(3) (B ' = Ga, In, Lu; B '' = Nb, Ta) solid solutions
Разночтения заглавия :авие SCOPUS: Lattice dynamics, ferroelectric and antiferroeelctric instabilities, and the ferroelectric phase transition in disordered PbB′ 1/2B″1/2O3 (B′ = Ga, In, Lu; B″ = Nb, Ta) solid solutions
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 106, Is. 6. - P1109-1117. - ISSN 1063-7761, DOI 10.1134/S1063776108060101
Примечания : Cited References: 29
Предметные рубрики: STATISTICAL-MECHANICS
PEROVSKITES
CRYSTALS
ORDER
RELAXOR
BATIO3
PBTIO3
Ключевые слова (''Своб.индексиров.''): crystal lattices--ferroelectricity--lattice vibrations--solids--ferroelectric (barium strontium titanate)--ferroelectric phase transitions--lattice (co)--lattice dynamics--vibration spectrum--ferroelectric materials
Аннотация: The lattice vibration spectra, rf permittivity, and dynamic Born charges of disordered PbB(1/2)'B(1/2)'' O(3) (B' = Ga, In, Lu; B '' = Nb, Ta) solid solutions are calculated in terms of the generalized Gordon-Kim model. All the compounds are found to have soft modes related to the center (Gamma(15)) and boundary point R (R(15)) of the Brillouin zone; the frequencies of these modes are close. The ferroelectric phase transition temperatures and the spontaneous polarization in the ferroelectric phase are calculated for the solid solutions using a model Hamiltonian in the local mode approximation and the Monte Carlo method. These temperatures for the tantalum compounds are found to be higher than for the niobium compounds, and temperature t(s) increases with the atomic number of ion B'. A model where the antiferroelectric state is related to the condensation of modes Gamma(15) and R(15) is proposed. It is found that, for all compounds except for PbSc(1/2)Nb(1/2)O(3) and PbSc(1/2)Ta(1/2)O(3), the ferroelectric phase, which is only related to the condensation of mode R(15), and the antiferroelectric phase have similar energies. In PbIn(1/2)Ta(1/2)O(3), the antiferroelectric phase turns out to be energetically favorable.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M.A.
Заглавие : Manifestation of Vacancies in a Spectrum of Organic Molecular Crystal Lattice Vibrations
Место публикации : arXiv: Cornell University, 2008. - Ст.0802.2480
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Iskhakov R. S., Stolyar S. V., Yakovchuk V.Yu., Chizhik M. V.
Заглавие : Peculiarity of the ferromagnetic and spin-wave resonance in exchangecoupled NiFe/X/NiFe three layer structures (X = Ag, Cu, DyCo)
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.459-462. - ISBN 1, DOI 10.4028/www.scientific.net/SSP.190.459. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): acoustic mode--exchange coupling--ferromagnetic resonance--magnetic films--optic mode--sandwich--spin-wave resonance--mode number--optic modes--optical satellites--resonance field--sandwich--spin-wave mode--spin-wave resonance--three-layer structures--exchange coupling--ferromagnetic resonance--lattice vibrations--magnetic films--magnetic materials--spin waves--resonance
Аннотация: FMR and SWR spectra of exchange-coupled structures NiFe/Cu/NiFe, NiFe/Ag/NiFe and NiFe/DyCo/NiFe have been investigated. We revealed that the optical satellites of the exchange spin-wave modes are characterized not by the standard Kittle-dependence but by their own resonance field dependence on the mode number: Hr opt(n)?n 5/2. В© (2012) Trans Tech Publications.
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