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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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    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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Bulgakov, E. N.
Topological bound states in the continuum in arrays of dielectric spheres / E. N. Bulgakov, D. N. Maksimov // Phys. Rev. Lett. - 2017. - Vol. 118, Is. 26. - Ст. 267401, DOI 10.1103/PhysRevLett.118.267401. - Cited References:35. - This work was supported by Ministry of Education and Science of Russian Federation (State Contract No. 3.1845.2017/4.6). We appreciate discussions with Almas F. Sadreev. . - ISSN 0031-9007. - ISSN 1079-7114

РУБ Physics, Multidisciplinary
Рубрики:
SYMMETRY-PROTECTED MODES
   LIGHT
   SUBWAVELENGTH
   RESONANCE
Аннотация: We consider Bloch bound states in the radiation continuum in periodic arrays of dielectric spheres. It is demonstrated that the bound states are associated with phase singularities of the quasimode coupling strength. That makes the bound states topologically protected and, therefore, robust against any variation of parameters preserving the periodicity and rotational symmetry about the array axis. It is shown that under variation of parameters the bound states can only be destroyed by either annihilation of the topological charge or by migration to the sector of the parametric space where the second radiation channel is open.

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Держатели документа:
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.
RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Maksimov, D. N.; Максимов, Дмитрий Николаевич; Булгаков, Евгений Николаевич; Ministry of Education and Science of Russian Federation [3.1845.2017/4.6]
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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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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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Chubukov, A. V.
Theory of Raman response of a superconductor with extended s-wave symmetry: Application to the iron pnictides / A. V. Chubukov, I. . Eremin, M. M. Korshunov // Phys. Rev. B. - 2009. - Vol. 79, Is. 22. - Ст. 220501, DOI 10.1103/PhysRevB.79.220501. - Cited References: 48. - We acknowledge useful conversations with G. Blumberg, W. Brenig, H.-Y. Choi, D. V. Efremov, A. Sacuto, M. Vavilov, and A. Vorontsov. A. V. C. acknowledges support from NSF (Contract No. NSF-DMR 0604406). I. E. acknowledges partial support from the Asian-Pacific Center for Theoretical Physics, the Volkswagen Foundation (Contract No. I/82203), and the RMHE Program "Development of scientific potential" (Contract No. N1 2.1.1/298.5). M. M. K. acknowledges support from RFBR (Grant No. 09-02-00127) and RAS program on "Low temperature quantum phenomena." . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
LAYERED SUPERCONDUCTOR
SCATTERING
BA0.6K0.4FE2AS2
Аннотация: We argue that Raman study of Fe-pnictides is a way to unambiguously distinguish between various superconducting gaps proposed for these materials. We show that A(1g) Raman intensity develops a true resonance peak below 2 Delta if the pairing gap has A(1g) symmetry in the folded Brillouin zone (Delta(k=0)=Delta, Delta(pi, pi)=-Delta). No such peak develops for a pure s-wave gap, a d-wave gap, and an extended s-wave gap with Delta(k) =Delta cosk(x)/2cosk(y)/2. We show that the peak remains quite strong for the values of interpocket impurity scattering used to fit NMR data.

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Держатели документа:
[Chubukov, Andrey V.] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[Eremin, Ilya
Korshunov, Maxim M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Eremin, Ilya] Tech Univ Carolo Wilhelmina Braunschweig, Inst Math & Theoret Phys, D-38106 Braunschweig, Germany
[Korshunov, Maxim M.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, United States
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
Institute fur Mathematische und Theoretische Physik, TU Braunschweig, D-38106 Braunschweig, Germany
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Physics Department, Kazan State University, 420008 Kazan, Russian Federation

Доп.точки доступа:
Eremin, I.; Korshunov, M. M.; Коршунов, Максим Михайлович; NSF [DMR 0604406]; Asian-Pacific Center for Theoretical Physics; Volkswagen Foundation [I/82203]; RMHE Program "Development of scientific potential" [N1 2.1.1/298.5]; RFBR [09-02-00127]
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Aleksandrov, K. S.
The study of elastic symmetry and anisotropy of elastic body waves in gneiss / K. S. Aleksandrov, G. T. Prodayvoda // Geophysical Journal International. - 1994. - Vol. 119, Is. 3. - P. 715-728 . - ISSN 0956-540X
Кл.слова (ненормированные):
anisotropy -- Elastic Properties -- elastic symmetry -- Elastic Wave Velocity -- gneiss -- Gneiss -- phase velocity -- polarization -- Ultrasonics -- Europe, Baltic Shield
Аннотация: Describes a method for determining the effective elastic constants of anisotropic rocks from the results of ultrasonic measurements of the phase velocity of elastic body waves with arbitrary directions of the wave normal in the absence of a priori information on the texture symmetry. The proposed method has been applied to the results of ultrasonic measurements of a twice-deformed gneiss sample from the Lodogian series of the Baltic Shield. Experimental findings conform to triclinic symmetry. -from Authors

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Держатели документа:
Inst of Physics, Siberian Div of Russian Acad Sci, Akademgorodok, Krasnoyarsk, Russia

Доп.точки доступа:
Prodayvoda, G. T.; Александров, Кирилл Сергеевич
}
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10.

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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11.

Ovchinnikov, S. G.
The Interplay of Phonon and Magnetic Mechanism of Pairing in Strongly Correlated Electron System of High-T-c Cuprates / S. G. Ovchinnikov, E. I. Shneyder // J. Supercond. Nov. Magn. - 2010. - Vol. 23, Is. 5. - P. 733-736, DOI 10.1007/s10948-009-0633-z. - Cited References: 26. - This work is supported by the Presidium RAS program N 7 "Quantum physics of condensed matter," the integration project SORAN-UrORAN N 40, and the RFFI Grant 09-02-00127. . - ISSN 1557-1939

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   OXIDE SUPERCONDUCTORS
   SYMMETRY
   COPPER
   MODEL
   BAND
   BI2SR2CACU2O8+DELTA
   LA2-XSRXCUO4
   PB
Кл.слова (ненормированные):
High-T-c superconductivity -- Strong correlated electron systems -- Mechanisms of superconducting pairing -- High-T c superconductivity -- Mechanisms of superconducting pairing -- Strong correlated electron systems -- Ab initio -- Buckling mode -- Correlated electron systems -- Critical temperatures -- Cuprates -- Fitting parameters -- High-T -- Isotope effect -- Low energies -- Magnetic mechanisms -- Order of magnitude -- Phonon mode -- Strongly correlated electron system -- Strongly correlated electrons -- Superconducting pairing -- Superconductivity mechanism -- Type theory -- Buckling -- Copper compounds -- Electrons -- Isotopes -- Magnetic materials -- Phonons -- Superconductivity -- Superconducting magnets
Аннотация: We consider magnetic mechanism of superconducting pairing in the effective low energy t - t' - t '' - J* model with all parameters calculated ab initio. Interaction of strongly correlated electrons with different phonon modes is also incorporated. In a BCS type theory, the d(x2-y2) gap is given by a sum of magnetic and phonon contributions. The main contribution to the only fitting parameter G is determined by a competition of the breathing and buckling modes. Fitting the parameter G from the isotope effect, we obtain that magnetic and phonon contributions to the critical temperature T-c work together and are of the same order of magnitude.

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Держатели документа:
[Ovchinnikov, S. G.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, 660041 Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, 660014 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; 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.

Martynov, S. N.
The incommensurate magnetic structure of a tetragonal antiferromagnet with antisymmetric exchange / S. N. Martynov // J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 6. - P. 979-988, DOI 10.1134/S1063776109120097. - Cited References: 34 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
FLUCTUATION-INDUCED PHASE
   FIELD-INDUCED GAP
   COPPER METABORATE
   WEAK FERROMAGNETISM
   SOLITON LATTICE
   SPIN-WAVES
   CUB2O4
   BA2CUGE2O7
   CSCUCL3
   CHAINS
Кл.слова (ненормированные):
Anti-symmetric -- Antiferromagnetic sublattices -- Antiferromagnets -- Antisymmetric exchange -- Exchange bonds -- Ferromagnetic component -- Ferromagnetic moments -- Ginzburg-Landau functional -- Incommensurate magnetic structures -- Mean field approximation -- Modulation vectors -- Polarization planes -- Polarization vectors -- Symmetry groups -- Antiferromagnetic materials -- Antiferromagnetism -- Crystal orientation -- Crystal symmetry -- Ferromagnetic materials -- Ferromagnetism -- Magnetic devices -- Magnetic structure -- Modulation -- Polarization -- Vector spaces -- Vectors -- Crystallography
Аннотация: Analysis of the incommensurate magnetic structure that emerges for two coexisting types of the antisymmetric Dzyaloshinski-Moriya exchange interaction (the weakly ferromagnetic component of vector D along the tetragonal axis and the helicoidal component distributed in the tetragonal plane) is carried out for the first time for a tetragonal antiferromagnet. The helicoidal component for each pair of interacting spins has a 2D distribution; its direction in the tetragonal plane depends on the direction of the exchange bond in each pair. The Lifshits invariant of the Ginzburg-Landau functional is obtained, which is responsible for the formation of an incommensurate magnetic structure for such a distribution. It is shown in the mean field approximation that the incommensurate magnetic structure that forms in this case is a nonlinear double helicoid with a modulation vector lying in the tetragonal plane and with a varying angle between the polarization planes of quasi-antiferromagnetic sublattices. The ground state of the magnet is degenerate in the orientation of the modulation vector in the tetragonal plane. The rate of variation in the orientations of moments in the polarization planes passing through the tetragonal axis is controlled by the angle between the directions of the moments and the tetragonal axis. The local weakly ferromagnetic moment remaining in the polarization plane varies in magnitude and sign. The relation between the orientations of the modulation and polarization vectors is derived for the cases of simple and inversion tetragonal axes in the space symmetry group of the crystal.

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Russian Acad Sci, Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Мартынов, Сергей Николаевич
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14.

Korshunov, M. M.
The effective Hamiltonian of the singlet-triplet model for copper oxides / M. M. Korshunov, S. G. Ovchinnikov // Phys. Solid State. - 2001. - Vol. 43, Is. 3. - P. 416-419, DOI 10.1134/1.1356113. - Cited References: 15 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TC SUPERCONDUCTORS
   BAND-STRUCTURE
   LA2-XSRXCUO4
   MECHANISM
   SYMMETRY
   SPECTRUM
Аннотация: The effective Hamiltonian for a realistic multiband p-d model is developed. In the case of electron doping, the Hamiltonian coincides with that for the standard t-J model. For hole doping, the singlet-triplet t-J model takes place. (C) 2001 MAIK "Nauka/Interperiodica".

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Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk 660062, Russia
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Krasnoyarsk State University, Krasnoyarsk, 660062, Russian Federation
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Коршунов, Максим Михайлович
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15.

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

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

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

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

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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eLibrary
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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17.

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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18.

Ovchinnikov, S. G.
Symmetry of holes in high-temperature superconductors / S. G. Ovchinnikov // Solid State Commun. - 1991. - Vol. 77, Is. 3. - P. 221-224, DOI 10.1016/0038-1098(91)90336-T. - Cited References: 19 . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
FERMI-LIQUID STATES
   X-RAY ABSORPTION
   ELECTRONIC-STRUCTURE
   PHOTOEMISSION
   BI2SR2CACU2O8
   BISMUTH
Аннотация: A symmetry of holes is investigated in the multielectron band theory which takes into account strong correlations. It is shown that a small number of d(z2) states appears near the Fermi level due to d(z2) Cu-2p(x(y))O charge transfer as admixture to d(x2-y2)-p(x(y)) bands with dominant contribution of O2p states. The results are in a qualitative agreement with polarized photoemission data.

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

Доп.точки доступа:
Овчинников, Сергей Геннадьевич
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19.

Bulgakov, E. N.
Symmetry breaking in photonic crystal waveguide coupled with the dipole modes of a nonlinear optical cavity / E. N. Bulgakov, A. F. Sadreev // J. Opt. Soc. Am. B. - 2012. - Vol. 29, Is. 10. - P. 2924-2928. - Cited References: 17. - This work is partially supported by the Integration Project of the Siberian Branch of the Russian Academy of Sciences (RAS) (project no. 29) and the Russian Fund of Basic Research (RFBR) grant 12-02-000094. We thank D. N. Maksimov for assistance in the manuscript preparation. . - ISSN 0740-3224

РУБ Optics

Аннотация: We present stable symmetry breaking solutions in a nonlinear optical cavity with dipole eigenmodes embedded into the propagation band of a directional photonic crystal waveguide for symmetric injecting condition. We demonstrate how this phenomenon can be exploited for all-optical switching of light transmission from the one side of the waveguide to another by application of input pulses. When the light injected to both sides of the waveguide has equal intensities but different phases, we reveal a wealth of new solutions. (c) 2012 Optical Society of America

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Держатели документа:
[Bulgakov, Evgeny N.
Sadreev, Almas F.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Bulgakov, Evgeny N.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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20.

    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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