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Magnetic and electrical properties of bismuth cobaltite Bi24(CoBi)O40 with charge ordering / S. S. Aplesnin [и др.] // Phys. Solid State. - 2012. - Vol. 54, Is. 10. - P. 2005-2014, DOI 10.1134/S106378341210006X. - Cited References: 22. - This study was supported by the Russian Foundation for Basic Research (project nos. 09-02-92001-NNS_a, 12-02-00125-a, and 11-02-98004-r_sibir'_a) . - ISSN 1063-7834

РУБ Physics + Condensed Matter
Рубрики:
Thermoelectric-power
   Co3O4
   Conductivity
   Transition
Аннотация: The compound Bi24(CoBi)O40 has been synthesized using the solid-phase reaction method. The temperature and field dependences of the magnetic moment in the temperature range 4 K T 300 K and the temperature dependences of the EPR line width and g-factor at temperatures 80 K T 300 K have been investigated. The electrical resistivity and thermoelectric power have been measured in the temperature range 100 K T 1000 K. The activation energy has been determined and the crossover of the thermoelectric power from the phonon mechanism to the electron mechanism with variations in the temperature has been observed. The thermal expansion coefficient of the samples has been measured in the temperature range 300 K T 1000 K and the qualitative agreement with the temperature behavior of the electrical resistivity has been achieved. The electrical and structural properties of the compound have been explained in the framework of the model of the electronic-structure transition with inclusion of the exchange and Coulomb interactions between electrons and the electron-phonon interaction.

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Публикация на русском языке Магнитные и электрические свойства кобальтита висмута Bi24(CoBi)O40 с зарядовым упорядочением [Текст] / С. С. Аплеснин [и др.] // Физ. тверд. тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54 Вып. 10. - С. 1882-1890

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Udod, L. V.; Удод, Любовь Викторовна; Sitnikov, M. N.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Gorev, M. V.; Горев, Михаил Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Galyas, A. I.; Yanushkevich, K. I.
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    Bulgakov, E. N.
    Light-induced degeneracy of resonance modes in a nonlinear microcavity coupled with waveguides: Application to channel drop filter / E. N. Bulgakov, A. F. Sadreev // J. Opt. Soc. Am. B. - 2013. - Vol. 30, Is. 9. - P. 2549-2554, DOI 10.1364/JOSAB.30.002549 . - ISSN 0740-3224
   Перевод заглавия: Свето-индуцированное восстановления вырождения в нелинейном микрорезонаторе, связанного с волноводами: приложение к переключателю каналов
Кл.слова (ненормированные):
Channel drop filters -- Channel dropping -- Eigen modes -- Injected power -- Light-induced -- Parallel waveguides -- Resonance mode -- Two-dimensional photonic crystals -- Microcavities -- Natural frequencies -- Waveguides -- Waveguide filters
Аннотация: We consider a microcavity with degenerate dipole or hexapole eigenmodes. If the cavity is positioned between waveguides, degeneracy is lifted. However, we show that in a nonlinear microcavity the degeneracy is recovered at certain injected power. In application we consider a two-dimensional photonic crystal of GaAs rods holding two parallel waveguides and one defect made of Kerr media. We show that 100% efficiency channel dropping can be attained without a necessity to tune the resonant frequencies of the microcavity. В© 2013 Optical Society of America.

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Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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Korshunov, M. A.
Molecular dynamics investigation of the helical structure of smectic C* / M. A. Korshunov, A. V. Shabanov // Phys. Solid State. - 2012. - Vol. 54, Is. 8. - P. 1704-1708, DOI 10.1134/S106378341208015X. - Cited References: 34 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
LIQUID-CRYSTALS
   SHORT-PITCH
   FORCE-FIELD
   SIMULATIONS
   MODES
   PHASE
   DOBAMBC
   POWER
Аннотация: The numerical simulation of the behavior of the molecules of the DOBAMBC liquid crystal by the molecular dynamics method allowed us to find the change of the the conformation of molecules as a function of temperature and to reveal the helical structures with various pitches in the smectic phase C*. These results explained the anomalous temperature dependences of the order parameter at the molecular level, as well as the optical second harmonic generation in the region of smectic A.

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Публикация на русском языке Коршунов, Михаил Анатольевич. Исследование геликоидальной структуры смектика C* методом молекулярной динамики [Текст] / М. А. Коршунов, А. В. Шабанов // Физ. тверд. тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54 Вып. 8. - С. 1596-1599

Держатели документа:
[Korshunov, M. A.
Shabanov, A. V.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50-38, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Shabanov, A. V.; Шабанов, Александр Васильевич; Коршунов, Михаил Анатольевич
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Efficient selective excitation in optically thick extensive media by adiabatic population transfer / V. G. Arkhipkin [et al.] ; ed.: K Mima, GL Kulcinski, ki, GL Kulci // High-power lasers in energy engineering. Ser. Proceedings of the society of photo-optical instrumentation engineers (SPIE) : SPIE-Int. Soc. Optical Engineering, 2000. - Vol. 3886. - P. 699-703, DOI 10.1117/12.375171. - Cited References: 13 . - ISBN 0277-786X. - ISBN 0-8194-3484-1

РУБ Optics + Physics, Applied + Physics, Fluids & Plasmas
Рубрики:
ELECTROMAGNETICALLY INDUCED TRANSPARENCY
MULTILEVEL SYSTEMS
LASER-PULSES
Кл.слова (ненормированные):
adiabatic population transfer -- electromagnetically induced transparency -- counterintuitive pulse sequence
Аннотация: In this work the feature of spatio-temporal evolution of two partially overlapped short pulses of counterintuitive sequence in a medium of three-level absorbing atoms in conditions of adiabatic transfer of population are investigated. The analytic solution is constructed. It is shown, that selective excitation of two-photon resonant state with a near-unity probability is conserved on the length of medium, which is considerably greater than the absorbtion length of a weak probe pulse in the absence of a coupling pulse at the adjacent transition.

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Доп.точки доступа:
Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Manushkin, D. V.; Timofeev, V. P.; Timofeev, I. V.; Тимофеев, Иван Владимирович; Conference on High-Power Lasers in Energy Engineering (1999, Nov. ; Osaka, Japan)
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    Переход металл-диэлектрик в катион-замещенных соединениях ReхMn1-xS (Re = Gd, Sm, Ho) / О. Б. Романова [и др.] // Вестник СибГАУ. - 2015. - Т. 16, № 2. - С. 478-484. - Библиогр.: 38. - Работа выполнена при финансовой поддержке РФФИ № 15-42-04099 р_Cибирь_а и государственного задания № 114090470016. . - ISSN 1816-9724
   Перевод заглавия: Metal-insulator transition in the cation-substituted compounds RexMn1-xS (Re = Gd, Sm, Ho)
Кл.слова (ненормированные):
СУЛЬФИДЫ РЕДКОЗЕМЕЛЬНЫХ ЭЛЕМЕНТОВ -- ПРОВОДИМОСТЬ -- ПЕРЕХОД МЕТАЛЛ-ДИЭЛЕКТРИК -- ТЕРМОЭДС -- SULFIDES OF RARE-EARTH ELEMENTS -- CONDUCTIVITY -- TRANSITION METAL-INSULATOR -- THERMOELECTRIC POWER
Аннотация: Представлены результаты исследования транспортных свойств катион-замещенных сульфидов RexMn1-xS (Re = Gd, Sm, Ho) с ГЦК-решеткой типа NaCl в области температур 77-1200 К. С увеличением степени катионного замещения в этих соединениях RexMn1-xS (Re = Gd, Sm, Ho) изменяется тип проводимости от полупроводникового до металлического при критической концентрации Х С. Концентрационный переход металл-диэлектрик в системе Gd XMn 1-XS сопровождается уменьшением величины удельного электросопротивления на 12 порядков и коэффициента термоЭДС (α) на два порядка. Катионное замещение в твердых растворах GdxMn1-xS приводит к смене дырочного типа проводимости (α > 0), свойственного моносульфиду марганца, на электронный (α < 0). Уменьшение величины α с увеличением содержания гадолиния в решетке MnS указывает на то, что Gd действует как донорная примесь. Для Sm 0,2Mn 0,8S обнаружен резкий максимум сопротивления при Т = 100 К, который может быть вызван рассеянием электронов проводимости на спиновых флуктуациях локализованных электронов. Установлен металлический тип проводимости для Sm 0,25Mn 0,75S и механизм электрического сопротивления, который связан с рассеянием электронов на акустических фононах и с магнитным рассеянием на нескомпенсированных антиферромагнитных кластерах марганца при Т < 180 К. В результате замещения марганца самарием в твердом растворе SmxMn1-xS электронная структура перестраивается, и сопротивление невозможно объяснить на основе протекания ионов самария. Общей закономерностью температурных зависимостей коэффициента термоЭДС как для системы с гадолинием, так и для системы с самарием является проявление отрицательного значения термоЭДС во всем диапазоне температур с ростом Х. В системе HoxMn1-xS переход металл-диэлектрик обнаружен для ХС = 0,3 с уменьшением величины удельного электросопротивления на десять порядков. Цель данной работы - установить условия реализации перехода металл-диэлектрик в катион-замещенных системах RexMn1-xS (Re = Gd, Sm, Ho).
This paper presents the results of a study of the transport properties of cation-substituted sulfides Re XMn 1-XS (Re = = Gd, Sm, Ho) with FCC NaCl type in the temperature range 77-1200 K. With increasing degree of cation substitution in these compounds Re XMn 1- ХS (Re = Gd, Sm, Ho) the conductivity type changes from the semiconductor to the «metal» at the critical concentration X C. The concentration of metal-insulator transition in the system Gd XMn 1-XS is accompanied by a decreasing in the electrical resistivity of value on 12 orders and Seebeck coefficient (α) is on two orders. The cation-substitution in the solid solutions Gd XMn 1-XS leads to p-type conductivity (α > 0), as comprising to electronic (α < 0) for manganese monosulfide. Decrease of α with increasing gadolinium concentration in the MnS lattice indicates that the Gd acts as a donor impurity. For Sm 0,2Mn0,8S a maximum resistance at T = 100 K attributed to the scattering of conduction electrons by spin fluctuations of localized electrons. The metallic conductivity for Sm 0.25Mn 0.75S and the mechanism of electrical resistance, which is related to the scattering of electrons by acoustic phonons and magnetic scattering by uncompensated antiferromagnetic manganese clusters at T < 180 K were revealed. As a result of the substitution of manganese to samarium in solid solution Sm XMn 1-XS the electron structure is reconstructed, and the resistance cannot be explained on the basis of the percolation of samarium ions. The temperature dependence of Seebeck coefficient for systems with gadolinium and with samarium reveals the negative values of thermoelectric power in the all range of temperatures with increasing concentration (X). The metal-insulator transition for system Ho XMn 1-XS at Х С= 0,3 is observed with decreasing resistivity on ten orders. The purpose of this work is to establish conditions for the realization of the metal-insulator transition in a cation-substituted systems Re XMn 1-XS (Re = Gd, Sm, Ho).

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Держатели документа:
Институт физики им. Л. В. Киренского СО РАН
Сибирский государственный аэрокосмический университет имени акад. М. Ф. Решетнева

Доп.точки доступа:
Романова, Оксана Борисовна; Romanova, O. B.; Харьков, Анатолий Михайлович; Kharkov A. M.; Ситников, Максим Николаевич; Sitnicov M. N.; Кретинин, В. В.; Kretinin, V. V.
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Magnetoresistance anisotropy and scaling in textured high-temperature superconductor Bi1.8Pb0.3Sr1.9Ca2Cu3Ox / D. M. Gokhfel’d [et al.] // Phys. Solid State. - 2015. - Vol. 57, Is. 11. - P. 2145-2150, DOI 10.1134/S1063783415110128. - Cited References: 29 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ELECTRIC-POWER APPLICATIONS
   TRANSPORT CRITICAL-CURRENT
   T-C
   SINGLE-CRYSTALS
   TAPES
   DISSIPATION
   BOUNDARIES
   DENSITY
   FIELD
Аннотация: The magnetoresistance of the textured high-temperature superconductor (HTSC) Bi1.8Pb0.3Sr1.9Ca2Cu3Ox + Ag has been studied at different directions of the transport current I and external magnetic field H with respect to crystallographic directions of HTSC crystallites. When I and H are oriented along the ab planes of crystallites and φ is the angle between H and I, the anisotropic part of the magnetoresistance follows the functional dependence sin2φ, which is characteristic of vortex flows under Lorentz forces. The magnetoresistance R at H parallel to the c axis of crystallites (H || c) is higher than R at H || ab for both cases of I || c and I || ab. The anisotropy coefficient γ ≈ 2.3 has been estimated from the scaling of the dependences R(H) measured at H || c and H || ab. The inclusion of the magnetic field induced by the transport current allows scaling of the dependences R(H) at different values of I. A qualitative picture of the current flow along the c axis of crystallites in the textured HTSC has been proposed. © 2015, Pleiades Publishing, Ltd.

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Публикация на русском языке Анизотропия и скейлинг магнитосопротивления в текстурированном высокотемпературном сверхпроводнике Bi1.8Pb0.3Sr1.9Ca2Cu3Ox [Текст] / Д. М. Гохфельд [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2015. - Т. 57 Вып. 11. - С. 2090-2094

Держатели документа:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50–38, Krasnoyarsk, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Gokhfel'd, D. M.; Гохфельд, Денис Михайлович; Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Petrov, M. I.; Петров, Михаил Иванович
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    Исследование функционирования микрополоскового устройства защиты с ВТСП элементом в режимах повышенной мощности и кратковременных импульсов / И. В. Говорун [и др.] // Изв. вузов. Физика. - 2015. - Т. 58, № 8/2. - С. 126-128. - Библиогр.: 2. - Работа выполнена при поддержке Министерства образования и науки РФ, соглашение №14-607-21-0039 . - ISSN 0021-3411
   Перевод заглавия: Investigation of operation of microstrip HTSC based power limiter in high power and short pulses modes
Кл.слова (ненормированные):
микрополосковый резонатор -- ВТСП -- устройство защиты -- взаимодействие резонаторов -- microstrip resonator -- HTS -- protection device -- interaction of resonators
Аннотация: Разработано и изготовлено устройство защиты на основе микрополосковых резонаторов форме гантели с переключающим элементом, выполненным из ВТСП тонкой пленки. Исследованы передаточные характеристики устройства при работе с сигналами до 40 Вт мощности, а также влияние на полосу пропускания длительности одиночного импульса сигнала разной мощности. Проведена экспериментальная оценка времени переключения в закрытый режим.
A microstrip power limiter based on dumbbell-shaped resonators having a switcher made from high-temperature superconducting film was designed and fabricated. The transmission characteristics of the device were investigated in the case of microwave power level up to 40 W. An influence of single pulse duration of various magnitudes upon the passband of the device was investigated. An experimental estimation of the switch time to the closed mode was done.

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Говорун, Илья Валерьевич; Govorun, I. V.; Лексиков, Александр Александрович; Leksikov, Al. A.; Лексиков, Андрей Александрович; Leksikov, An. A.; Сержантов, Алексей Михайлович; Serzhantov, A. M.
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Reflective power limiter for X-band with HTSC switching element / B. A. Belyaev [et al.] // IEEE Trans. Appl. Supercond. - 2016. - Vol. 26, Is. 6. - Ст. 1500506, DOI 10.1109/TASC.2016.2530700. - Cited References:23 . - ISSN 1051-8223. - ISSN 1558-2515

РУБ Engineering, Electrical & Electronic + Physics, Applied
Рубрики:
Superconducting transmission-line
Кл.слова (ненормированные):
Microstrip structure -- microwave (MW) -- power limiter (PL) -- transmission -- zero
Аннотация: This paper presents a new type of power limiter (PL), using superconducting-to-normal state phase transition in high-temperature superconductor. The presented device differs from the existing ones mainly in the reflective principle of its operation. In fact, the PL is a three-resonator microstrip filter, whose resonators are configured and arranged in such a manner that coupling coefficient between the outer resonators is equal to zero and the inner one has a gap in the middle section shunted by a high-temperature superconducting (HTS) film element. In small-signal mode, the HTS element is in low-loss state, and the device is essentially a three-pole filter with low transmission loss. When the level of the signal exceeds the threshold, the HTS element transits to the high-loss state, and the Q-factor of the inner resonator falls, breaking the coupling in the structure. This leads to the corresponding increase in the PL's transmission loss due to reflection. The higher the level of incoming power, the more the Q-factor falls. The PL operating frequency is 8 GHz with 8.5% fractional bandwidth. It remains operable up to 40 W of input power, providing 38-dB limitation.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660074, Russia.

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Govorun, I. V.; Говорун, Илья Валерьевич; Leksikov, Al. A.; Лексиков, Александр Александрович; Serzhantov, A. M.; Сержантов, Алексей Михайлович; Leksikov, An. A.; Лексиков, Андрей Александрович
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Bulgakov, E. N.
Switching through symmetry breaking for transmission in a T-shaped photonic waveguide coupled with two identical nonlinear micro-cavities / E. . Bulgakov, A. . Sadreev // J. Phys.: Condens. Matter. - 2011. - Vol. 23, Is. 31. - Ст. 315303, DOI 10.1088/0953-8984/23/31/315303. - Cited References: 32 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
MODE THEORY
   NUCLEAR REACTIONS
   UNIFIED THEORY
   FIBER
   INSTABILITIES
   RESONANCE
   GRATINGS
   SYSTEM
   STATES
Кл.слова (ненормированные):
All-optical switching -- Anti-symmetric -- Central waveguides -- Coupled mode theory -- Input power -- Input pulse -- Mirror symmetry -- Nonlinear cavities -- Output waveguides -- Photonic waveguides -- Standing wave -- Symmetry-breaking -- Microcavities -- Mirrors -- Waveguides -- Light transmission
Аннотация: Using coupled mode theory we consider transmission in a T-shaped waveguide coupled with two identical symmetrically positioned nonlinear micro-cavities with mirror symmetry. For input power injected into the central waveguide we show the existence of a symmetry breaking solution which is a result of mixing of the symmetrical input wave with an antisymmetric standing wave in the Fabry-Perot interferometer. With growth of the input power, a feature in the form of loops arises in the solution which originates from bistability in the transmission in the output left/right waveguide coupled with the first/second nonlinear cavity. The domains of stability of the solution are found. The breaking of mirror symmetry gives rise to nonsymmetrical left and right outputs. We demonstrate that this phenomenon can be explored for all-optical switching of light transmission from the left output waveguide to the right one by application of input pulses.

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Держатели документа:
[Bulgakov, Evgeny
Sadreev, Almas] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Bulgakov, Evgeny] Siberian State Aerosp Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk Rabochii, Krasnoyarsk 31, Russian Federation

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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10.

The magnetic-field-driven effect of microwave detection in a manganite granular system / N. V. Volkov [et al.] // J. Phys. D. - 2008. - Vol. 41, Is. 1. - Ст. 15004, DOI 10.1088/0022-3727/41/1/015004. - Cited References: 24 . - ISSN 0022-3727

РУБ Physics, Applied
Рубрики:
IDENTICAL METALS
   TUNNEL-JUNCTIONS
   MAGNETORESISTANCE
   RECTIFICATION
   SPINTRONICS
   TEMPERATURE
   PEROVSKITES
Кл.слова (ненормированные):
Bias currents -- Curie temperature -- Electric power generation -- Granular materials -- Magnetic field effects -- Microwave irradiation -- Voltage measurement -- Direct current voltage -- Magnetic tunnel junctions -- Metal insulator metal junctions -- Nonmagnetic metals -- Manganites
Аннотация: We demonstrate the microwave detection effect in a granular La0.7Ca0.3MnO3 sample. Dc voltage generated by the sample in response to microwave irradiation below the Curie temperature is found to be dependent on the applied magnetic field. The magnetic field dependence of the dc voltage has a broad peak resembling an absorption line. The detection effect depends substantially on the magnetic history of the sample; however, identical measurement conditions provide reproducibility of the experimental results. The detected dc voltage increases linearly with microwave power and strongly depends on a bias current through the sample. According to the results of systematic measurements, there exist two contributions to a value of the detected output signal. The first is magneto-independent; it can be explained in the framework of a mechanism used traditionally for description of the rectification effect in metal-insulator-metal junctions with nonmagnetic metals. The other is magneto-dependent; it originates from the interplay between the spin-dependent current through magnetic tunnel junctions and spin dynamics of the grains, which form these junctions in the sample.

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Держатели документа:
[Volkov, N. V.
Eremin, E. V.
Shaykhutdinov, K. A.
Tsikalov, V. S.
Petrov, M. I.
Balaev, D. A.
Semenov, S. V.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Volkov, N. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Tsikalov, V. S.; Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семенов, Сергей Васильевич
}
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11.

Berggren, K. F.
Crossover from regular to irregular behavior in current flow through open billiards / K. F. Berggren, A. F. Sadreev, A. A. Starikov // Phys. Rev. E. - 2002. - Vol. 66, Is. 1. - Ст. 16218, DOI 10.1103/PhysRevE.66.016218. - Cited References: 36 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
PHASE SINGULARITIES
   NODAL POINTS
   WAVE-FIELDS
   QUANTUM
   STREAMLINES
   CONDUCTANCE
   VORTICES
   CHAOS
Кл.слова (ненормированные):
Eigenvalues and eigenfunctions -- Mathematical models -- Networks (circuits) -- Random processes -- Resonance -- Signal processing -- Spurious signal noise -- Bursting time series -- Coherence resonance -- Power spectrum -- Stochastic resonance -- Chaos theory
Аннотация: We discuss signatures of quantum chaos in terms of distributions of nodal points, saddle points, and streamlines for coherent electron transport through two-dimensional billiards, which are either nominally integrable or chaotic. As typical examples of the two cases we select rectangular and Sinai billiards. We have numerically evaluted distribution functions for nearest distances between nodal points and found that there is a generic form for open chaotic billiards through which a net current is passed. We have also evaluated the distribution functions for nodal points with specific vorticity (winding number) as well as for saddle points. The distributions may be used as signatures of quantum chaos in open systems. All distributions are well reproduced using random complex linear combinations of nearly monochromatic states in nominally closed billiards. In the case of rectangular billiards with simple sharp-cornered leads the distributions have characteristic features related to order among the nodal points. A flaring or rounding of the contact regions may, however, induce a crossover to nodal point distributions and current flow typical for quantum chaos. For an irregular arrangement of nodal points, as for example in the Sinai billiard, the quantum flow lines become very complex and volatile, recalling chaos among classical trajectories. Similarities with percolation are pointed out.

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Держатели документа:
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Dept. of Phys. and Msrmt. Technology, Linkoping University, S-581 83 Linkoping, Sweden
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Starikov, A. A.
}
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12.

Zobov, V. E.
On the coordinate of a singular point of the time correlation function for a spin system on a simple hypercubic lattice at high temperatures / V. E. Zobov, M. A. Popov // Theor. Math. Phys. - 2002. - Vol. 131, Is. 3. - P. 862-872, DOI 10.1023/A:1015935809388. - Cited References: 19 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
NUCLEAR-DOUBLE-RESONANCE
   HEISENBERG MAGNET
   DEPENDENCE
   MODEL
Кл.слова (ненормированные):
spin dynamics -- correlation functions -- power series in time -- frequency moments -- singular points -- generated functions -- lattice trees -- multidimensional expansion -- Correlation functions -- Frequency moments -- Generated functions -- Lattice trees -- Multidimensional expansion -- Power series in time -- Singular points -- Spin dynamics
Аннотация: Using the d(-1) expansion method (d is the space dimension), we estimate the coordinate of the time-dependent autocorrelation function singular point on the imaginary time axis for the spin 1/2 Heisenberg model on a simple hypercubic lattice at high temperatures. We represent the coefficients of the time expansion (the spectral moments) for the autocorrelation function as the sums of the weighted lattice figures in which the trees constructed from the double bonds give the leading contributions with respect to d(-1) and the same trees with the built-in squares from six bonds or diagrams with the fourfold bonds give the contribution of the next-to-leading order. We find the corrections to the coordinate of the autocorrelation function singular point that are due to the latter contributions.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, Russian Federation
Kirensky State University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
}
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13.

Zobov, V. E.
Second moment of multiple-quantum NMR and a time-dependent growth of the number of multispin correlations in solids / V. E. Zobov, A. A. Lundin // J. Exp. Theor. Phys. - 2006. - Vol. 103, Is. 6. - P. 904-916, DOI 10.1134/S1063776106120089. - Cited References: 39 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
NUCLEAR-MAGNETIC-RESONANCE
   LINE-SHAPE
   SPIN SYSTEMS
   DYNAMICS
   SPECTRA
   COHERENCES
   STATE
   BEHAVIOR
   CRYSTAL
   MODEL
Кл.слова (ненормированные):
Correlation methods -- Mathematical models -- Nuclear magnetic resonance spectroscopy -- Spectrum analysis -- Time series analysis -- Four-spin time correlation -- Multispin correlations -- Second moment -- Time power series -- Quantum theory
Аннотация: The time evolution of multispin correlations (the growth of the number of correlated spins as a function of time) can be observed directly using the multiple-quantum nuclear magnetic resonance spectroscopy of solids. A quantity related to this number, namely, the second moment of the intensity distribution of coherences of different orders in the multiple-quantum spectrum can be calculated using the theory proposed in this work. An approach to the calculation of the four-spin time correlation function through which this moment is expressed is developed. The main sequences of contributions in the expansion of this function into a time power series are summed using the approximation of a large number of neighbors both for systems with a secular dipole-dipole interaction and for systems with a nonsecular effective interaction. An exponential dependence of is obtained. The value of is additionally calculated using an expansion in terms of orthogonal operators for three model examples corresponding to different limiting realizations of spin systems. It is shown that the results of the microscopic theory at least qualitatively agree with both the results obtained for model examples and experimental results obtained recently for adamantane.

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Russian Acad Sci, Semenov Inst Chem Phys, Moscow 117977, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 117977, Russian Federation

Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич
}
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14.

SHAPIRO, V. E.
NEW METHOD AND EXACT-SOLUTIONS FOR WAVES IN RANDOM-MEDIA / V. E. SHAPIRO // Phys. Lett. A. - 1992. - Vol. 162, Is. 4. - P. 309-312, DOI 10.1016/0375-9601(92)90022-E. - Cited References: 14 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
RADIATIVE TRANSPORT-THEORY
   POWER STATISTICS
   ONE-DIMENSION
   PROPAGATION
Аннотация: A method based on the kinetic equations for Markov processes is found which is effective within as well as beyond the scope of conventional restrictions - one-dimensional stochastic equations with given initial conditions. For the first time the problem of finding averages for linear systems with nonadditive random influence, typical models of the theory of wave propagation in random media, is solved to obtain exact solutions.

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Держатели документа:
L.V. Kirenski Institute of Physics, Krasnoyarsk, 660036, Russian Federation
ИФ СО РАН
}
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15.

Optically driven conductivity and magnetoresistance in a manganite-based tunnel structure / N. V. Volkov [et al.] // J. Phys. D. - 2009. - Vol. 42, Is. 20. - Ст. 205009, DOI 10.1088/0022-3727/42/20/205009. - Cited References: 13. - This study was supported by the Russian Foundation for Basic Research (Projects Nos 08-02-00259-a and 08-02-00397-a) and the Division of Physical Sciences of the RAS, Programme 'Spin-dependent Effects in Solids and Spintronics' (Project No 2.4.2 of the Siberian Branch of the RAS). . - ISSN 0022-3727

РУБ Physics, Applied
Рубрики:
JUNCTIONS
Кл.слова (ненормированные):
Conducting layers -- Current-in-plane geometry -- Dielectric layer -- Electron hole pairs -- Interband absorption -- Magnetic tunnel junction -- Magnetic tunnels -- Multilayer structures -- Optical radiations -- Photoinduced change -- Potential barriers -- Radiation power density -- Threshold characters -- Tunnel structures -- Electric resistance -- Lanthanum -- Light -- Magnetic field effects -- Magnetoelectronics -- Magnetoresistance -- Manganese compounds -- Oxide minerals -- Photovoltaic effects -- Semiconductor junctions -- Transport properties -- Vehicular tunnels -- Wind tunnels -- Tunnel junctions
Аннотация: In the multilayer structure, La(0.7)Sr(0.3)MnO(3)/depleted manganite layer/MnSi, the photovoltaic effect has been discovered. The depleted manganite layer in the structure is dielectric and serves as a potential barrier between the ferromagnetic conducting La(0.7)Sr(0.3)MnO(3) and MnSi layers by the formation of a magnetic tunnel junction. The photoinduced changes in the transport properties of the magnetic tunnel structure have been observed in the current-in-plane geometry. The changes are reversible and saturate at radiation power densities over 30 mW cm(-2). The photovoltaic effect has a threshold character: it reveals only at h nu > 1.17 eV. Most likely, the effect of optical radiation is related to the formation of electron-hole pairs due to interband absorption of light in the dielectric layer. A photocurrent through the tunnel junctions separating the conducting layers causes a redistribution of the current channels between the conducting layers, which influences the conductivity and the magnetoresistance of the structure.

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Держатели документа:
[Volkov, N. V.
Kim, P. D.
Eremin, E. V.
Patrin, G. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Volkov, N. V.
Patrin, G. S.] Siberian Fed Univ, Inst Engn Phys, Krasnoyarsk 660041, Russia
[Lee, C. G.] Changwon Natl Univ, Sch Nano & Adv Mat Engn, Chang Won 641773, Gyeongnam, South Korea
[Eremin, E. V.] Siberian State Aerosp Univ, Inst Space Technol, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Russian Academy of Science, Siberian Branch, Krasnoyarsk 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Changwon National University, School of Nano and Advanced Materials Engineering, Gyeongnam 641-773, Changwon, South Korea
Institute of Space Technology, Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Lee, C. G.; Kim, P. D.; Ким, Пётр Дементьевич; Eremin, E. V.; Еремин, Евгений Владимирович; Patrin, G. S.; Патрин, Геннадий Семёнович; Russian Foundation for Basic Research [08-02-00259-a, 08-02-00397-a]; Division of Physical Sciences of the RAS; [2.4.2]
}
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16.

KRASNOV, I. V.
STRAIGHTENING EFFECT OF RADIATION POWER AND LIGHT-INDUCED PHENOMENA OF TRANSFER IN RESONANCE GASES / I. V. KRASNOV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1995. - Vol. 107, Is. 4. - P. 1135-1152. - Cited References: 18 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
FORCE
ATOMS

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}
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17.

KARYAGIN, V. V.
DRAG THERMOELECTRIC-POWER OF A TWO-DIMENSIONAL ELECTRON-GAS IN A GAAS-GAAIAS HETEROSTRUCTURE / V. V. KARYAGIN, I. I. LYAPILIN, V. V. DYAKIN // SOVIET PHYSICS SEMICONDUCTORS-USSR. - 1988. - Vol. 22, Is. 8. - P. 954-955. - Cited References: 3 . - ISSN 0038-5700

РУБ Physics, Condensed Matter

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Доп.точки доступа:
LYAPILIN, I. I.; DYAKIN, V. V.
}
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18.

Losses of magnetite iron in wet separation / E. K. Yakubailik [et al.] // Steel Transl. - 2016. - Vol. 46, Is. 6. - P. 390-394, DOI 10.3103/S0967091216060115. - Cited References: 15 . - ISSN 0967-0912
Кл.слова (ненормированные):
high-power magnets -- iron losses -- magnetic parameters -- magnetite iron -- tailings -- wet separation
Аннотация: Samples of all the tailings from enrichment processes at the Abagur plant operated by OAO Evrazruda are studied. The tailings are subjected to magnetic and chemical analysis, and the magnetic characteristics of the products are measured. The mean magnetite iron content in the tailings was about 0.9% in 2013. Experiments confirm that the main magnetite losses are associated with small classes and their poor magnetic properties. The losses of magnetite are reduced as the separation field is increased. At the plant, 45% of the barium–ferrite magnetic systems in the PBM 90/250 separators have been replaced by a system based on neodymium–iron–boron composites, with increase in the field from 111 to 175 kA/m. Modernization of the magnetic systems in all the separators at the Abagur plant is recommended. In thickening, the installation of separators for regeneration of the suspensions, with a field of 190 kA/m, is recommended. After reconstruction, the losses of magnetite iron at the plant may be reduced to 0.45–0.55%. © 2016, Allerton Press, Inc.

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Публикация на русском языке Уровень потерь магнетитового железа при мокрой сепарации [Текст] / Э. К. Якубайлик [и др.] // Изв. вузов. Черн. металлургия. - Москва : Национальный исследовательский технологический университет «МИСиС», 2016. - Т. 59 № 6. - С. 397-401

Держатели документа:
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
OAO Evrazruda, Novokuznetsk, Russian Federation
ZAO GMK Kazakhaltyn, Stepnogorsk, Kazakhstan

Доп.точки доступа:
Yakubailik, E. K.; Якубайлик, Эдуард Константинович; Ganzhenko, I. M.; Butov, P. Y.; Kilin, V. I.
}
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19.

Upconversion luminescence of CsScF4 crystals doped with erbium and ytterbium / D. A. Ikonnikov [et al.] // Opt. Mater. - 2016. - Vol. 60. - P. 584-589, DOI 10.1016/j.optmat.2016.09.016. - Cited References:33. - The authors are grateful to D. L. Chertkova for excellent technical assistance. The work was partially supported by the Russian Foundation for Basic Research Grant 15-52-53080, by the Russian President Grant SS-7612.2016.2, and by Project No0358-2015-0012 of SB RAS Program NoII.2P. . - ISSN 0925-3467. - ISSN 1873-1252

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
MODULATED STRUCTURE
   LANTHANIDE
   NANOCRYSTALS
   PHOSPHORS
Кл.слова (ненормированные):
Fluoride crystals -- Erbium -- Ytterbium -- Up-conversion -- Luminescence -- Crystal structure -- Power dependence -- Pump wavelength dependence
Аннотация: Tetragonal CsScF4 crystals doped with (5 at.%) Er and Er/Yb (0.5 at.%/5 at.%) are grown and their crystal structure is determined to belong to Pmmn space group. Er and Yb ions are shown to occupy distorted octahedral Sc sites with the center of inversion. Bright visible upconversion luminescence was observed under 970-980 nm pumping with red (4F9/2), yellow (4S3/2) and green (2H11/2) bands of comparable intensity. UCL tuning curves maximize at 972 nm (CSF:Er) and at 969.7 nm (CSF:Er,Yb) pumping wavelengths. Different ratios between yellow-green and red luminescence intensities in CSF:Er and CSF:Er, Yb are explained by contribution of cross-relaxation in CSF:Er UCL UC in CSF:Er is a three stage process while UC in CSF:Er, Yb is a two stage process. The peculiarities of power dependences are explained by the power-dependent repopulation between starting levels of UC. (C) 2016 Elsevier B.V. All rights reserved.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk, Russia.
LV Kirenskii Inst Phys, Krasnoyarsk, Russia.
Far Eastern State Transport Univ, Khabarovsk, Russia.

Доп.точки доступа:
Ikonnikov, D. A.; Voronov, V. N.; Воронов, Владимир Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Russian Foundation for Basic Research [15-52-53080]; Russian President [SS-7612.2016.2, 0358-2015-0012, II.2P]
}
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20.

Photo-manipulated photonic bandgap devices based on optically tristable chiral-tilted homeotropic nematic liquid crystal / K. -C. Huang [et al.] // Opt. Express. - 2016. - Vol. 24, Is. 22. - P. 25019-25025, DOI 10.1364/OE.24.025019. - Cited References: 22. - Ministry of Science and Technology (MOST), (103-2923-M-009-003-MY3); Ministry of Education and Science of the Russian Federation (3.1276.2014/K); Siberian Branch of the Russian Academy of Sciences under Complex Program II.2P (0358-2015-0010, 0358-2015-0011). . - ISSN 1094-4087
Кл.слова (ненормированные):
Defects -- Energy gap -- Liquid crystals -- Nematic liquid crystals -- Photonic crystals -- Spontaneous emission -- Homeotropic nematic liquid crystals -- Intensity modulators -- Low-power consumption -- Multi-channel filter -- One dimensional photonic crystal -- Photonic application -- Photonic bandgap devices -- Transmission characteristics -- Light transmission
Аннотация: We report on the spectral properties of an optically switchable tristable chiral-tilted homeotropic nematic liquid crystal (LC) incorporated as a tunable defect layer in one-dimensional photonic crystal. By varying the polarization angle of the incident light and modulating the light intensity ratio between UV and green light, various transmission characteristics of the composite were obtained. The hybrid structure realizes photo-tunability in transmission of defect-mode peaks within the photonic bandgap in addition to optical switchability among three distinct sets of defect modes via photoinduced tristable state transitions. Because the fabrication process is easier and less critical in terms of cell parameters or sample preparation conditions and the LC layer itself possesses an extra stable state compared with the previously reported bistable counterpart operating on the basis of biased-voltage dual-frequency switching, it has much superior potential for photonic applications such as a low-power-consumption multichannel filter and an optically controllable intensity modulator. © 2016 Optical Society of America.

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Держатели документа:
College of Photonics, National Chiao Tung University, Guiren Dist., Tainan, Taiwan
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Laboratory for Nonlinear Optics and Spectroscopy, Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Huang, K.-C.; Hsiao, Yu-Cheng; Yu-Cheng Hsiao; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Lee, W.
}
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