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Мельникова, Светлана Владимировна.
Влияние атмосферной влажности на симметрию и фазовые переходы слоистых калиевых оксифторидов K2NbOF5·H2O [] / С. В. Мельникова, Н. М. Лапташ // Физ. тверд. тела. - 2013. - Т. 55, Вып. 6. - С. 1142-1146. - Работа выполнена при финансовой поддержке гранта Президента РФ (НШ-4828.2012.2)
Аннотация: Выращены кристаллы K2NbOF5·H2O, проведены поляризационно-оптические исследования, измерены двулучепреломление и углы вращения оптической индикатрисы в интервале температур 100-400 K. Установлено, что при комнатной температуре этот слоистый кристалл в зависимости от степени влажности атмосферы может находиться в трех состояниях: A, B и C, различающихся симметрией и свойствами. Кристалл K2NbOF5·H2O в состоянии A, реализующийся при относительной влажности RH=90-100%, испытывает несобственный сегнетоэластический фазовый переход первого рода P 1=ftrightarrow C2/m, сопровождающийся сильными аномалиями оптических характеристик, двойникованием, появлением сдвиговой деформации x6 при температурах T2 downarrow ＝308 K и T2 uparrow ＝313 K. Наиболее устойчивое состояние K2NbOF5·H2O --- B (RH ＝20-90%) --- сохраняет моноклинную симметрию C2/m в области температур 100-370 K. В сухой атмосфере (RH ＝0-20%) или при T1~370 K кристалл становится безводным (K2NbOF5) с симметрией P4/nmm (состояние C). Различие кристаллов в состояниях A и B объясняется наличием или отсутствием молекул воды в межслоевых пространствах.20-90%) --- сохраняет моноклинную симметрию C2/m в области температур 100-370 K. В сухой атмосфере (RH ＝0-20%) или при T1~370 K кристалл становится безводным (K2NbOF5) с симметрией P4/nmm (состояние C). Различие кристаллов в состояниях A и B объясняется наличием или отсутствием молекул воды в межслоевых пространствах.

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Переводная версия Mel'nikova, S. V. Influence of atmospheric humidity on the symmetry and phase transitions of layered potassium oxyfluorides K2NbOF5 · H2O / S. V. Mel'nikova // Physics of the Solid State : Springer, 2013. - Vol. 55, Is. 6. - P.1231-1235

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

Доп.точки доступа:
Лапташ, Н. М.; Laptash, N. M.; Mel'nikova, S. V.
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X-ray study of phase transitions in CS3Sb2I9 crystal / B. S. Bagautdinov [et al.] // Solid State Commun. - 1999. - Vol. 111, Is. 7. - P. 361-366, DOI 10.1016/S0038-1098(99)00217-3. - Cited References: 4 . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
CS3BI2I9
Кл.слова (ненормированные):
ferroelectrics -- X-ray scattering -- phase transitions -- Crystal growth -- Ferroelectric materials -- Phase transitions -- Single crystals -- Thermal effects -- X ray scattering -- Trigonal symmetry -- Cesium compounds
Аннотация: An X-ray study of three phase transitions (PTs) at 86, 78 and 72 K has been carried out for the trigonal modification of the Cs3Sb2I9 crystal (space group P-3m1, a = 8.460 Angstrom, c = 10.398 Angstrom). The T-c1 = 86 K PT preserves the trigonal symmetry and is associated with the doubling of the c-parameter. At T-c2 = 72 K a doubling of a and b is observed. An intermediate incommensurate phase with q(1) = 1/2c*, q(2) = (1/2 - delta)a* + 1/2c* has been detected in the temperature range of 78-72 K. The lock-in PT at 72 K has a first order character. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.

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Держатели документа:
Russian Acad Sci, Inst Crystallog, Moscow 117333, Russia
Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Helsinki, FIN-00014 Helsinki, Finland
Univ Lausanne, Inst Christallog, CH-1015 Lausanne, Switzerland
ИФ СО РАН
Institute of Solid State Physics, RAS, 142432, Chernogolovka, Russian Federation
Institute of Crystallography, Russ. Acad. Sci., Leninski P., Moscow, Russian Federation
L.V. Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation
University of Helsinki, FIN-00014, Helsinki, Finland
Universite de Lausanne, Institut de Christallographie, 1015, Lausanne-Dorigny, Switzerland

Доп.точки доступа:
Bagautdinov, B. S.; Novikova, M. S.; Aleksandrova, I. P.; Александрова, Инга Петровна; Blomberg, M. K.; Chapuis, G.
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Violation of axial symmetry of optical properties in the trigonal crystal Nd:GdFe2.1Ga0.9(BO3)(4) / A. V. Malakhovskii [et al.] // Phys. Lett. A. - 2009. - Vol. 373, Is. 18-19. - P. 1683-1686, DOI 10.1016/j.physleta.2009.03.019. - Cited References: 16. - The work was supported by the Russian Foundation for Basic Researches, grant No 07-02-00704. . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
IRON BORATE GDFE3(BO3)(4)
Кл.слова (ненормированные):
Optical anisotropy -- Spectroscopy -- Rare earth compounds -- Transition metal compounds -- Optical anisotropy -- Rare earth compounds -- Spectroscopy -- Transition metal compounds
Аннотация: Strong dependence of birefringence and absorption spectra of d-d, f-f and charge transfer transitions on the direction of light beam in the plane perpendicular to the threefold crystallographic axis has been found out in trigonal crystal Nd:GdFe2.1Ga0.9(BO3)(4). X-ray measurements have shown that the crystal consists of inversion twins, whose formation is stimulated by the partial substitution of Fe by Ga. Observed violation of axial symmetry of the trigonal crystal optical properties is accounted for on the basis of assumption about stripe domain structure of the inversion twins. (c) 2009 Elsevier B.V. All rights reserved.

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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Zabluda, V. N.; Заблуда, Владимир Николаевич; Leont'ev, A. A.; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Researches [07-02-00704]
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Val'kov, V. V.
Symmetry properties of the phase of coexistence of superconductivity and antiferromagnetism in 2D systems with strong electron correlations / V. V. Val’kov, A. O. Zlotnikov // J. Surf. Invest. - 2016. - Vol. 10, Is. 1. - P. 58-67, DOI 10.1134/S1027451016010195. - Cited References: 33. - The work is supported by the Russian Foundation for Basic Research, project nos.13-02-00523 and 15-42-04372. A.O. Zlotnikov is also grateful for the Grant Program for Young PhDs supported by the President of the Russian Federation, project no. SP-1370.2015.5 . - ISSN 1027-4510
Кл.слова (ненормированные):
superconductivity -- antiferromagnetism -- two-dimensional systems -- strong electron correlations -- heavy fermions -- cerium-based intermetallic compounds -- periodic Anderson model
Аннотация: Using the diagram technique for Hubbard operators, the effect of quasi-two-dimensionality and hybridization of the 4f electrons of cerium ions and p electrons of indium ions on the properties of the antiferromagnetic, superconducting, and mixed phases in heavy-fermion intermetallic compounds of cerium is studied. It is shown that taking into account quasi-two-dimensionality, low-energy hybridization processes renormalize the antiferromagnetic and superconducting order parameters in the broken time-reversal symmetry phase. Estimates of the critical temperatures of antiferromagnetic ordering and Cooper instability, obtained by the developed approach, are in good agreement with experimental data for cerium-based intermetallic compounds. © 2016, Pleiades Publishing, Ltd.

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Публикация на русском языке Вальков, Валерий Владимирович. Симметрийные свойства фазы сосуществования сверхпроводимости и антиферромагнетизма в 2D системах с сильными электронными корреляциями [Текст] / В. В. Вальков, A. O. Злотников // Поверхность : Наука, 2016. - № 1. - С. 49-59

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович
}
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Val'kov, V. V.
Quantum fluctuations in a two-dimensional antiferromagnet with four-spin interaction of cubic symmetry / V. V. Val'kov, T. A. Val'kova, A. A. Shklyaev // Phys. Solid State. - 2011. - Vol. 53, Is. 10. - P. 2061-2066, DOI 10.1134/S1063783411100350. - Cited References: 13. - This study was supported by the Presidium of the Russian Academy of Sciences (Program "Quantum Physics of Condensed Matter"), the Siberian Branch of the Russian Academy of Sciences (Interdisciplinary Integration project no. 53), the Ministry of Education and Science of the Russian Federation (Russian Federal Targeted Program "Scientific and Scientific-Pedagogical Personnel of the Innovative Russia" in 2009-2013), and the Russian Foundation for Basic Research (project no. 09-02-00127). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
HEISENBERG-ANTIFERROMAGNET
TEMPERATURE
STATE
Аннотация: The excitation spectrum of a non-Heisenberg 2D antiferromagnet with the four-spin interaction of cubic symmetry has been calculated in the first order of 1/2S. It has been shown that, for weak anisotropy, the N,el state is destroyed by quantum fluctuations. The phase diagrams showing the stability regions of the N,el phase in the space of spin-anisotropy parameters have been plotted.

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Держатели документа:
[Val'kov, V. V.
Shklyaev, A. A.] Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Val'kova, T. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk 660014, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Val'kova, T. A.; Shklyaev, A. A.; Вальков, Валерий Владимирович
}
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Val'kov, V. V.
Anomalies in the characteristics of electronic structure upon a quantum phase transition to a state with two order parameters and the breaking of time-reversal symmetry / V. V. Val’kov, A. O. Zlotnikov // Bull. Russ. Acad. Sci. Phys. - 2016. - Vol. 80, Is. 6. - P. 616-619, DOI 10.3103/S106287381606040X. - Cited References: 9 . - ISSN 1062-8738
Кл.слова (ненормированные):
Antiferromagnetism -- Electronic structure -- Phase transitions -- Temperature distribution -- Antiferromagnetic order parameter -- Density of state -- Landau expansion -- Periodic Anderson model -- Quantum phase transitions -- Temperature dependence -- Time reversal symmetries -- Two order parameters -- Quantum theory
Аннотация: Based on the periodic Anderson model, microscopic expressions for the Ginzburg–Landau expansion coefficients in a phase with superconducting and antiferromagnetic order parameters are obtained. Temperature dependences of the order parameters near the temperature of the transition to this phase are established. The emergence of anomalous properties upon the quantum phase transition to the phase with two order parameters is investigated. This transition is accompanied by drastic reconstruction of the density of states, reflected by the interplay between superconductivity and antiferromagnetism. © 2016, Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Аномалии характеристик электронной структуры при квантовом фазовом переходе в состояние с двумя параметрами порядка и нарушенной симметрией относительно инверсии времени [Текст] / В. В. Вальков, А. О. Злотников // Изв. РАН. Сер. физ. - 2016. - Т. 80 № 6. - С. 683-686

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович
}
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    Ultra-narrow band blue emission of Eu2+ in halogenated (Alumino)borate systems based on high lattice symmetry / Y. Wei [et al.] // J. Am. Ceram. Soc. - 2019. - Vol. 102. - P. 2353– 2369, DOI 10.1111/jace.16127. - Cited References: 63. - This work was supported by the National Natural Science Foundation of China (Grant Nos. 51672259, 51672265, 21521092, 51750110511), Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences (Wuhan) (No. NGM2016KF002), the Ministry of Science and Technology of Taiwan (Contract No. MOST 104-2113-M-027-007-MY3), the Key Research Program of Frontier Sciences, CAS (Grant No. YZDY-SSW-JSC018), and projects for science and technology development plan of Jilin province (20170414003GH), the Program for Jiangmen Innovative Reasearch Team (No.[2017]385),major program of basic research and applied research of Guangdong Province (2017KZDXM083) and the Russian Science Foundation (Grant No. 17-12-01047). . - ISSN 0002-7820
   Перевод заглавия: Ультра-узкое синее излучение Eu2 + в галогенированных (алюмо)боратных системах с высокой решеточной симметрией
Кл.слова (ненормированные):
blue emission -- high symmetry -- phosphors -- ultra-narrow band -- WLEDs
Аннотация: Phosphor materials with ultra‐high color purity are highly desired in backlit display and WLEDs. How to achieve high‐purity three‐primary emission in rare earth ions activated inorganic phosphors has become a hot topic. Herein, we reported ultra‐narrow band and highly efficient blue‐violet‐emitting Eu2+‐doped Ba2B5O9X (fwhm = 31 nm) and NaBa4(AlB4O9)2X3 (X = Cl, Br) (fwhm = 43 nm) phosphors with peak positions around 424‐437 nm. Especially, the color purity of Ba2B5O9Cl:Eu sample even exceeded 97%, its internal quantum efficiency could achieve 87%. The EXANES analysis revealed that the Eu mainly existed in the form of +2. According to the Rietveld structural refinement, extraordinarily narrow band emission should be attributed to the highly symmetric lattice structures with the flower‐like polyhedrons in the studied (alumino)borate matrix. Significantly, the color gamut of as‐prepared blue phosphor combined with the standard green and red phosphors was almost close to that of Rec. 2020 display standard. In addition, cation substitution strategy in NaBa4(AlxB5‐xO9)2Cl3 (x = 0‐4) and NaBa4(GayB5‐yO9)2Cl3 (y = 0‐3) samples successfully achieved spectra adjustment, and the underlying mechanism was proposed. All these results demonstrate that the as‐prepared phosphors could be superior blue‐emitting candidates for backlit display as well as WLEDs.

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Держатели документа:
Faculty of Materials Science and Chemistry, Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan, China
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan
National Synchrotron Radiation Research Center, Hsinchu, Taiwan
School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong, China

Доп.точки доступа:
Wei, Y.; Qu, X.; Li, G.; Cheng, Z.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lin, C. C.; Chan, T. -S.; Chang, C. -K.; Chuang, Y. -C.; Lin, J.
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Tl-based high-T(C) superconductor with cubic symmetry / V. A. Volcov [et al.] // Int. J. Mod. Phys. B. - 1993. - Vol. 7, Is. 1-3. - P. 162-165, DOI 10.1142/S0217979293000366. - Cited References: 3 . - ISSN 0217-9792

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical

Аннотация: Ceramic samples of the system Tl-Pb-Sr-Ca-Ba-Cu-O-F have been prepared by modification of standard Tl-based ceramics by BaF2. A cubic structure with parameter a = 6.04 A is found by powder X-ray analysis. Both electric and magnetic data reveal superconductivity with T(ci) = 117 K. Electron conductivity is found at T = 300 K.

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Доп.точки доступа:
Volcov, V. A.; Kovalev, Y. G.; Ковалев Ю. Г.; Fokina, N. P.; Фокина Н. П.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Chernov, V. K.; Чернов, Владимир Кондратьевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; International conference on the physics of transition metals(1992 ; Jul ; 20-24 ; Darmstadt, Germany)
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Timofeev, I. V.
Chiral optical Tamm states at the boundary of the medium with helical symmetry of the dielectric tensor / I. V. Timofeev, S. Y. Vetrov // JETP Letters. - 2016. - Vol. 104, Is. 6. - P. 380-383, DOI 10.1134/S0021364016180119. - Cited References: 7. - This work was performed within the framework of the state assignment from the Ministry of Education and Science of the Russian Federation for R&D at the Siberian Federal University (assignment no. 3.1276.2014/K). . - ISSN 0021-3640
Аннотация: A new optical state at the boundary of a chiral medium whose dielectric tensor has a helical symmetry is described analytically and numerically. The case of zero tangential wavenumber is considered. The state localized near the boundary does not transfer energy along this boundary and decreases exponentially with the distance from the boundary. The penetration of the field into the chiral medium is blocked at wavelengths corresponding to the photonic band gap and close to the pitch of the helix. The polarization of light near the boundary has the same sign of chirality as the helical symmetry. It is shown that the homogeneous environment or a substrate should exhibit anisotropic metallic reflection. The spectral manifestation of the state is determined by the angle between the optical axes of the media at the interface. A state at the interface between a cholesteric liquid crystal and an anisotropic metal–dielectric nanocomposite was considered as an example. © 2016, Pleiades Publishing, Inc.

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Публикация на русском языке Тимофеев, Иван Владимирович. Хиральные оптические таммовские состояния на границе среды с винтовой симметрией тензора диэлектрической проницаемости [Текст] / И. В. Тимофеев, С. Я. Ветров // Письма в Журн. эксперим. и теор. физ. : Наука, 2016. - Т. 104 Вып. 5-6. - С. 393-397

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

Доп.точки доступа:
Vetrov, S. Ya.; Ветров, Степан Яковлевич; Тимофеев, Иван Владимирович
}
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10.

Three-center interactions and magnetic mechanism of superconductivity with dx2-y2-symmetry in the t-J*-model / V. V. Val'kov [et al.] // Mod. Phys. Lett. B. - 2003. - Vol. 17, Is. 10-12. - P. 441-449, DOI 10.1142/S0217984903005469. - Cited References: 12 . - ISSN 0217-9849

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
BAND HUBBARD-MODEL
Аннотация: The effect of three-center interactions on the formation of a superconducting phase with d(x2-y2)-symmetry is considered using the diagram technique for Hubbard operators and irreducible Green's functions. It is shown that these interactions lead to a decrease in T-c by a factor of several tens.

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Держатели документа:
Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
ИФ СО РАН

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Val'kova, T. A.; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; International Conference on Modern Problems in Superconductivity(3 ; 2002 ; Sept. ; 9-14 ; Yalta, Ukrain)
}
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11.

The strong effect of three-center interactions on the formation of superconductivity with d(x)(2)-y(2) symmetry in the t-J* model / V. V. Val'kov [et al.] // JETP Letters. - 2002. - Vol. 75, Is. 8. - P. 378-382, DOI 10.1134/1.1490003. - Cited References: 10 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary

Аннотация: The effect of three-center interactions on the formation of a superconducting phase with d(x)(2)-y(2) symmetry is considered using the diagram technique for Hubbard operators and irreducible Green's functions. It is shown that these interactions lead to a decrease in T-c by a factor of several tens.(C) 2002 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
ИФ СО РАН
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk Stt. Tech. University, Krasnoyarsk, 660074, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660075, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Val'kova, T. A.; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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12.

The influence of the quantum fluctuations on the ground state and spectral properties of 2D magnets with cubic symmetry four-spin exchange interactions [Text] / V. V. Valkov, T. A. Valkova, N. N. Jolobova // Moscow Int. Symp. on Magnet. (MISM-2008) : June 20-25, 2008, Moscow : book of abstract. - 2008. - Ст. 23PO-12-5. - p. 510-511. - This work was supported by the program of Presidium of RAS Quantum macrophysics, Russian Foundation for Basic Research (project no. 07-02-00226), and Integration project 3.4 SB RAS

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Valkov, V. V.; Вальков, Валерий, Владимирович; Valkova, T. A.; Jolobova, N. N.; Moscow International Symposium on Magnetism(4 ; 2008 ; Jun. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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13.

Synthesis and magnetic properties of MnGeO3 single crystals with orthorhombic structure / N. V. Sapronova [et al.] // J. Phys. Conf. Ser. - 2010. - Vol. 200, Is. SECTION 3, DOI 10.1088/1742-6596/200/3/032064 . - ISSN 1742-6588
Кл.слова (ненормированные):
Anisotropy field -- Flux methods -- Magnetic measurements -- Orthorhombic structures -- Orthorhombic symmetry -- Spin-flop transitions -- Crystal symmetry -- Magnetic fields -- Magnetic properties -- Single crystals
Аннотация: The current report is devoted to the study of magnetic properties of MnGeO3 single crystals with orthorhombic symmetry Pbca. MnGeO3 single crystals have been grown by a flux method. A new data of magnetic measurements in magnetic fields up to 80 kOe are presented. A spin-flop transition is observed at Hsf=35 kOe and T=4.2 K along a-axis. The exchange and anisotropy fields are determined. © 2010 IOP Publishing Ltd.

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

Доп.точки доступа:
Sapronova, N. V.; Balaev, A. D.; Балаев, Александр Дмитриевич; Sablina, K. A.; Саблина, Клара Александровна; Volkov, N. V.; Волков, Никита Валентинович; Vasilyev, A. D.; Васильев, Александр Дмитриевич
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14.

    Symmetry breaking in open quantum nonlinear systems / A. F. Sadreev [et al.] // Nonlinear phenomena in complex systems: from nano to macro scale : Springer, 2015. - P. 235-252. - (NATO science for peace and security series C: Environmental security)DOI 10.1007/978-94-017-8704-8_17 . - ISBN 978-94-017-8704-8. - ISBN 978-94-017-8703-1
   Перевод заглавия: Нарушение симметрии в открытых квантовых нелинейных системах
Аннотация: We consider symmetry breaking in the simplest open quantum nonlinear systems such as dimer and plaquette of four nonlinear sites coupled with linear tight-binding wires. If the solution is stationary, the total Hilbert space can be projected into the inner states of the dimer or plaquette by the Feshbach procedure. That derives a nonlinear analogue of the Lippmann-Schwinger equation with injected wave as a source. By neglecting radiation shifts the Lippmann-Scwinger equation limits to the coupled mode theory equations widely used in optics. We show three scenarios for the transmission through the nonlinear quantum systems. The first one inherits the linear case and preserves the symmetry. In the second scenario the symmetry is broken because of different intensities at the dimer sites. In the third scenario the intensities at the sites are equaled but phases of complex wave function are different. That results in a vortical power flow between the nonlinear sites similar to the DC Josephson current. We show how the phenomenon of symmetry breaking can used for switching of outputs symmetrically coupled to the quantum dimer . Also we reveal a domain in the parameter space where none of stationary solutions exist. As a result injection of a monochromatic symmetric wave gives rise to emission of nonsymmetric satellite waves with energies different from the energy of the incident wave. Thus, the response exhibits non monochromatic behavior.

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Inst Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Maksimov, D. N.; Максимов, Дмитрий Николаевич; Pichugin, K. N.; Пичугин, Константин Николаевич
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15.

Symmetry breaking in a T-shaped photonic waveguide coupled with two identical nonlinear cavities / E. Bulgakov, A. Sadreev // Phys. Rev. B Condens. Matter Mater. Phys. - 2011. - Vol. 84, Is. 15. - Ст. 155304. - P155304, DOI 10.1103/PhysRevB.84.155304 . - ISSN ISBN- 109
Аннотация: We consider light transmission in a T-shaped photonic waveguide coupled with two identical symmetrically positioned nonlinear microcavities. We present two types of symmetry breaking. The first one is a result of mixing of the symmetric input wave with antisymmetric bound states in the Fabry-Pérot interferometer architecture. Similarly, the second mechanism of the symmetry breaking is the result of mixing the symmetrical input wave with the antibonding bound state in a straight waveguide coupled with two cavities positioned perpendicular to the waveguide. In both cases the mixing is due to nonlinearity. In turn, the symmetry-breaking solutions give rise to nonsymmetrical outputs in the T-shape waveguide. These effects are directly demonstrated by the electromagnetic field solutions which are complimented by coupled mode theory for the light transmission. © 2011 American Physical Society.

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Держатели документа:
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk Rabochii, 31, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Bulgakov, E. N.; Булгаков, Евгений Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович
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16.

Symmetry breaking in a driven and strongly damped pendulum / J. . Isohatala [et al.] // Phys. Rev. E. - 2005. - Vol. 71, Is. 6. - Ст. 66206, DOI 10.1103/PhysRevE.71.066206. - Cited References: 37 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
DC VOLTAGE GENERATION
   SEMICONDUCTOR SUPERLATTICES
   JOSEPHSON-JUNCTIONS
   BLOCH OSCILLATIONS
   FORCED PENDULUM
   CHAOS
   FREQUENCY
   SYSTEMS
   RECTIFICATION
   STANDARD
Кл.слова (ненормированные):
Periodically driven pendulums -- Symmetry breaking -- Bifurcation (mathematics) -- Damping -- Dynamics -- Nonlinear systems -- Semiconductor superlattices -- Pendulums
Аннотация: We examine the conditions for appearance of a symmetry breaking bifurcation in damped and periodically driven pendulums in the case of strong damping. We show that symmetry breaking, unlike other nonlinear phenomena, can exist at high dissipation. We prove that symmetry breaking phases exist between phases of symmetric normal and symmetric inverted oscillations. We find that symmetry broken solutions occupy a smaller region of the pendulum's parameter space in comparison to the statements made in earlier considerations [McDonald and Plischke, Phys. Rev. B 27, 201 (1983)]. Our research on symmetry breaking in a strongly damped pendulum is relevant to an understanding of the phenomena of dynamic symmetry breaking and rectification in pure ac driven semiconductor superlattices.

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Держатели документа:
Univ Oulu, Dept Phys Sci, FIN-90014 Oulu, Finland
LV Kirenskii Inst Phys, Theory Nonlinear Proc Lab, Krasnoyarsk 660036, Russia
ИФ СО РАН
Department of Physical Sciences, P. O. Box 3000, Oulu FIN-90014, Finland
Theory of Nonlinear Processes Laboratory, Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Isohatala, J.; Alekseev, K. N.; Kurki, L. T.; Pietilainen, P.
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17.

Symmetry analysis of calculated vibrational spectra of Rb 2KScF6 crystal [Text] / A. S. Krylov [et al.] // Computational Materials Science. - 2006. - Т. 36, № 1-2. - P. 221-224, DOI 10.1016/j.commatsci.2005.06.002 . - ISSN 0927-0256. - ISSN 1879-0801

ГРНТИ

29.19

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Держатели документа:
Kirensky Institute of Physics
Universite du Maine
Доп.точки доступа:
Krylov, A. S.; Krylova, S. N.; Крылова Светлана Николаевна; Voronov, V. N.; Воронов Владимир Николаевич; Vtyurin, A. N.; Втюрин Александр Николаевич; Zamkova, N. G.; Замкова Наталья Геннадьевна; Bulou, A.
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18.

Structure and properties of exotic nano- and mesodiamonds with pentagonal symmetry / F. N. Tomilin, V. A. Pomogaev, Y. A. Melchakova [et al.] // Russ. Phys. J. - 2022. - Vol. 64, Is. 11. - P. 2046-2051, DOI 10.1007/s11182-022-02553-0. - Cited References: 16. - These results were obtained within the framework of the State Assignment of the Russian Ministry of Education and Science (No. 0721-2020-0033) . - ISSN 1064-8887
Кл.слова (ненормированные):
dodecahedral symmetry -- icosahedral symmetry -- twinned diamonds -- mesoparticles
Аннотация: A comprehensive critical survey of structures of exotic nano-, meso- and microdiamonds with dodecahedral and icosahedral symmetry (N/MDPS) is presented. Due to their high dodecahedral or icosahedral symmetry, the unique complex atomic and electronic structure of N/MDPS leads to transport and mechanical properties very promising for photonic, quantum, and nanomechanical applications. To explain the nature of diamonds, theoretical models have been proposed based on the formation of twinned structures consisting of either 5 or 20 symmetrically equivalent tetrahedral and prismatic fragments of the face-centered cubic lattice with the formation of star-shaped or icosahedral clusters, respectively. It has been shown that these twinned nano- and mesodiamonds have limited dimensions due to accumulation of uncompensated structural stresses arising from the deviation of the angles between diamond <111> facets from perfect 72° in tetrahedral fragments of the face-centered cubic lattice to 70.5° between five symmetrically equivalent twinned fragments.

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Публикация на русском языке Структура и свойства экзотических нано- и мезоалмазов пентагональной симметрии [Текст] / Ф. Н. Томилин, В. А. Помогаев, Ю. А. Мельчакова [и др.] // Изв. вузов. Физика. - 2021. - Т. 64 № 11. - С. 55-60

Держатели документа:
L. V. Kirensky Institute of Physics of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
National Research Tomsk State University, Tomsk, Russian Federation
Kyungpook National University, Daegu, South Korea
Novosibirsk State University, Novosibirsk, Russian Federation
Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation
Federal Research Center Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Siences, Novosibirsk, Russian Federation

Доп.точки доступа:
Tomilin, F. N.; Томилин, Феликс Николаевич; Pomogaev, V. A.; Melchakova, Y. A.; Artyushenko, P. V.; Shubin, A. A.; Volodin, A. M.; Zilberberg, I. L.; Avramov, P. V.
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19.

    Structural phase transitions and photoluminescence properties of Eu3+ doped Ca(2-x)BaxLaNbO6 phosphors / J. Zhu [et al.] // Dalton Trans. - 2015. - Vol. 44, Is. 42. - P. 18536-18543, DOI 10.1039/c5dt03430b. - Cited References: 27. - The present work was supported by the National Natural Science Foundation of China (Grant No. 51272027, 51472028 and 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306) . - ISSN 1477-9226
   Перевод заглавия: Структурные фазовые переходы и фотолюминесцентные свойства люминофоров Ca(2-x)BaxLaNbO6 допированных Eu3+

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
Double-perovskite
   Luminescence properties
   Thermal-stability
   Crystal-chemistry
   Red phosphors
   White LEDs
   Symmetry
   Band
   Ta
   Ln
Аннотация: Crystal structures of the series of double perovskites Ca(2-x)BaxLaNbO6:Eu3+ phosphors have been examined by powder X-ray diffraction and Rietveld refinements. Ca2LaNbO6 has a monoclinic (P21/n) and Ba2LaNbO6 has a monoclinic (C2/m) structure. The structural phases of Ca(2-x)BaxLaNbO6:Eu3+ samples are divided into three sections depending on different Ca/Ba ratios: (1) monoclinic phase (P21/n) as Ca2LaNbO6 in the range of x = 0-0.1, (2) mixed phases containing Ca2LaNbO6 and Ba2LaNbO6 between 0.15 and 1.2, and (3) monoclinic phase (C2/m) as Ba2LaNbO6 for x = 1.4-2. Eu3+ ions act as the structural probes to study the structural phase transitions, and the evolution of the photoluminescence properties and thermal stability behaviours has been also comparatively investigated depending on different structural symmetries from Ca2LaNbO6 to Ba2LaNbO6 phase. The strong red emission from 5D0-7F2 peaking at 618 nm can be found in Ca2LaNbO6:Eu3+ phosphors, which is attributed to the low crystal field effect of the activator ions located in the highly distorted [Lao8] polyhedra sites. The composition-optimized phosphors can find applications in white light emitting diodes (LEDs).

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Держатели документа:
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, China
School of Materials Sciences and Technology, China University of Geosciences, Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation

Доп.точки доступа:
Zhu, J.; Xia, Zhiguo; Zhang, Y.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Q.
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20.

Sorokin, B. P.
Influence of non-homogeneous uniaxial pressure on the propagation of bulk acoustic waves in crystals / B. P. Sorokin, A. N. Marushyak, K. S. Aleksandrov // Proc Annu IEEE Int Freq Control Symp. - 2000. - P. 404-409 . - ISBN 0161-6404
Кл.слова (ненормированные):
Acoustic bulk wave devices -- Calculations -- Crystal defects -- Crystal symmetry -- Functions -- Pressure effects -- Tensors -- Cubic crystal -- Green-Christoffel equation -- Uniaxial mechanical pressure -- Acoustic wave propagation
Аннотация: The development of the theory of propagation small amplitude bulk acoustic waves in crystals under the uniaxial mechanical pressure has made by taking into account the condition of non-homogeneous deformation of crystal sample. It has been shown that the path of bulk acoustic waves will be function of a kind non-homogeneous deformation. As an example the calculation for some crystal directions of cubic crystal Bi12GeO20 (23 point symmetry) has made.

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Доп.точки доступа:
Marushyak, A. N.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; IEEE Annual frequency control symposium(54 ; 2000 ; Jun. ; 7-9 ; Kansas)
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