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Light-induced ultrafast dynamics of spin crossovers under high pressure / Y. S. Orlov, S. V. Nikolaev, A. I. Nesterov, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2021. - Vol. 132, Is. 3. - P. 399-415, DOI 10.1134/S1063776121030079. - Cited References: 71. - The authors thank the Russian Scientific Foundation for the financial support under the grant 18-12-00022 . - ISSN 1063-7761
Кл.слова (ненормированные):
Crossover pressure -- High-spin ground state -- Magnetic insulator -- Metal-oxygen bonds -- Nonlinear oscillation -- Occupation numbers -- Temperature values -- Ultra-fast dynamics -- Spin fluctuations
Аннотация: Within the multielectron model of magnetic insulator with two different spin terms at each cation and spin crossover under high pressure we have studied dynamics of a sudden excited non equilibrium spin state. We obtain the different relaxation of the magnetization, high spin/low spin occupation numbers, and the metal-oxygen bond length for different values of the external pressure. For each pressure-temperature values stationary state agrees to the mean field phase diagrams. We found the long living oscillations of magnetization for the high spin ground state at small pressure. Close to crossover pressure the smooth relaxation is accompanied with a set of sharp strongly non linear oscillations of magnetization and HS/LS occupation numbers that are accompanied by the Franck–Condon resonances.

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Публикация на русском языке Светоиндуцированная сверхбыстрая динамика систем со спиновым кроссовером при высоком давлении [Текст] / Ю. С. Орлов, С. В. Николаев, А. И. Нестеров, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 2021. - Т. 159 Вып. 3. - С. 479-499

Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
CUCEI, Universidad de Guadalajara, Guadalajara, Jalisco CP 44420, Mexico

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Nesterov, A. I.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Dynamical phase shift in x-ray absorption and ionization spectra by two delayed x-ray laser fields / V. Savchenko, F. Gel'mukhanov, T. Laarmann [et al.] // Phys. Rev. A. - 2021. - Vol. 104, Is. 1. - Ст. 013114, DOI 10.1103/PhysRevA.104.013114. - Cited References: 22. - The reported study was funded by Russian Foundation for Basic Research (RFBR), Project No. 19-29-12015. F.G. acknowledges also the support from the Helmholtz Virtual Institute VI419 Dynamic Pathways in Multidimensional Landscapes. T.L. acknowledges support by the Deutsche Forschungsgemeinschaft through the Cluster of Excellence “Advanced Imaging of Matter” (EXC 2056 - Project No. 390715994). V.K. acknowledges support from the Vetenskapsrådet (Grant No. 2019-03470) . - ISSN 2469-9926
Кл.слова (ненормированные):
Excited states -- Ionization -- X ray lasers -- Coherent X-rays -- Core-excited state -- Dynamical phase shift -- Ionization spectrum -- Phase oscillation -- Pulse envelopes -- Relative phase -- X-ray laser field -- X ray absorption
Аннотация: We study theoretically x-ray absorption and ionization spectra of an atom or molecule by two coherent x-ray pulses that show a relative phase shift resulting in a time delay of the pulse envelopes. We demonstrate that the phase modulation of the spectra is shifted with respect to the phase oscillation comb of the x-ray double pulse. The reason for this shift is the dynamics of the process defined by the interplay of the delay time, the pulse width, the detuning, and the lifetime of the core-excited state.

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Держатели документа:
International Research Center of Spectroscopy and Quantum Chemistry-, IRC SQC, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, Stockholm, 10691, Sweden
Institute for Methods and Instrumentation in Synchrotron Radiation Research, FG-ISRR, Helmholtz-Zentrum Berlin fu, r Materialien und Energie, Albert-Einstein-Strasse 15, Berlin, 12489, Germany
Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, Hamburg, 22607, Germany
Hamburg Centre for Ultrafast Imaging CUI, Luruper Chaussee 149, Hamburg, 22761, Germany
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Savchenko, V.; Gel'mukhanov, F.; Laarmann, T.; Polyutov, S. P.; Полютов, Сергей Петрович; Kimberg, V.; Кимберг, Виктор Валерьевич
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A three-mode microstrip resonator and a miniature ultra-wideband filter based on it / B. A. Belyaev [et al.] // Dokl. Phys. - 2017. - Vol. 62, Is. 6. - P. 289-293, DOI 10.1134/S102833581706009X. - Cited References: 14 . - ISSN 1028-3358
Кл.слова (ненормированные):
Bandpass filters -- Microwave filters -- Resonators -- Filter structures -- High selectivity -- Microstrip resonator -- Oscillation mode -- Parametric synthesis -- Passband frequencies -- Ultra-wideband filters -- Wide band filter -- Microstrip filters
Аннотация: An original microstrip resonator design with a strip conductor split by a slot at one of its ends is investigated. It is demonstrated that at the optimal slot sizes, when the eigenfrequency of the second oscillation mode hits the center between the first and third oscillation modes, the resonator can work as a thirdorder bandpass filter. The structure formed from only two such resonators electromagnetically coupled by split conductor sections is a miniature six-order wideband filter with high selectivity. The test prototype of the filter with a central passband frequency of ~1.2 GHz and a passband width of ~0.75 GHz fabricated on a substrate ~(45 × 11 × 1) mm3 in size with a permittivity of 80 is characterized by minimum loss in a passband of 0.5 dB. The parametric synthesis of the filter structure was performed using electrodynamic analysis of the 3D model. The measured characteristics of the test prototype agree well with the calculated data.

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Публикация на русском языке Микрополосковый трёхмодовый резонатор и миниатюрный фильтр на его основе со сверхширокой полосой пропускания [Текст] / Б. А. Беляев [и др.] // Докл. Акад. наук : Наука, 2017. - Т. 474 № 6. - С. 682-686

Держатели документа:
Kirenskii Institute of Physics, Federal Research Center, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian State Aerospace University named after Reshetnev, Krasnoyarsk, Russian Federation
Krasnoyarsk Science Center, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Khodenkov, S. A.; Leksikov, An. A.; Лексиков, Андрей Александрович; Shabanov, V. F.; Шабанов, Василий Филиппович
}
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Vyunishev, A. M.
Quasi-phase-matched second-harmonic generation in nonlinear crystals with harmonic modulation of nonlinearity / A. M. Vyunishev, V. G. Arkhipkin // Laser Phys. - 2020. - Vol. 30, Is. 4. - Ст. 045401, DOI 10.1088/1555-6611/ab7381. - Cited References: 20 . - ISSN 1054-660X
Кл.слова (ненормированные):
Efficiency -- Harmonic analysis -- Harmonic functions -- Modulation -- Nonlinear optics -- Phase matching -- Photonic crystals -- Harmonic modulations -- Nonlinear photonic crystals -- Periodic oscillation -- Quadratic nonlinearities -- Quasi phase matching -- Quasi-phase-matched -- Rectangular lattices -- Spatial modulations -- Harmonic generation
Аннотация: We propose a new type of nonlinear photonic crystal with the lattice representing a harmonic function of the propagation coordinate. This type of spatial modulation of the quadratic nonlinearity is implemented to enhance the second-harmonic generation (SHG) efficiency. The process resembles that realized in periodic nonlinear photonic crystals with rectangular nonlinearity modulation under quasi-phase-matching. Residual periodic oscillations of the second-harmonic intensity were found. Comparison of the unipolar and bipolar modulations showed that they are equivalent with regard to the oscillations. The SHG efficiency in the harmonic lattices is 1.6 times lower compared with the efficiency corresponding to the quasi-phase-matching in periodic nonlinear photonic crystals with rectangular lattices.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center Ksc Sb Ras, Krasnoyarsk, 660036, Russian Federation
Department of Photonics and Laser Technology, Siberian Federal University, Krasnoyarsk, 660079, Russian Federation

Доп.точки доступа:
Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Вьюнышев, Андрей Михайлович
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A METHOD FOR COMPUTING THE MICROWAVE ABSORPTION SPECTRUM IN A DISCRETE MODEL OF A FERROMAGNETIC [Text] / A. V. Izotov, B. A. Belyaev // Russ. Phys. J. - 2011. - Vol. 53, Is. 9. - P900-905, DOI 10.1007/s11182-011-9508-4. - Cited Reference Count: 8. - Гранты: The work was supported in part by the Federal Purpose-Oriented Program "Scientific and Scientific-Pedagogical Staff of the Innovative Russia" for the years 2009-2013, RAS Presidium Project No. 27, and by the State Contract No. 02.740.11.0568. - Финансирующая организация: Federal Purpose-Oriented Program; RAS Presidium [27]; State Contract [02.740.11.0568] . - FEB. - ISSN 1064-8887
Рубрики:

Кл.слова (ненормированные):
magnetization oscillation -- landau-lifshitz equation -- absorption spectrum -- absorption spectrum -- landau-lifshitz equation -- magnetization oscillation
Аннотация: An effective method based on linearization of the Landau-Lifshitz equation has been developed to determine normal magnetization oscillation modes in a discrete model of a condensed medium. The possibility to calculate microwave absorption spectra for ferromagnetic specimens of any shape is shown.

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

Доп.точки доступа:
Izotov, A.V.; Belyaev, B. A.; Беляев, Борис Афанасьевич
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Kolovsky, A. R.
Josephson oscillation in the open two-site Bose-Hubbard system / A. R. Kolovsky // Europhys. Lett. - 2022. - Vol. 139, Is. 5. - Ст. 50002, DOI 10.1209/0295-5075/ac8cae. - Cited References: 39. - The author thanks D. N. Maksimov for fruitful discussions and acknowledges financial support from the Russian Science Foundation through Grant No. 19-12-00167 . - ISSN 0295-5075
Аннотация: We analyze Josephson's oscillation of Bose particles in the open two-site Bose-Hubbard system. First, we excite the system from the vacuum state into a state suitable for observing the oscillation by using a special protocol for external driving. Next, we switch off the driving and observe the oscillation. It is shown that the main mechanism for the decay of Josephson's oscillation is the dephasing due to the fluctuating number of particles in open systems. An analytical estimate for the decay time is obtained.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Коловский, Андрей Радиевич
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    Стабилизация параметров механических колебаний образца в вибрационном магнитометре / Д. А. Великанов, Г. Ю. Юркин, Г. С. Патрин // Научное приборостроение. - 2008. - Т. 18, № 3. - С. 86-94 . - ISSN 0868-5886. - ISSN 2312-2951
   Перевод заглавия: Stabilization of sample mechanical oscilLation parameters in the vibrating magnetometer

УДК

621.317.444

Рубрики:

Аннотация: Предложена схема и описано устройство стабилизации параметров механических колебаний образца для высокотемпературного вибрационного магнитометра, в котором применен прямой метод измерений. Применение данного устройства позволяет существенно уменьшить погрешность измерений. Относительная нестабильность амплитуды колебаний составляет 10-4, а частоты - 10-5. Экспериментальная установка предназначена для проведения измерений магнитного момента образцов от 5•10-4 до 50 Гс•см3 в интервале температур 300-1000 К и магнитных полей 0-(±15) кЭ.
Scheme and structure of sample mechanical oscillation parameters stabilization for high temperature vibrating magnetometer in which direct measuring method is used is described. This device allows to reduce significantly error of measuring. The relative instability of vibration amplitude makes 10-4, and frequencies - 10-5. The experimental apparatus is intended for measuring of magnet moment of samples from 5•10-4 to 50 gs•cm3 in the range of temperatures 300-1000 K and magnetic fields 0-(±15) kOe.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН, г. Красноярск
Сибирский федеральный университет

Доп.точки доступа:
Великанов, Дмитрий Анатольевич; Velikanov, D. A.; Юркин, Глеб Юрьевич; Yurkin G. Yu.; Патрин, Г.С.
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Dual-mode split microstrip resonator for compact narrowband bandpass filters / V. V. Tyurnev, A. M. Serzhantov // Prog. Electromagn. Res. C. - 2011. - Vol. 23. - P151-160, DOI 10.2528/PIERC11062104 . - ISSN 1937-8718
Кл.слова (ненормированные):
1-d models -- average frequency -- dual modes -- dual-mode filter -- microstrip resonator -- narrow bands -- oscillation mode -- pass bands -- structure parameter -- transmission zeros -- bandpass filters -- frequency response -- natural frequencies -- resonators -- microstrip filters
Аннотация: A straight split dual-mode microstrip resonator is proposed. The frequencies of the two first oscillation modes in the resonator may be brought closer together by adjusting a split parameter whereas the frequency of the third mode remains approximately equal to the doubled average frequency of the first and the second modes. It is shown that formulas derived within 1D model give qualitatively true relations between the resonant frequencies and the structure parameters of the resonator. Examples of narrowband bandpass filters of the fourth and the sixth order are described. Transmission zeros below and above the passband substantially improve the filter's performance. The simulated frequency response of the three-resonator dual-mode filter is compared with the measured response of the fabricated filter.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Tyurnev, V. V.; Тюрнев, Владимир Вениаминович; Serzhantov, A. M.
}
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Highly selective suspended stripline dual-mode filter / B. A. Belyaev [et al.] // Prog. Electromagn. Res. Lett. - 2011. - Vol. 25. - P57-66 . - ISSN 1937-6480
Кл.слова (ненормированные):
band pass -- dual modes -- dual-mode filter -- filter construction -- filter performance -- fourth-order -- low insertion loss -- narrow band filter -- oscillation mode -- pass bands -- second orders -- special structure -- suspended stripline -- transmission zeros -- wide upper stopband -- frequency response -- resonators -- strip telecommunication lines -- bandpass filters
Аннотация: Miniature bandpass filter constructions based on a novel dual-mode suspended stripline resonator are proposed. Because of a special structure of the resonator, the frequencies of two first oscillation modes may be brought closer together. That allows realizing narrowband filters with the wide upper stopband. The filters have low insertion loss in the passband at small dimensions. Several transmission zeros substantially improve the filter performance. The derived coupling coeffcients account for some features in the frequency response of the filter. The second-order and fourth-order filters with transmission zeros have been fabricated and measured.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660074, Russian Federation

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Leksikov, A. A.; Лексиков, Александр Александрович; Tyurnev, V. V.; Тюрнев, Владимир Вениаминович; Serzhantov, A. M.; Сержантов, Алексей Михайлович
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10.

KIM, P. D.
CONSTRAINED OSCILLATION OF THE MAGNETIC DOMAIN-WALL ON HIGH-FREQUENCIES / P. D. KIM, D. C. HVAN // Fiz. Tverd. Tela. - 1982. - Vol. 24, Is. 8. - P. 2300-2304. - Cited References: 8 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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Доп.точки доступа:
HVAN, D. C.
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