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Вид документа : Однотомное издание
Шифр издания :
Заглавие : International workshop on actual problems of condensed matter physics : Program. Book of abstracts
Выходные данные : Krasnoyarsk, 2017
Колич.характеристики :30 с
Коллективы : Federal Research Center KSC SB RAS, Kirensky Institute of Physics, Siberian Federal Univercity, International Workshop on Actual Problems of Condensed Matter Physics (27 Mar. - 1 Apr. 2017; Krasnoyarsk/ Cheremushki) :
Содержание : Magnetic and transport properties of the epitaxial Fe3Si film on a Si substrate/ I. A. Bondarev. The magnetic anisotropy of the Fe and Fe(1-x)Si(x) thin films depend on/ I. A. Yakovlev [и др.]. Inverted opals as the Josephson networks of weak links/ S. I. Popkov [и др.]. Electronic structure and Fermi surface within the cluster perturbation theory in X-operators representation/ S. Nikolaev, V. I. Kuz'min, S. G. Ovchinnikov. DFT investigation of electronic and optical magnetic properties of one dimensional transition metal halide structuresTmHaI3/ A. S. Fedorov [и др.]. Effect of interatomic exchange interaction on spin crossover and Mott-Hubbard transition under high pressure and the physical properties of the low Earth’s mantle/ S. G. Ovchinnikov [и др.]. Extremely high magnetic-field sensitivity of charge transport in the Mn/SiO2/p-Si hybrid structure/ I. A. Tarasov [и др.]. Marnetic-field sensitivity of charge transport in silicon-based hybrid structures/ N. V. Volkov [et al.]. Fabrication of multi-terminal planar devices based on epitaxial Fe1-xSix films grown on Si(111)/ A. V. Lukyanenko, A. S. Tarasov, I. A. Tarasov [et al.] ; A. V. Luyanenko [и др.]. Magnetic field-driven lateral photovoltaic effect in the Fe/SiO2/p-Si hibrid structure with the Scottky barrier/ M. V. Rautskii [и др.]. Small angle X-ray scattering and atomic structure of aptamer biomolecules/ R. Moryachkov [и др.]. Iron silicides and pure iron epitaxial and highly-textured nanostructures on silicon: growth and their physical properties/ I. A. Tarasov [и др.]. Magnetic nanoparticles and DNA-aptamers conjugates for diagnostics and therapy of cancer/ A. E. Sokolov [и др.]. The microscopic origin of ferromagnetism in Fe silicides/ I. S. Sandalov [и др.].
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Вид документа : Однотомное издание
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Molokeev M. S., Laptash N. M.
Заглавие : Ferroelastic and ferroelectric phase transitions in fluoro- and oxyfluorometallates
Место публикации : Photonic and electronic properties of fluoride materials: Elsevier, 2016. - Chapter 16. - P.355-381. - (Progress in fluorine science series). - , DOI 10.1016/B978-0-12-801639-8.00016-7
Примечания : Cited References: 92. - The reported study was partially supported by RFBR, research project No. 15-02-02009 a
Предметные рубрики: ELASTIC NEUTRON-DIFFRACTION
ORIENTATIONAL DISORDER
CRYSTAL-STRUCTURES
THERMODYNAMIC PROPERTIES
NONCRITICAL PARAMETERS
CUBIC PEROVSKITES
RAMAN-SCATTERING
SINGLE-CRYSTALS
A2BX4 STRUCTURE
HIGH-RESOLUTION
Аннотация: Different degree of structural disorder is one of the main features of many fluoro- and oxyfluorometallates crystallizing in high symmetry structures. The comprehensive study of these compounds (perovskites, elpasolites, pyrochlores, etc.) enabled to determine a great effect of the size and shape as well as crystallographic sites of cationic and anionic species on the mechanism of structural ordering. Ferroelastic and ferroelectric phase transitions of different order, type, and succession can be realized as a result of chemical and hydrostatic pressure change. It was found that the substitution of monoatomic cations for tetrahedral ammonium group was accompanied by rather significant change of electron density distribution, entropy, and phase diagrams. Some compounds studied were considered to be promising solid-state refrigerants owing to the pronounced barocaloric effect resulting from large entropy and baric coefficient of phase transitions.
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Вид документа : Однотомное издание (Препринт)
Шифр издания :
Автор(ы) : Smirnov L. S., Natkaniec I., Sashin I. L., Zalewski S., Simkin V. G., Bogdanov E. V., Laptash N. M., Flerov I. N.
Заглавие : The inelastic incoherent neutron scattering studies OF G0, G1, G2 phase dynamics for (NH4)2W1-XMOXO2F4 solid solutions [Electronic resource] : препринт. № 3-16
Выходные данные : Moscow, 2016
Колич.характеристики :20 с
Примечания : Bibliogr.: 6. - Загл. с титул. экрана :
Аннотация: The investigation of temperature dependence of heat capacity for (NH4)2W1-xMoxO2F4 mixed crystals shows dependence from molybdenum ion concentration as for solid solutions. Two critical temperature are observed on heat capacity dependence as a function of molybdenum concentrations. Dynamics of G0, G1, G2 phases for (NH4)2W1-xMoxO2F4 solid solutions is studied by inelastic incoherent neutron scattering (IINS) for x=0.0, 0.3, 1.0. The IINS intensity contains significant contribution of quasielastic incoherent neutron scattering, which exceeds the IINS intensity in region of G0 phase. The selection of phonon and librational modes is possible only for G2 phase at low temperature 45 K, among which two librational modes are found.Исследование температурной зависимости теплоемкости смешанных кристаллов (NH4)2W1-xMoxO2F4 показывает зависимость от концентрации иона молибдена как для твердых растворов. Для всех концентраций молибдена х на зависимости теплоемкости как функции температуры наблюдаются две критические температуры. Динамика фаз G0, G1, G2 твердых растворов (NH4)2W1-xMoxO2F4 исследована методом неупругого некогерентного расcеяния нейтронов (ННРН) для концентраций x=0.0, 0.3, 1.0. Интенсивность ННРН содержит значительный вклад квазиупругого некогерентного рассеяния нейтронов, который превосходит интенсивность ННРН в области фазы G0. Выделение фононных и либрационных мод возможно только для фазы G2 при низкой температуре, среди которых обнаруживаются две либрационные моды.
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Вид документа : Однотомное издание (Препринт)
Шифр издания :
Автор(ы) : Smirnov L. S., Natkaniec I., Sashin I. L., Zalewski S., Simkin V. G., Bogdanov E. V., Flerov I. N.
Заглавие : Dynamics of G0, G1, G2 phases for (NH4)2W1-xMoxO2F4 mixed crystals, studied by the inelastic incoherent neutron scattering [Electronic resource] : препринт. № 4-15
Выходные данные : Moscow: ИТЭФ, 2015
Колич.характеристики :12 с
Коллективы : Национальный исследовательский центр "Курчатовский институт", Институт теоретической и экспериментальной физики НИЦ "Курчатовский институт"
Примечания : Bibliogr.: 6. - Загл. с титул. экрана :
Аннотация: The investigation of temperature dependence of heat capacity for (NH4)2W1-xMoxO2F4 mixed crystals shows dependence from molybdenum ion concentration. Only one critical temperature is observed on heat capacity dependence as a function of temperature. Dynamics of G0, G1, G2 phases for (NH4)2W1-xMoxO2F4 solid solutions is studied by inelastic incoherent neutron scattering (IINS) for x=0.0, 0.3, 1.0. The IINS intensity contains significant contribution of quasielastic incoherent neutron scattering, which exceeds the IINS intensity in region of G0 phase. The assignment of phonon and librational modes is possible only for G2 phase at temperature 45 K.Исследование температурной зависимости теплоемкости смешанных кристаллов (NH4)2W1-xMoxO2F4 показывает зависимость от концентрации иона молибдена. При концентрации молибдена х=0.30 на зависимости теплоемкости как функции температуры наблюдается только одна критическая температура. Динамика фаз G0, G1, G2 твердых растворов (NH4)2W1-xMoxO2F4 исследована методом неупругого некогерентного расcеяния нейтронов (ННРН) для концентраций x=0.0, 0.3, 1.0. Интенсивность ННРН содержит значительный вклад квазиупругого некогерентного рассеяния нейтронов, который значительно превосходит интенсивность ННРН в области фазы G0. Выделение фононных и либрационных мод проводится для фазы G2 при температуре 45 К.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vtyurin A. N.
Заглавие : Lattice dynamics and phase transitions in eplasolite-like fluorides – Raman scattering study
Коллективы : International Seminar on Ferroelastic Physics, Международный семинар по физике сегнетоэластиков, Российская академия наук, Воронежский государственный технический университет
Место публикации : Ninth international seminar on ferroelastic physics (ISFP-9): book of abstracts/ org. com. I. N. Flerov [et al.] ; progr. com. V. I. Zinenko [et al.]. - 2018. - P.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Столяр, Сергей Викторович, Балашою М., Ярославцев, Роман Николаевич, Артемьева А. С.
Заглавие : Исследование частиц ферригидрита легированного медью и кобальтом методом малоуглового рассеяния нейтронов
Коллективы : Байкальская международная конференция "Магнитные материалы. Новые технологии", "Магнитные материалы. Новые технологии", Байкальская международная конференция, "Magnetic materials. New tecnologies", Baikal International Conference, Иркутский государственный университет
Место публикации : Магнитные материалы. Новые технологии: тез. докл. VIII Байкал. междунар. конф. BICMM-2018/ чл. прогр. ком. R. S. Iskhakov [et al.]. - Иркутск, 2018. - С. 131. - ISBN 978-5-00133-051-6
Примечания : Библиогр.: 1
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Aksenov S. V.
Заглавие : Nonequilibrium Green’s functions in the atomic representation and the problem of quantum transport of electrons through systems with internal degrees of freedom
Место публикации : Theor. Math. Phys. - 2018. - Vol. 194, Is. 2. - P.236-251. - ISSN 00405779 (ISSN), DOI 10.1134/S0040577918020046
Примечания : Cited References: 14. - This research was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund (Grant Nos. 16-02-00073, 16-42-243056, 16-42-242036, and 17-42-240441) and in part (S. V. A.) by the Program for Governmental Support for Young Scientists and Candidates of Science (Grant No. MK-1398.2017.2).
Ключевые слова (''Своб.индексиров.''): nonequilibrium green’s functions--keldysh contour--atomic representation--kinetic equation--inelastic scattering
Аннотация: We develop the theory of quantum transport of electrons through systems with strong correlations between fermionic and internal spin degrees of freedom. The atomic representation for the Hamiltonian of a device and nonequilibrium Green’s functions constructed using the Hubbard operators allow overcoming difficulties in the perturbation theory encountered in the traditional approach because of a larger number of bare scattering amplitudes. Representing the matrix elements of effective interactions as a superposition of terms each of which is split in matrix indices, we obtain a simple method for solving systems of very many equations for nonequilibrium Green’s functions in the atomic representation. As a result, we obtain an expression describing the electron currents in a device one of whose sites is in tunnel coupling with the left contact and the other, with the right contact. We derive closed kinetic equations for the occupation numbers under conditions where the electron flow leads to significant renormalization of them.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Togushova Yu.N.
Заглавие : Effect of the spin-orbit coupling and impurity scattering on the spin resonance peak in three-orbital model for Fe-based superconductors
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2018. - Vol. 11, Is. 1. - P.108-116. - ISSN 19971397 (ISSN), DOI 10.17516/1997-1397-2018-11-1-108-116; Журн. СФУ. Сер. "Математика и физика"
Примечания : Cited References: 27
Аннотация: Here we study a combined effect of the spin-orbit coupling and scattering on the nonmagnetic disorder on the formation of the spin resonance peak in iron-based superconductors. Spin susceptibility is calculated within the random phase approximation. The spin resonance peak becomes broader with the increase of disorder and its frequency also shifts. At the same time, the spin response in the s state is different from that of the s++ state.Исследуется совместное влияние спин-орбитального взаимодействия и рассеяния на немагнитном беспорядке на формирование спин-резонансного пика в сверхпроводниках на основе железа. Спиновая восприимчивость вычислена в приближении хаотических фаз. Спин-резонансный пик становится шире с увеличением беспорядка, и его частота также смещается. В то же время спиновый отклик в состоянии s± отличается от такового в состоянии s++.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Konkolovich A. V., Miskevich A. A., Prishchepa O. O., Shabanov A. V., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : Polarization, transmission, and small-angle scattering of light by a polymer film with elongated droplets of nematic liquid crystal
Место публикации : J. Quant. Spectrosc. Radiat. Transf. - 2019. - Vol. 229. - P.130-144. - ISSN 00224073 (ISSN) , DOI 10.1016/j.jqsrt.2019.03.006
Примечания : Cited References: 29. - The work was performed in the framework of an agreement on inter-academic cooperation between the National Academy of Sciences of Belarus and the Siberian Branch of the Russian Academy of Sciences and supported by the Belarusian Republican Foundation for Fundamental Research (project no. F18RA-003 ). M.N. Krakhalev thanks the Russian Foundation for Basic Research and Government of Krasnoyarsk Territory , Krasnoyarsk Regional Fund of Science, grant no. 18-42-243006.
Аннотация: An optical-mechanical model has been developed to describe the transmittance, polarization and small-angle distribution of light scattered by an uniaxially-stretched polymer film containing the elongated ellipsoidal droplets of nematic liquid crystal. It is based on the approximations of Foldy-Twersky, anomalous diffraction, and single scattering. The spectral dependences of transmittances and polarizing abilities of the polymer dispersed liquid crystal films have been analyzed as well as the small-angle intensity distribution and the polarization degree of scattered light depending on the film thicknesses, refractive index of polymer matrix, sizes of droplets, their anisometry parameters, concentration, polydispersity, and optical axes orientation. The optical characteristics of films with homogeneous and inhomogeneous interfacial anchoring at the surface of liquid crystal droplets have been considered. The transmittance and polarizing ability of the films have been studied as functions of the angular aperture of the system recording scattered light. © 2019 Elsevier Ltd
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Prishchepa O. O., Sutormin V. S., Zyryanov V. Ya.
Заглавие : Polymer dispersed nematic liquid crystal films with conical boundary conditions for electrically controllable polarizers
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-42-243006]; Russian Foundation for Basic Research [16-32-60036]
Место публикации : Opt. Mater. - 2019. - Vol. 89. - P.1-4. - ISSN 0925-3467, DOI 10.1016/j.optmat.2019.01.004. - ISSN 1873-1252(eISSN)
Примечания : Cited References: 38. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (No 18-42-243006); Russian Foundation for Basic Research (No 16-32-60036).
Предметные рубрики: UNIAXIALLY ORIENTED FILMS
ANGLE LIGHT-SCATTERING
SWITCHABLE
Ключевые слова (''Своб.индексиров.''): polymer dispersed liquid crystal films--light polarizer--nematic--droplets--scattering anisotropy--electro-optics
Аннотация: Polymer dispersed nematic liquid crystal (PDNLC) films with conical boundary conditions at the LC-polymer interface are considered. The conical surface anchoring with tilt angle 40° initiates forming the axial-bipolar director configuration inside nematic droplets. This droplet structure exhibits the strong scattering of light polarized parallel to the bipolar axis. In the initial state, the bipolar axes in all droplets are oriented randomly, and therefore PDNLC film scatters a light of any polarization. Electric field applied along the film plane orients the bipolar axes unidirectionally in the whole droplet ensemble, that results in its high polarization-dependent transmittance. Such PDNLC films can be used in the electrically controllable linear polarizers characterized by 89% value of the transmittance for the perpendicular polarized light and high extinction ratio 590:1 at the electric field 0.34 V/μm.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович, Баранник, Алексей Владимирович
Заглавие : Проявление интерференции в электрооптическом отклике нематика в доменной структуре на поверхности поликарбоната
Место публикации : Жидк. крист. и их практич. использ. - 2019. - Т. 19, № 1. - С. 62-69. - ISSN 1991-3966, DOI 10.18083/LCAppl.2019.1.62; Liq. Cryst. Appl. - ISSN 2499–9644
Примечания : Библиогр.: 20. - Работа выполнена при частичном финансировании по интеграционному проекту № 356-2018-0058 СО РАН.
Предметные рубрики: FRIEDERICKSZ THRESHOLD
LAYER
FILM
Ключевые слова (''Своб.индексиров.''): нематический жидкий кристалл--поликарбонат--интерференция света--рассеяние света--электрическое поле--nematic liquid crystal--polycarbonate--light interference--light scattering--electric field
Аннотация: Исследованы интерференционные изменения интенсивности неполяризованного света, распространяющегося через ансамбль жидкокристаллических доменов, сформированных на поверхности поликарбоната. Расчетными методами получены выражения для интенсивности света и фазовой задержки между обыкновенными и необыкновенными лучами с учетом изменения ориентации директора нематика под действием электрического поля. Представлены экспериментальные зависимости интенсивности света от напряжения, согласующиеся с расчетными. Изучено рассеяние света при его распространении через формирующиеся в процессе роста домены. Показано, что интерференционные изменения интенсивности при варьировании напряжения обусловливаются суперпозицией необыкновенных и обыкновенных лучей, проходящих через домены.Interference variations of the intensity of the unpolarized light propagating through the ensemble of liquid crystal domains formed on the polycarbonate surface were investigated. By calculation methods, the expressions for the light intensity and the phase delay between ordinary and extraordinary rays were obtained taking into account the change of the nematic director orientation under the action of the electric field. Experimental dependences of the light intensity on voltage are consistent with the calculated ones. The scattering of light during its propagation through the growing domains was studied. It is shown that the interference intensity changes at varying voltage are caused by the superposition of extraordinary and ordinary rays passing through the domains.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Boev N. M., Izotov A. V., Solovyev P. N., Tyurnev V. V.
Заглавие : Study of the weak field sensor on the resonant microstrip structure with a thin ferromagnetic film
Место публикации : Russ. Phys. J. - 2018. - Vol. 61, Is. 8. - P.1367-1375. - ISSN 10648887 (ISSN), DOI 10.1007/s11182-018-1544-x
Примечания : Cited References: 19. - This research was performed with support of the Russian Ministry of Education and Science, project No. RFMEFI60417X0179.
Ключевые слова (''Своб.индексиров.''): microstrip resonator--thin magnetic film--frequency response--sensor of weak magnetic fields--quality factor--scattering matrix--magnetometer
Аннотация: The paper examines the characteristics of the miniature sensor of weak magnetic fields on the resonant microstrip structure with a thin ferromagnetic film. The authors calculated the frequency response of irregular microstrip resonator containing anisotropic magnetic film in quasi-static approximation. The resonator is connected to transmission lines via coupling capacities. The authors determined the optimal directional angles of the constant magnetic displacement field ensuring maximum sensitivity of the sensor. They examined the impact of angular and amplitude dispersion of uniaxial magnetic anisotropy of thin film upon the sensor characteristics. The regularities determined in this research qualitatively agree with the experimental results.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Konkolovich A. V., Miskevich A. A., Krakhalev M. N., Prishchepa O. O., Shabanov A. V., Zyryanov V. Ya., Loiko V. A.
Заглавие : Model to describe light scattering by polymer film containing droplets with inhomogeneous anchoring of liquid crystal molecules at the polymer-droplet interface: asymmetry effect in the angular distribution of light
Коллективы : Belarusian Republican Foundation for Fundamental Research [F18RA-003]; Krasnoyarsk Regional Science Foundation [18-42-243006]
Место публикации : Liq. Cryst. - 2019. - Vol. 46, Is. 9. - P.1415-1427. - ISSN 0267-8292, DOI 10.1080/02678292.2019.1573331. - ISSN 1366-5855(eISSN)
Примечания : Cited References: 67. - The work was performed in the framework of an agreement on inter-academic cooperation between the National Academy of Sciences of Belarus and the SB RAS. It is supported by the Belarusian Republican Foundation for Fundamental Research (Project No. F18RA-003). MN Krakhalev thanks the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory and the Krasnoyarsk Regional Science Foundation (grant No. 18-42-243006).
Предметные рубрики: IONIC MODIFICATION
NEMATIC DROPLETS
COHERENT TRANSMITTANCE
Аннотация: A model to describe light scattering by polymer film containing of monolayer of liquid crystal droplets with inhomogeneous anchoring of liquid crystal molecules at the polymer-droplet interface is developed. It is based on the interference approximation of the wave scattering theory. The director field distribution in the droplet volume is determined by solving the free energy density minimization problem using the relaxation method. The spatial distribution of droplets in the layer is described by the hard disks model. The amplitude scattering matrices of individual droplets are found in the anomalous diffraction approximation. The algorithm for numerical analysis of the characteristics of light scattered in a polymer film containing droplets at homogeneous and inhomogeneous surface anchoring is described in terms of the partial filling factors of the monolayer film. Electrically controllable symmetry breaking effect of angular distribution of light scattered by films containing droplets with inhomogeneous anchoring at the polymer-droplet interface is described and experimentally confirmed.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M.
Заглавие : Optical characteristics of liquid-crystal domains probed by a focused laser beam
Коллективы : Russian Foundation for Basic Research (RFBR) [15-02-06924, 16-53-00073]; Siberian Branch, Russian Academy of Sciences (SB RAS) [2P 0356-2015-0410, 0356-2015-041]
Место публикации : J. Opt. Technol. - 2018. - Vol. 85, Is. 1. - P.22-25. - ISSN 1070-9762, DOI 10.1364/JOT.85.000022. - ISSN 1091-0786(eISSN)
Примечания : Cited References:12. - Russian Foundation for Basic Research (RFBR) (15-02-06924, 16-53-00073); Siberian Branch, Russian Academy of Sciences (SB RAS) (2P 0356-2015-0410, 0356-2015-041).
Предметные рубрики: LIGHT-SCATTERING
POLYMER SURFACE
Аннотация: A technique for determining the optical characteristics of the domain structures of nematic liquid crystals using a focused laser beam is presented. The dependences of the intensity of polarized light on the voltage of a separate nematic domain formed by a polycarbonate surface in the presence of a magnetic field are obtained. It is shown that the optical characteristics cannot be interpreted within the framework of the concept of light scattering, which is suitable in the case of an ensemble of domains probed by a wide laser beam. The analysis of the results is based on the assumption of gradient index optics.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vtyurin A. N.
Заглавие : Raman scattering study of structural phase transitions
Коллективы : Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, Young scientists school on the spectroscopic, Физико-технический институт им. А.Ф. Иоффе РАН, Санкт-Петербургский политехнический университет им. Петра Великого
Место публикации : Joint 14th Rus./CIS/Baltic/Japan Symp. on Ferroelectricity (RCBJSF)/ Young sci. school on the spect. studies of critical dynamics at struct. phase trans.: Abstract book/ org. comm. A. N. Vtyurin ; progr. comm. I. N. Flerov. - 2018. - P.208. - ISBN 978-5-9651-1144-2
Примечания : Cited References:
Материалы конференции
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Scattering plane waves by a dielectric cylinder with periodically modulated permittivity at oblique incidence
Коллективы : Ministry of Education and Science of Russian Federation [3.1845.2017]; Russian Foundation for Basic Research [16-02-00314]
Место публикации : Phys. Rev. A. - 2018. - Vol. 97, Is. 6. - Ст.063856. - ISSN 2469-9926, DOI 10.1103/PhysRevA.97.063856. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 24. - We acknowledge discussions with A. A. Bogdanov and D. N. Maksimov. This paper was partially supported by Ministry of Education and Science of Russian Federation (State Contract No. 3.1845.2017) and Russian Foundation for Basic Research Grant No. 16-02-00314.
Предметные рубрики: BOUND-STATES
FANO RESONANCE
LIGHT LINE
CONTINUUM
ARRAYS
Аннотация: For scattering of electromagnetic waves by a dielectric cylinder with periodically modulated permittivity we focus on the vicinity of the frequency of the wave with regard to the eigenfrequencies of bound states in the continuum. Then response of the cylinder becomes extremely sensitive to the angle of incidence and polarization of the plane wave. The cross section of the scattering of electromagnetic waves with mixed polarization undergoes crucial change from the Bragg shape to the Fano shape by rotation of the polarization that paves a way to tuning of Fano resonances by an external source.
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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krylov A. S., Vtyurin A. N., Shmygol I. V., Ageev A. G.
Заглавие : Tetragonal-tetragonal phase transition in CsScF4 crystal. Study of lattice dynamics and ramsn scattering spectra
Коллективы : Институт физики им. Х. И. Амирханова Дагестанского научного центра РАН, Дагестанский государственный университет, "Фазовые переходы и критические явления в конденсированных средах", международная конференция
Место публикации : Фаз. переходы и критич. явл. в конденс. средах: программа межд. конф./ предс. орг. ком. К. С. Александров. - Махачкала, 1998. - Ст.Б2-7. - P.12
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shestakov V. A., Korshunov M. M., Togushova Yu.N., Efremov D. V., Dolgov O. V.
Заглавие : Details of the disorder-induced transition between s± and s++ states in the two-band model for Fe-based superconductors
Коллективы : Russian Foundation for Basic Research [16-02-00098]; Government Support of the Leading Scientific Schools of the Russian Federation [NSh-7559.2016.2]; 'BASIS' Foundation for Development of Theoretical Physics and Mathematics
Место публикации : Supercond. Sci. Technol. - 2018. - Vol. 31, Is. 3. - Ст.034001. - ISSN 0953-2048, DOI 10.1088/1361-6668/aaa501. - ISSN 1361-6668(eISSN)
Примечания : Cited References:62. - We are grateful to P D Grigor'ev and M V Sadovskii for useful discussions. This work was supported in part by the Russian Foundation for Basic Research (grant 16-02-00098) and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2). MMK and VAS acknowledge the support of the 'BASIS' Foundation for Development of Theoretical Physics and Mathematics.
Предметные рубрики: IRON-BASED SUPERCONDUCTORS
HIGH-TEMPERATURE SUPERCONDUCTIVITY
PAIRING
Ключевые слова (''Своб.индексиров.''): unconventional superconductors--iron pnictides--iron chalcogenides--impurity scattering
Аннотация: IIrradiation of superconductors with different particles is one of many ways to investigate the effects of disorder. Here we study the disorder-induced transition between s ± and s ++ states in the two-band model for Fe-based superconductors with nonmagnetic impurities. Specifically, we investigate the important question of whether the superconducting gaps during the transition change smoothly or abruptly. We show that the behavior can be of either type and is controlled by the ratio of intraband to interband impurity scattering potentials, and by a parameter σ, that represents scattering strength and ranges from zero (Born approximation) to one (unitary limit). For the pure interband scattering potential and the scattering strength σ ≲ 0.11, the s ± → s ++ transition is accompanied by steep changes in the gaps, while for larger values of σ, the gaps change smoothly. The behavior of the gaps is characterized by steep changes at low temperatures, T˂ 0.1Tc0 with Tc0 being the critical temperature in the clean limit, otherwise it changes gradually. The critical temperature Tc is always a smooth function of the scattering rate in spite of the steep changes in the behavior of the gaps.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pavlovskiy M. S., Shaykhutdinov K. A., Wu L. S., Ehlers G., Temerov V. L., Gudim I. A., Shinkorenko A. S., Podlesnyak A.
Заглавие : Observation of soft phonon mode in TbFe3(BO3)4 by inelastic neutron scattering
Коллективы : Laboratory Directed Research and Development Program of Oak Ridge National Laboratory; RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-243039]
Место публикации : Phys. Rev. B. - 2018. - Vol. 97, Is. 5. - Ст.054313. - ISSN 2469-9950, DOI 10.1103/PhysRevB.97.054313. - ISSN 2469-9969(eISSN)
Примечания : Cited References:40. - This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. L.S.W. was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US DOE. The work was funded by RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund according to Research Project No. 16-42-243039.
Предметные рубрики: STRUCTURAL PHASE-TRANSITIONS
SINGLE-CRYSTAL
SPECTROSCOPY
Аннотация: The phonon dispersion in terbium iron borate TbFe3(BO3)4 has been measured by inelastic neutron scattering in a temperature range 180˂T˂350 K through the displacive structural transition at TS=192.5K and studied by ab initio calculations. Significant, but not complete, softening of the transverse acoustic (TA) branch has been observed at the corner of the Brillouin zone (Λ point) at temperatures T⪆TS, in full agreement with theoretical calculations. The TA soft mode undergoes considerable broadening at the Λ point near the transition temperature that can be attributed to the anharmonic interference between transverse acoustic and optical modes.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nikitin S. E., Wu L. S., Sefat A. S., Shaykhutdinov K. A., Lu Z., Meng S., Pomjakushina, E., V, Conder K., Ehlers G., Lumsden M. D., Kolesnikov, A., I, Barilo S., Guretskii S. A., Inosov D. S., Podlesnyak A.
Заглавие : Decoupled spin dynamics in the rare-earth orthoferrite YbFeO3: Evolution of magnetic excitations through the spin-reorientation transition
Коллективы : US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division; German Research Foundation (DFG) [SFB 1143]; International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM); Laboratory Directed Research and Development Program of Oak Ridge National Laboratory; BFFR [F18KI-022]
Место публикации : Phys. Rev. B. - 2018. - Vol. 98, Is. 6. - Ст.064424. - ISSN 2469-9950, DOI 10.1103/PhysRevB.98.064424. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 70. - We would like to thank A. Sukhanov, O. Stockert, and P. Thalmeier for useful discussions. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. Part of this work was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. D.S.I. acknowledges funding by the German Research Foundation (DFG) through the Collaborative Research Center SFB 1143 at the TU Dresden (project C03). S.E.N. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). L.S.W. was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US DOE. S.B. and S.A.G. are supported by BFFR, Grant No. F18KI-022
Предметные рубрики: MAGNON BOUND-STATES
ANTIFERROMAGNETIC CHAIN
NEUTRON-SCATTERING
Аннотация: In this paper, we present a comprehensive study of magnetic dynamics in the rare-earth orthoferrite YbFeO3 at temperatures below and above the spin-reorientation (SR) transition TSR=7.6K, in magnetic fields applied along the a,b, and c axes. Using single-crystal inelastic neutron scattering, we observed that the spectrum of magnetic excitations consists of two collective modes well separated in energy: 3D gapped magnons with a bandwidth of ∼60meV, associated with the antiferromagnetically (AFM) ordered Fe subsystem, and quasi-1D AFM fluctuations of ∼1meV within the Yb subsystem, with no hybridization of those modes. The spin dynamics of the Fe subsystem changes very little through the SR transition and could be well described in the frame of semiclassical linear spin-wave theory. On the other hand, the rotation of the net moment of the Fe subsystem at TSR drastically changes the excitation spectrum of the Yb subsystem, inducing the transition between two regimes with magnon and spinonlike fluctuations. At TTSR, the Yb spin chains have a well defined field-induced ferromagnetic (FM) ground state, and the spectrum consists of a sharp single-magnon mode, a two-magnon bound state, and a two-magnon continuum, whereas at TTSR only a gapped broad spinonlike continuum dominates the spectrum. In this work we show that a weak quasi-1D coupling within the Yb subsystem JYb-Yb, mainly neglected in previous studies, creates unusual quantum spin dynamics on the low-energy scales. The results of our work may stimulate further experimental search for similar compounds with several magnetic subsystems and energy scales, where low-energy fluctuations and underlying physics could be “hidden” by a dominating interaction.
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