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Study of the weak field sensor on the resonant microstrip structure with a thin ferromagnetic film / B. A. Belyaev [et al.] // Russ. Phys. J. - 2018. - Vol. 61, Is. 8. - P. 1367-1375, DOI 10.1007/s11182-018-1544-x. - Cited References: 19. - This research was performed with support of the Russian Ministry of Education and Science, project No. RFMEFI60417X0179. . - ISSN 1064-8887
Кл.слова (ненормированные):
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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Публикация на русском языке Исследование датчика слабых магнитных полей на резонансной микрополосковой структуре с тонкой ферромагнитной пленкой [Текст] / Б. А. Беляев [и др.] // Изв. вузов. Физика. - 2018. - Т. 61 № 8. - С. 3-10

Держатели документа:
L. V. Kirensky Institute of Physics of the Krasnoyarsk Research Center of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Boev, N. M.; Боев, Никита Михайлович; Izotov, A. V.; Изотов, Андрей Викторович; Solovyev, P. N.; Соловьев, Платон Николаевич; Tyurnev, V. V.; Тюрнев, Владимир Вениаминович
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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 / A. V. Konkolovich [et al.] // Liq. Cryst. - 2019. - Vol. 46, Is. 9. - P. 1415-1427, DOI 10.1080/02678292.2019.1573331. - 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). . - ISSN 0267-8292. - ISSN 1366-5855

РУБ Chemistry, Multidisciplinary + Crystallography + Materials Science, Multidisciplinary
Рубрики:
IONIC MODIFICATION
NEMATIC DROPLETS
COHERENT TRANSMITTANCE
Кл.слова (ненормированные):
Polymer-dispersed liquid crystal film -- liquid crystal droplets -- light transmission -- angular distribution of scattered light
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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Держатели документа:
Natl Acad Sci Belarus, Stepanov Inst Phys, Minsk, BELARUS.
Russian Acad Sci, Fed Res Ctr, Krasnoyarsk Sci Ctr, Siberian Branch,Kirensky Inst Phys, Krasnoyarsk, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk, Russia.

Доп.точки доступа:
Konkolovich, A. V.; Miskevich, A. A.; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Shabanov, A. V.; Шабанов, Александр Васильевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Loiko, V. A.; Belarusian Republican Foundation for Fundamental Research [F18RA-003]; Krasnoyarsk Regional Science Foundation [18-42-243006]
}
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Vtyurin, A. N.
Lattice dynamics and phase transitions in eplasolite-like fluorides – Raman scattering study / A. N. Vtyurin // 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.

Материалы конференции,
Материалы конференции

Доп.точки доступа:
Zinenko, V. I. \progr. com.\; Зиненко, Виктор Иванович; Flerov, I. N. \org. com.\; Флёров, Игорь Николаевич; Втюрин, Александр Николаевич; International Seminar on Ferroelastic Physics(9 ; 2018 ; Sept. ; 12-15 ; Voronezh); Международный семинар по физике сегнетоэластиков(9(14) ; 2018 ; сент. ; 12-15 ; Воронеж); Российская академия наук; Воронежский государственный технический университет
}
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Val'kov, V. V.
Nonequilibrium Green’s functions in the atomic representation and the problem of quantum transport of electrons through systems with internal degrees of freedom / V. V. Val’kov, S. V. Aksenov // Theor. Math. Phys. - 2018. - Vol. 194, Is. 2. - P. 236-251, DOI 10.1134/S0040577918020046. - 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). . - ISSN 0040-5779
Кл.слова (ненормированные):
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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Публикация на русском языке Вальков, Валерий Владимирович. Неравновесные функции Грина в атомном представлении и проблема квантового транспорта электронов через системы с внутренними степенями свободы [Текст] / В. В. Вальков, С. В. Аксенов // Теор. и мат. физика. - 2018. - Т. 194 № 2. - С. 277-294

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Вальков, Валерий Владимирович
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    Korshunov, M. M.
    Effect of the spin-orbit coupling and impurity scattering on the spin resonance peak in three-orbital model for Fe-based superconductors / M. M. Korshunov, Yu. N. Togushova // J. Sib. Fed. Univ. Math. Phys. - 2018. - Vol. 11, Is. 1. - P. 108-116 ; Журн. СФУ. Сер. "Математика и физика", DOI 10.17516/1997-1397-2018-11-1-108-116. - Cited References: 27 . - ISSN 1997-1397
   Перевод заглавия: Влияние спин-орбитального взаимодействия и рассеяния на примесях на спин-резонансный пик в трёхорбитальной модели сверхпроводников на основе железа
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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Доп.точки доступа:
Togushova, Yu.N.; Тогушова, Ю.Н.; Коршунов, Максим Михайлович

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    Паршин, Александр Михайлович.
    Проявление интерференции в электрооптическом отклике нематика в доменной структуре на поверхности поликарбоната / А. М. Паршин, А. В. Баранник // Жидк. крист. и их практич. использ. - 2019. - Т. 19, № 1. - С. 62-69 ; Liq. Cryst. Appl., DOI 10.18083/LCAppl.2019.1.62. - Библиогр.: 20. - Работа выполнена при частичном финансировании по интеграционному проекту № 356-2018-0058 СО РАН. . - ISSN 1991-3966. - ISSN 2499-–964
   Перевод заглавия: Interference phenomenon in electro-optic response of nematic in domain structure on polycarbonate surface

РУБ Crystallography
Рубрики:
FRIEDERICKSZ THRESHOLD
LAYER
FILM
Кл.слова (ненормированные):
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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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, 50 Akademgorodok, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, 79 Svobodny Ave, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Баранник, Алексей Владимирович; Barannik, A. V.; Parshin, A. M.

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Manifestations of Structural Phase Transitions in a Rb2KLuF6 Crystal in Its Raman Spectra / A. S. Krylov [et al.] // Opt. Spectrosc. - 2019. - Vol. 126, Is. 4. - P. 341-345, DOI 10.1134/S0030400X1904012X. - Cited References: 27. - This work was supported by the Russian Foundation for Basic Research, project nos. 16-02-00102, 18-02-00754. . - ISSN 0030-400X. - ISSN 1562-6911

РУБ Optics + Spectroscopy
Рубрики:
SCATTERING
   ELPASOLITES
   LUMINESCENCE
   TRANSFORMATIONS
   FLUORIDES
Аннотация: The Raman spectra of an Rb2KLuF6 crystal are studied in the temperature range from 8 to 375 K, which includes two phase transitions: one of which proceeds from a cubic to a tetragonal phase, while the other transition takes place from a tetragonal to a monoclinic phase. An analysis of the temperature dependences of parameters of spectral lines shows that the former transition is of the second kind, while the latter transition is of the first kind, close to the tricritical point. It is shown that the structural phase transitions in the Rb2KLuF6 double perovskite are not associated with disordering. The former transition is associated with rotations of LuF6 octahedra around the fourth-order axis, while the latter transition is related with rotations of octahedra and displacements of rubidium ions.

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Публикация на русском языке Проявление структурных фазовых переходов в кристалле Rb2KLuF6 в спектрах комбинационного рассеяния света [Текст] / А. С. Крылов [и др.] // Оптика и спектроскопия. - 2019. - Т. 126 Вып. 4. - С. 423-427

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Voronov, V. N.; Воронов, Владимир Николаевич; Krylova, S. N.; Крылова, Светлана Николаевна; Russian Foundation for Basic Research [16-02-00102, 18-02-00754]
}
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Kniazev, I.
Magnetic transition study in e-Fe2O3 by conventional Mössbauer spectroscopy and synchrotron radiation source / Yu. V. Knyazev // NRS workshop : list of posters. - 2019. - Ст. 9

Материалы семинара,
Материалы семинара

Доп.точки доступа:
Князев, Юрий Владимирович; EBS Workshop on Nuclear Resonance Scattering(2019 ; March. 11-12 ; Grenoble, France)
}
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    Two-Magnon Relaxation Processes in Nanocrystalline Thin Magnetic Films / A. V. Izotov [et al.] // Russ. Phys. J. - 2019. - Vol. 61, Is. 12. - P. 2313-2320, DOI 10.1007/s11182-019-01673-4. - Cited References: 25. - This research was done with support of the Russian Ministry of Education and Science, task No. 3.1031.2017/PCh. . - ISSN 1064-8887. - ISSN 1573-9228
Рубрики:
FERROMAGNETIC-RESONANCE LINEWIDTH
   MICROMAGNETIC CALCULATION
   SCATTERING
Кл.слова (ненормированные):
micromagnetic simulation -- nanocrystallites -- random magnetic anisotropy -- ferromagnetic resonance -- microwave frequencies -- two-magnon relaxation process
Аннотация: Numerical analysis of the micromagnetic model was used to reveal the ‘resonance’ feature of relaxation processes in nanocrystalline thin magnetic films. This feature manifests itself in the form of sharp broadening of the ferromagnetic resonance (FMR) line at a certain frequency f1 depending on magnetic characteristics of the film, and is observed only in films the thickness of which exceeds some threshold value dmin. Sharp broadening of the FMR line is accompanied by significant shift of the resonance field, whereas the shift value changes the sign at frequency ~ f1. It was shown analytically that the nature of observed effects is associated with the two-magnon process of spin waves scattering on quasi-periodic magnetic microstructure – magnetization ‘ripple’. Obtained expressions for the threshold value of film thickness dmin and frequency of maximum broadening of FMR line f1 agree well with the results of numerical computation of micromagnetic model.

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Публикация на русском языке Особенности двухмагнонных процессов релаксации в нанокристаллических тонких магнитных пленках [Текст] / А. В. Изотов [и др.] // Изв. вузов. Физика. - 2018. - Т. 61 № 12. - С. 153-159

Держатели документа:
Siberian Fed Univ, Krasnoyarsk, Russia.
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr KSC, Siberian Branch, Krasnoyarsk, Russia.

Доп.точки доступа:
Izotov, A. V.; Изотов, Андрей Викторович; Belyaev, B. A.; Беляев, Борис Афанасьевич; Solovev, P. N.; Соловьев, Платон Николаевич; Boev, N. M.; Боев, Никита Михайлович; Russian Ministry of Education and Science [3.1031.2017/PCh]
}
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10.

    Polarization, transmission, and small-angle scattering of light by a polymer film with elongated droplets of nematic liquid crystal / V. A. Loiko [et al.] // J. Quant. Spectrosc. Radiat. Transf. - 2019. - Vol. 229. - P. 130-144, DOI 10.1016/j.jqsrt.2019.03.006. - 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. . - ISSN 0022-4073
   Перевод заглавия: Поляризация, пропускание и малоугловое рассеяние света полимерной пленкой с вытянутыми каплями нематического жидкого кристалла
Кл.слова (ненормированные):
Polarization -- Polymer-dispersed liquid crystal -- Uniaxially stretched film -- Liquid crystal droplet -- Light transmittance -- Light scattering anisotropy
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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Держатели документа:
Stepanov Institute of Physics, National Academy of Sciences of Belarus, Niezalezhnastsi avenue 68-2, Minsk, 220072, Belarus
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center”, Siberian Branch, Russian Academy of Sciences, Academgorodok 50(38), Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Loiko, V. A.; Konkolovich, A. V.; Miskevich, A. A.; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Shabanov, A. V.; Шабанов, Александр Васильевич; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
}
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11.

    Polymer dispersed nematic liquid crystal films with conical boundary conditions for electrically controllable polarizers / M. N. Krakhalev [et al.] // Opt. Mater. - 2019. - Vol. 89. - P. 1-4, DOI 10.1016/j.optmat.2019.01.004. - 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). . - ISSN 0925-3467. - ISSN 1873-1252
   Перевод заглавия: Пленки капсулированного полимером нематического жидкого кристалла с коническими граничными условиями для электроуправляемых поляризаторов

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
UNIAXIALLY ORIENTED FILMS
ANGLE LIGHT-SCATTERING
SWITCHABLE
Кл.слова (ненормированные):
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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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Krakhalev, M. N.; Крахалев, Михаил Николаевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; 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]
}
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12.

    Исследование частиц ферригидрита легированного медью и кобальтом методом малоуглового рассеяния нейтронов / С. В. Столяр [и др.] // Магнитные материалы. Новые технологии : тез. докл. VIII Байкал. междунар. конф. BICMM-2018 / чл. прогр. ком. R. S. Iskhakov [et al.]. - Иркутск, 2018. - С. 131. - Библиогр.: 1 . - ISBN 978-5-00133-051-6
   Перевод заглавия: Investigation of copper-dopped and cobalt-dopped ferrigydrite nanoparticles by the method of small-angle neutron scattering

РИНЦ,
Материалы конференции,
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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Iskhakov, R. S. \чл. прогр. ком.\; Исхаков, Рауф Садыкович; Ovchinnikov, S. G. \чл. прогр. ком.\; Овчинников, Сергей Геннадьевич; Aplesnin, S. S. \чл. прогр. ком.\; Аплеснин, Сергей Степанович; Balaev, D. A. \чл. прогр. ком.\; Балаев, Дмитрий Александрович; Столяр, Сергей Викторович; Stolyar, S. V.; Балашою, М.; Ярославцев, Роман Николаевич; Yaroslavtsev, R. N.; Артемьева, А. С.; Байкальская международная конференция "Магнитные материалы. Новые технологии"(8 ; 2018 ; авг. ; 24-28 ; Иркутск); "Магнитные материалы. Новые технологии", Байкальская международная конференция(8 ; 2018 ; авг. ; 24-28 ; Иркутск); "Magnetic materials. New tecnologies", Baikal International Conference(8 ; 2018 ; Aug. 24-28 ; Irkutsk); Иркутский государственный университет
}
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13.

Raman scattering study of structural phase transitions / A. N. Vtyurin // 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. - Cited References: . - ISBN 978-5-9651-1144-2

Материалы конференции

Доп.точки доступа:
Vtyurin, A. N. \org. comm.\; Втюрин, Александр Николаевич; Flerov, I. N. \progr. comm.\; Флёров, Игорь Николаевич; Vtyurin, A. N.; Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(14 ; May 14-18, 2018 ; St. Perersburg); Young scientists school on the spectroscopic(May 14-18, 2018 ; St. Perersburg); Физико-технический институт им. А.Ф. Иоффе РАН; Санкт-Петербургский политехнический университет им. Петра Великого
}
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14.

Bulgakov, E. N.
Scattering plane waves by a dielectric cylinder with periodically modulated permittivity at oblique incidence / E. N. Bulgakov, A. F. Sadreev // Phys. Rev. A. - 2018. - Vol. 97, Is. 6. - Ст. 063856, DOI 10.1103/PhysRevA.97.063856. - 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. . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
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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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич; Ministry of Education and Science of Russian Federation [3.1845.2017]; Russian Foundation for Basic Research [16-02-00314]
}
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15.

Parshin, A. M.
Optical characteristics of liquid-crystal domains probed by a focused laser beam / A. M. Parshin // J. Opt. Technol. - 2018. - Vol. 85, Is. 1. - P. 22-25, DOI 10.1364/JOT.85.000022. - 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). . - ISSN 1070-9762. - ISSN 1091-0786

РУБ Optics
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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Публикация на русском языке Паршин, Александр Михайлович. Оптические характеристики жидкокристаллических доменов, зондируемых сфокусированным лазерным лучом [Текст] / А. М. Паршин // Оптич. журн. - 2018. - Т. 85 Вып. 1. - С. 29-33

Держатели документа:
Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Branch, Fed Res Ctr,Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Паршин, Александр Михайлович; 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]
}
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16.

    Details of the disorder-induced transition between s± and s++ states in the two-band model for Fe-based superconductors / V. A. Shestakov [et al.] // Supercond. Sci. Technol. - 2018. - Vol. 31, Is. 3. - Ст. 034001, DOI 10.1088/1361-6668/aaa501. - 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. . - ISSN 0953-2048. - ISSN 1361-6668
   Перевод заглавия: Детали вызванного беспорядком перехода между s± и s++ состояниями в двузонной модели сверхпроводников на основе железа

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
IRON-BASED SUPERCONDUCTORS
HIGH-TEMPERATURE SUPERCONDUCTIVITY
PAIRING
Кл.слова (ненормированные):
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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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Leibniz Inst Festkorper & Werkstoffforsch, D-01069 Dresden, Germany.
Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
RAS, PN Lebedev Phys Inst, Moscow 119991, Russia.

Доп.точки доступа:
Shestakov, V. A.; Шестаков, Вадим Андреевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Togushova, Yu.N.; Тогушова Ю. Н.; Efremov, D. V.; Dolgov, O. V.; 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
}
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17.

Observation of soft phonon mode in TbFe3(BO3)4 by inelastic neutron scattering / M. S. Pavlovskiy [et al.] // Phys. Rev. B. - 2018. - Vol. 97, Is. 5. - Ст. 054313, DOI 10.1103/PhysRevB.97.054313. - 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. . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Physics, Condensed Matter
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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Держатели документа:
Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk 660036, Russia.
Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA.
Oak Ridge Natl Lab, Neutron Technol Div, Oak Ridge, TN 37831 USA.

Доп.точки доступа:
Pavlovskiy, M. S.; Павловский, Максим Сергеевич; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Wu, L. S.; Ehlers, G.; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Shinkorenko, A. S.; Шинкоренко, Алексей Сергеевич; Podlesnyak, A.; 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]
}
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18.

The alternating-sign magnetoresistance of polycrystalline manganese chalcogenide films / S. S. Aplesnin [et al.] // Semicond. Sci. Technol. - 2018. - Vol. 33, Is. 8. - Ст. 085006, DOI 10.1088/1361-6641/aace44. - Cited References: 33. - The reported study was funded by Russian Foundation for Basic Research (RFBR) according to the research project No 18-52-00009 Bel_a; No 18-32-00079 mol_a; No 18-42-240001 r_a; the state order No 3.5743.2017/6.7. . - ISSN 0268-1242. - ISSN 1361-6641

РУБ Engineering, Electrical & Electronic + Materials Science,
Рубрики:
NEUTRON-SCATTERING
   SURFACE-STATES
   MNTE
   CONDUCTIVITY
   MECHANISM
Кл.слова (ненормированные):
polycrystalline films -- magnetoresistance -- impedance -- polaron -- magnetic -- properties -- thermoelectric
Аннотация: The correlation between the dc and ac electrical resistance and the structural, magnetic, and thermoelectric properties of polycrystalline MnSe1−X Te Х (0.3 ≤ X ≤ 0.4) manganese chalcogenide films in the temperature range of 80–400 K has been investigated. Inhomogeneous electronic states and transitions between them accompanied by structural lattice deformations have been found at temperatures including the Neel temperature region. The magnetic susceptibility maximum above the Neel temperature in a magnetic field of 8.6 kOe has been observed. Temperature ranges of the coexistence of two types of electrically inhomogeneous states have been established by impedance spectroscopy in the frequency range of 0.1–1000 kHz and the change of the hopping conductivity for diffusion one accompanied by the magnetic susceptibility minimum has been found. The magnetoresistance in magnetic fields of up to 12 kОе has been established. It has been revealed that the thermopower and magnetoresistance change its sign upon heating. The experimental data are explained using a spin polaron model with the localization of polarons and formation of the electron phase-separation. The alternation of magnetoresistance in sign is attributed to the ferromagnetic orbital ordering of electrons and the negative magnetoresistance is explained by suppression of spin fluctuations in a magnetic field.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50,Bld 38, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarskii Rabochi Ave 31, Krasnoyarsk 660014, Russia.
Sci Pract Mat Res Ctr NAS Belarus, P Brovki Str 19, Minsk 220072, BELARUS.

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Romanova, O. B.; Романова, Оксана Борисовна; Sitnikov, M. N.; Kretinin, V. V.; Galyas, A., I; Yanushkevich, K., I; Russian Foundation for Basic Research (RFBR) [18-52-00009 Bel_a, 18-32-00079 mol_a, 18-42-240001 r_a]; [3.5743.2017/6.7]
}
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19.

    Shestakov, V. A.
    Temperature-dependent s± ↔ s++ transitions in the multiband model for Fe-based superconductors with impurities / V. A. Shestakov, M. M. Korshunov, O. V. Dolgov // Symmetry. - 2018. - Vol. 10, Is. 8. - Ст. 323, DOI 10.3390/sym10080323. - Cited References: 50. - This work was supported in part by the Russian Foundation for Basic Research (grant 16-02-00098), Presidium of RAS Program for the Fundamental Studies #12, and "BASIS" Foundation for Development of Theoretical Physics and Mathematics. MMK acknowledges support by the Gosbudget program #0356-2017-0030. . - ISSN 2073-8994
   Перевод заглавия: Зависящие от температуры переходы s± ↔ s++ в многозонной модели сверхпроводников на основе железа с примесями

РУБ Multidisciplinary Sciences
Рубрики:
IRON-BASED MATERIALS
Кл.слова (ненормированные):
unconventional superconductors -- iron pnictides -- iron chalcogenides -- impurity scattering
Аннотация: We study the dependence of the superconducting gaps on both the disorder and the temperature within the two-band model for iron-based materials. In the clean limit, the system is in the s± state with sign-changing gaps. Scattering by nonmagnetic impurities leads to the change of the sign of the smaller gap, resulting in a transition from the s± to the s++ state with the sign-preserving gaps. We show here that the transition is temperature-dependent. Thus, there is a line of s±→s++ transition in the temperature–disorder phase diagram. There is a narrow range of impurity scattering rates, where the disorder-induced s±→s++ transition occurs at low temperatures, but then the low-temperature s++ state transforms back to the s± state at higher temperatures. With increasing impurity scattering rate, the temperature of such s++→s± transition shifts to the critical temperature Tc, and only the s++ state is left for higher amounts of disorder.

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Держатели документа:
RAS, SB, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Donostia Int Phys Ctr, Donostia San Sebastian 20018, Spain.
RAS, PN Lebedev Phys Inst, Moscow 119991, Russia.

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Dolgov, O. V.; Шестаков, Вадим Андреевич; Russian Foundation for Basic Research [16-02-00098]; Presidium of RAS Program for the Fundamental Studies [12]; "BASIS" Foundation for Development of Theoretical Physics and Mathematics; Gosbudget program [0356-2017-0030]
}
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20.

Dipole glass in chromium-substituted bismuth pyrostannate / S. S. Aplesnin [et al.] // Mater. Res. Express. - 2018. - Vol. 5, Is. 11. - Ст. 115202, DOI 10.1088/2053-1591/aaddd9. - Cited References: 33. - This study was supported by the Russian Foundation for Basic Research project N 18-52-00009 Bel_a, No 18-32-00079 mol_a, the state order No 3.5743.2017/6.7. . - ISSN 2053-1591

РУБ Materials Science, Multidisciplinary
Рубрики:
BI4TI3O12 THIN-FILMS
   NEUTRON-DIFFRACTION
   RAMAN-SPECTROSCOPY
   BI2SN2O7
Кл.слова (ненормированные):
dipole glass -- permittivity -- polarization -- Raman scattering spectra -- structural transition
Аннотация: To establish the existence of dipole glass in the chromium-substituted bismuth pyrostannate solid solutions, the frequency and temperature dependences of the permittivity have been measured in the temperature range of 300–750 K. The field and dynamic dependences of polarization in the temperature range of 80–550 K have been determined. Using the Raman scattering spectra, the absence of inversion center has been established. The maximum of electrical resistance has been found in the vicinity of the dipole moment freezing point. The carrier type has been determined from the thermopower data. The polarization relaxation is shown to be nonexponential. The experimental data are explained within the model of dipole glass in the α- phase and the model of charged crystalline domain walls with the electron-polarization relaxation mechanism above the α–β structural transition.

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Держатели документа:
SB RAS, Kirensky Inst Phys, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Inst Solid State Phys, LV-1063 Riga, Latvia.

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Udod, L. V.; Удод, Любовь Викторовна; Sitnikov, M. N.; Kretinin, V. V.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mironova-Ulmane, N.; Russian Foundation for Basic Research [N 18-52-00009 Bel_a, 18-32-00079 mol_a, 3.5743.2017/6.7]
}
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