Библиотека института физики им. Л.В. Киренского СО РАН

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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) : Orlov V. A., Patrin G. S., Orlova I. N.
Заглавие : Spectrum of collective vibrations of vortex domain walls in a ferromagnetic nanostripe array
Место публикации : Eur. Phys. J. B. - 2022. - Vol. 95, Is. 3. - Ст.52. - ISSN 14346028 (ISSN), DOI 10.1140/epjb/s10051-022-00315-y
Примечания : Cited References: 32. - The study was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation, theme no. FSRZ-2020-0011
Аннотация: A problem of the spectrum of the collective periodic motion of vortex domain walls in a system of parallel ferromagnetic nanostripe is theoretically solved. The magnetic subsystems of stripes are coupled by the magnetostatic interaction. The effect of the distribution of vortex core polarities and chiralities on the character of periodic motion and the spectrum of collective modes of the nanostripe magnetization is discussed. Analytical expressions for the dispersion law and damping parameter of the collective periodic motion of vortex domain walls are obtained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hoffman A. E.J., Senkovska I., Wieme J., Krylov A. S., Kaskel S., Van Speybroeck V.
Заглавие : Unfolding the terahertz spectrum of soft porous crystals: rigid unit modes and their impact on phase transitions
Место публикации : J. Mater. Chem. A. - 2022. - Vol. 10, Is. 33. - P.17254-17266. - ISSN 20507488 (ISSN), DOI 10.1039/d2ta01678h
Примечания : Cited References: 80. - This work was financially supported by the Fund for Scientific Research Flanders (FWO), the Research Board of the Ghent University (BOF), the Deutsche Forschungsgemeinschaft (DFG, project number 448809307), and the Russian Foundation for Basic Research (RFBR, project number 21-52-12018). The authors thank Kerstin Zechel for sample synthesis. The computational resources and services used in this work were provided by the Flemish Supercomputer Center (VSC), funded by FWO and the Flemish Government
Аннотация: Phase transitions in flexible metal-organic frameworks or soft porous crystals are mediated by low-frequency phonons or rigid-unit modes. The alteration of specific building blocks may change the lattice dynamics of these frameworks, which can influence the phase transition mechanism. In this work, the impact of building block substitution on the rigid-unit modes in flexible MIL-53 analogs with a winerack topology will be investigated via ab initio lattice dynamics calculations. First, the accuracy of the theoretical simulations is verified via experimental Raman measurements, which provide unique fingerprint vibrations in the terahertz range to characterize the phase transition. Following analysis of the low-frequency vibrations shows that there exists a set of universal rigid-unit modes inducing translations and/or rotations of the building blocks. The theoretical results demonstrate that linker substitutions have a large effect on the rigid-unit mode frequencies, whereas this is less so for inorganic chain substitutions. These findings may help to rationally tune the phonon frequencies in soft porous crystals.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S., Denisenko Y. G.
Заглавие : Structural features of Y2O2SO4 via DFT calculations of electronic and vibrational properties
Место публикации : Materials. - 2021. - Vol. 14, Is. 12. - Ст.3246. - ISSN 19961944 (ISSN), DOI 10.3390/ma14123246
Примечания : Cited References: 44
Аннотация: The traditional way for determination of molecular groups structure in crystals is the X-Ray diffraction analysis and it is based on an estimation of the interatomic distances. Here, we report the analysis of structural units in Y2O2SO4 using density functional theory calculations of electronic properties, lattice dynamics and experimental vibrational spectroscopy. The Y2O2SO4 powder was successfully synthesized by decomposition of Y2(SO4)3 at high temperature. According to the electronic band structure calculations, yttrium oxysulfate is a dielectric material. The difference between the oxygen–sulfur and oxygen–yttrium bond nature in Y2O2OS4 was shown based on partial density of states calculations. Vibrational modes of sulfur ions and [Y2O22+] chains were obtained theoretically and corresponding spectral lines observed in experimental Infrared and Raman spectra.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Hoffman A. E. J., Wieme J., Senkovska I., Krylov A. S., Rogge S. M. J., Kaskel S., Speybroeck V. V.
Заглавие : Tuning terahertz vibrations to control flexibility in soft porous crystals
Коллективы : European conference on metal organic frameworks and porous polymers
Место публикации : 4th European conference on metal organic frameworks and porous polymers: Programme and book of abstracts. - 2021. - Ст.P-74 (S3P15). - ISBN 978-83-951195-7-6
Примечания : Cited References: 7
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S., Roginskii E. M., Krylov A. S., Ershov A. A., Voronov V. N.
Заглавие : Structural, electronic and vibrational properties of LaF3 according to density functional theory and Raman spectroscopy
Коллективы : RFBR [17-52-53031, 16-02-00102]; Ministry of Education and Science of the Russian Federation; Krasnoyarsky regional fund of scientific support and scientific-technical activity
Место публикации : J. Phys.: Condens. Matter. - 2018. - Vol. 30, Is. 25. - Ст.255901. - ISSN 0953-8984, DOI 10.1088/1361-648X/aac452. - ISSN 1361-648X(eISSN)
Примечания : Cited References: 39. - The reported study was funded by RFBR according to the research project No. 17-52-53031 and 16-02-00102. It was partially supported by the Ministry of Education and Science of the Russian Federation and the 'Krasnoyarsky regional fund of scientific support and scientific-technical activity'. The computations were performed using facilities of the Computational Centre of the Research Park of St. Petersburg State University.
Предметные рубрики: CRYSTAL-STRUCTURE
NEUTRON-DIFFRACTION
NANOPARTICLES
CONDUCTIVITY
Ключевые слова (''Своб.индексиров.''): laf3--tysonite structure--dft--electronic structure--lattice vibrations--raman spectroscopy
Аннотация: Crystal structure of LaF3 single crystal is refined in tysonite-type trigonal unit cell P c1 using density functional theory calculations and Raman spectroscopy. It is shown that trigonal structure with P c1 space group is more energy-efficient than hexagonal structure with space group P63 cm. Simulated Raman spectra obtained using LDA approximation is in much better agreement with experimental data than that obtained with PBE and PBEsol functionals of GGA. The calculated frequency value of silent mode B 2 in case of hexagonal structure P63 cm was found to be imaginary (unstable mode), thus the energy surface obtains negative curvature with respect to the corresponding normal coordinates of the mode which leads to instability of the hexagonal structure in harmonic approximation. The A 1g line at 214 cm−1 in Raman spectra of LaF3 related to the translation of F2 ions along c axis can be connected with F2 ionic conductivity.
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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 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tanner G., Chappell D. J., Maksimov D. N.
Заглавие : Wave Intensity Distributions in Complex Structures
Коллективы : Workshop on Quantum Chaos and Localisation Phenomena
Место публикации : Acta Phys. Pol. A. - 2011. - Vol. 120, Is. 6A. - P.A172-A177. - ISSN 0587-4246
Примечания : Cited References: 19
Предметные рубрики: STATISTICAL ENERGY ANALYSIS
HIGH-FREQUENCIES
SYSTEMS
VIBRATIONS
Аннотация: The vibro-acoustic response of mechanical structures can in general be well approximated in terms of linear wave equations. Standard numerical solution methods comprise the finite or boundary element method in the low frequency regime and statistical energy analysis in the high-frequency limit. Major computational challenges are posed by the so-called mid-frequency problem - that is, composite structures where the local wavelength may vary by orders of magnitude across the components. Recently, a new approach towards determining the distribution of mechanical and acoustic wave energy in complex built-up structures improving on standard statistical energy analysis has been proposed. The technique interpolates between statistical energy analysis and ray tracing containing both these methods as limiting cases. The method has its origin in studying solutions of wave equation with an underlying chaotic ray-dynamics - often referred to as wave chaos. Within the new theory dynamical energy analysis - statistical energy analysis is identified as a low resolution ray tracing algorithm and typical statistical energy analysis assumptions can be quantified in terms of the properties of the ray dynamics. We have furthermore developed a hybrid statistical energy analysis/finite element method based on random wave model assumptions for the short-wavelength components. This makes it possible to tackle mid-frequency problems under certain constraints on the geometry of the structure. Dynamical energy analysis and statistical energy analysis/finite element method calculations for a range of multi-component model systems will be presented. The results are compared with both statistical energy analysis results and finite element method as well as boundary element method calculations. Dynamical energy analysis emerges as a numerically efficient method for calculating mean wave intensities with a high degree of spatial resolution and capturing long range correlations in the ray dynamics.
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10.

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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