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    Magnetic mechanisms of pairing in strongly correlated electron system of copper oxides / S. G. Ovchinnikov [et al.] // arXiv. - 2015. - Ст. eprint arXiv:1510.08640. - Cited References: 214. - The authors acknowledge support from FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK 16.740.12.0731 and GK 16.740.11.0740), RFBR (Grants 12-02-31534 and 12-02-31597), Siberian Federal University (Theme #F-11), Governmental support of leading scientific schools of Russia (NSh-1044.2012.2), Program of SB RAS #44, Presidium of RAS program #20.7. EIS, IAM, and MMK are grateful to The Dynasty Foundation and ICFPM forthe financial support. - In book.: Recent advances in superconductivity research", ed. by C.B. Taylor, 321 p., Nova Science Publishers Inc. New York, 2013 ISBN: 978-1-62618-406-0, Chapter 6
Рубрики:
Condensed matter--Strongly correlated electrons
   Superconductivity
Кл.слова (ненормированные):
strong electronic correlations -- cuprates -- Hubbard operators -- electronic structure -- quantum phase transitions -- magnetic mechanism of pairing
Аннотация: The multielectron LDA+GTB approach has been developed to calculate electronic structure of strongly correlated cuprates. At low energies the effective Hamiltonian of the t−t′−t"−t⊥−J∗−J⊥-model has been derived with parameters coming from the ab initio calculation for LSCO. The electronic structure of LSCO has been calculated self-consistently with the short-range antiferromagnetic order for various doping level. Two Lifshitz-type quantum phase transitions with Fermi surface topology changes have been found at dopings xc1=0.15 and xc2=0.24. Its effect on normal and superconducting properties has been calculated. The interatomic exchange parameter and its pressure dependence has been calculated within LDA+GTB scheme. The magnetic mechanisms of d-wave pairing induced by static and dynamical spin correlations are discussed. Simultaneous treatment of magnetic and phonon pairing results in the conclusion that both contributions are of the same order. For two layer cuprates like YBCO the interlayer hopping and exchange effects on the electronic structure and doping dependence of Tc is discussed as well as the Coulomb interaction induced mechanism of pairing.

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Makarov, I. A.; Макаров, Илья Анатольевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Togushova, Yu.N.; Тогушова Ю.Н.; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Korshunov, M. M.; Коршунов, Максим Михайлович
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    Euro-asian symposium "Trends in magnetism" (EASTMAG-2004) : Abstract book / Рос. акад. наук, Сиб. отд-ние, Ин-т физики им. Л.В. Киренского, Краснояр. гос. ун-т, Краснояр. гос. технич. ун-т, Урал. отд-ние , Ин-т физики металлов. Euro-asian symp. "Trends in magnetism" ; предс. орг. комит. К. С. Александров ; зам. предс. С. Г. Овчинников ; чл. орг. комит. В. А. Игнатченко [и др.]. - Krasnoyarsk : [б. и.], 2004. - 418 с. - Bibliogr. at the end of the articles - Auth. ind. - 350 экз. - Б. ц.
Перевод заглавия: Евро-азиатский симпозиум "Прогресс в магнетизме"
Приложение:
Program of Euro-asian symposium "Trends in magnetism" (EASTMAG-2004). - Krasnoyarsk : Kirensky Instit. Phys. SB RAS, 2004. - 83
    Содержание:
Fundamental magnetic properties
Transport phenomena and spin electronics
Magnetism and strongly correleted electron systems
Spin glasses, disordered magnetic systems
Dynamics of spin systems and magnetic resonances
Magnetooptics and X-ray magnetooptics
Magnetic mechanism of the superconductivity
Domain structure and magnetization processes
Thin magnetic films and multilayers
Magnetic particles and nanocrystalline materials
Molecular magnetism
Magnetic storage/memory and applications
   Перевод заглавия: Евро-азиатский симпозиум "Прогресс в магнетизме"

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

Доп.точки доступа:
Александров, Кирилл Сергеевич \предс. орг. ком.\; Aleksandrov, K. S.; Овчинников, Сергей Геннадьевич \зам. предс.\; Ovchinnikov, S. G.; Игнатченко, Вальтер Алексеевич \чл. орг. ком.\; Ignatchenko, V. A.; Сапожников, В. \чл. орг. ком.\; Патрин, Геннадий Семёнович \чл. орг. ком.\; Patrin, G. S.; Вальков, Валерий Владимирович \чл. орг. ком.\; Val'kov, V. V.; Волков, Никита Валентинович \чл. орг. ком.\; Volkov, N. V.; Казак, Наталья Валерьевна \чл. орг. ком.\; Kazak, N. V.; Российская академия наук; Сибирское отделение РАН; Институт физики им. Л.В. Киренского Сибирского отделения РАН; Красноярский государственный университет; Красноярский государственный технический университет; Институт физики металлов Уральского отделения РАН; Научный совет по физике конденсированных сред РАН; Научный совет РАН по физике низких температур; Красноярский научный центр Сибирского отделения РАН; Euro-asian symposium "Trends in magnetism" (2 ; 2004 ; Aug. 24-27 ; Krasnoyarsk); "Trends in magnetism", Euro-Asian Symposium (2 ; 2004 ; Aug. 24-27 ; Krasnoyarsk)
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Inverted opals as the Josephson networks of weak links / S. I. Popkov [et al.] // The International conference on strongly correlated electron systems (SCES2017) : abstracts. - 2017. - Ст. Th-3-44

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Доп.точки доступа:
Popkov, S. I.; Попков, Сергей Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Bykov, A. A.; Быков, Алексей Анатольевич; Mistonov, A.; Shabanov, A. V.; Шабанов, Александр Васильевич; Terentiev, K. Yu.; Терентьев, Константин Юрьевич; International conference on strongly correlated electron systems(2017 ; 17-21 July ; Prague)
}
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Angle-resolved reflection spectroscopy of high-quality PMMA opal crystal / I. V. Nemtsev [et al.] // Photonics Nanostruc. Fundam. Appl. - 2018. - Vol. 28. - P. 37-44, DOI 10.1016/j.photonics.2017.11.007. - Cited References: 72. - This study was supported by the Russian Foundation for Basic Research (Grant No. 16-32-00302 мол_а ), by the Council for Grants of the President of the Russian Federation ( SP-317.2015.1 ), by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 16-42-243059 р_мол_а and No. 16-48-242092 р_офи_м, and by the Program of Foundation for Promotion of Small Enterprises in Science and Technology (No.6662ГУ2015) (“УМНИК” program). We acknowledge the support of Krasnoyarsk Regional Center for Collective Use of SB of RAS for equipment and technique. We thank A. V. Shabanov and O. V. Shabanova for assistance in dispersion preparation. We also thank V. G. Myagkov for useful discussion of the results. . - ISSN 1569-4410
Кл.слова (ненормированные):
PMMA opal -- Photonic crystal -- Electron microscopy -- Angular resolved reflective spectroscopy
Аннотация: PMMA opal crystal was prepared by a simple hybrid method, which includes sedimentation, meniscus formation and evaporation. We investigated three surfaces of this crystal by angle-resolved reflective light spectroscopy and SEM study. The angle-resolved reflective measurements were carried out in the 400–1100 nm range. We have determined the high-quality ordered surface of the crystal region. Narrow particle size distribution of the surface has been revealed. The average particle diameter obtained with SEM was nearly 361 nm. The most interesting result was that reflectivity of the surface turned out up to 98% at normal light incidence. Using a fit of dependences of the maximum reflectivity wavelength from an angle based on the Bragg–Snell law, the wavelength of maximum 0° reflectivity, the particle diameter and the fill factor have been determined. For the best surface maximum reflectivity wavelength of a 0° angle was estimated to be 869 nm. The particle diameter and fill factor were calculated as 372 nm and 0.8715, respectively. The diameter obtained by fitting is in excellent agreement with the particle diameter obtained with SEM. The reflectivity maximum is assumed to increase significantly when increasing the fill factor. We believe that using our simple approach to manufacture PMMA opal crystals will significantly increase the fabrication of high-quality photonic crystal templates and thin films

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Держатели документа:
Federal Research Centre Krasnoyarsk Scientific Center of the Siberian Branch of Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Centre Krasnoyarsk Scientific Center of the Siberian Branch of Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Nemtsev, I. V.; Немцев, Иван Васильевич; Tambasov, I. A.; Тамбасов, Игорь Анатольевич; Ivanenko, A. A.; Иваненко, Александр Анатольевич; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
}
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    Inhomogeneity of the magnetic state in the Pr1-xSrxMnO3/YSZ films studied by electron magnetic resonance / Yu. E. Samoshkina [et al.] // Int. Workshop on Phase Transit. and Inhomogeneous States in Oxides : book of abstracts / чл. орг. ком. I. N. Flerov. - Kazan, 2017. - P. 29. - Библиогр.: 4. - The work was supported by the Russian Foundation for Basic Researches, Grant No. 16-32-00209 mol_a and the Grant of the President of the Russian Federation no. NSh-7559.2016.2
   Перевод заглавия: Неоднородность магнитных состояний в Pr1-xSrxMnO3/YSZ пленках, изученная с помощью электронного магнитного резонанса

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Доп.точки доступа:
Flerov, I. N. \чл. орг. ком.\; Флёров, Игорь Николаевич; Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Andreev, N. V.; Андреев Н. В.; Chichkov, V. I.; Чичков В.И.; International Workshop on Phase Transitions and Inhomogeneous States in Oxides(2017 ; june ; 25-30 ; Kazan); "Фазовые переходы и неоднородные состояния в оксидах", международный семинар(2017 ; июнь ; 25-30 ; Казань)
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Si/Fe flux ratio influence on growth and physical properties of polycrystalline β-FeSi2 thin films on Si(100) surface / I. A. Tarasov [et al.] // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 144-152, DOI 10.1016/j.jmmm.2016.12.084. - Cited References:39. - This work was supported by the Russian Science Foundation, project no. 16-13-00060 . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SEMICONDUCTING FESI2 FILMS
SPECTROSCOPIC ELLIPSOMETRY
EPITAXIAL-FILMS
Кл.слова (ненормированные):
β-FeSi2 iron disilicide -- Optical properties -- Reflection high-energy -- electron diffraction -- Raman spectroscopy -- ab initio calculation
Аннотация: This work investigates the Si/Fe flux ratio (2 and 0.34) influence on the growth of β-FeSi2 polycrystalline thin films on Si(100) substrate at 630 °C. Lattice deformations for the films obtained are confirmed by X-ray diffraction analysis (XRD). The volume unit cell deviation from that of β-FeSi2 single crystal are 1.99% and 1.1% for Si/Fe =2 and Si/Fe =0.34, respectively. Absorption measurements show that the indirect transition (~ 0.704 eV) of the Si/Fe =0.34 sample changes to the direct transition with a bandgap value of ~0.816 eV for the sample prepared at Si/Fe =2. The absorption spectrum of the Si/Fe =0.34 sample exhibits an additional peak located below the bandgap energy value with the absorption maximum of ~0.36 eV. Surface magneto-optic Kerr effect (SMOKE) measurements detect the ferromagnetic behavior of the β-FeSi2 polycrystalline films grown at Si/Fe =0.34 at T=10 K, but no ferromagnetism was observed in the samples grown at Si/Fe =2. Theoretical calculations refute that the cell deformation can cause the emergence of magnetization and argue that the origin of the ferromagnetism, as well as the lower absorption peak, is β-FeSi2 stoichiometry deviations. Raman spectroscopy measurements evidence that the film obtained at Si/Fe flux ratio equal to 0.34 has the better crystallinity than the Si/Fe =2 sample.

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Доп.точки доступа:
Tarasov, I. A.; Тарасов, Иван Анатольевич; Visotin, M. A.; Высотин Максим Александрович; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Kosyrev, N. N.; Косырев, Николай Николаевич; Yakovlev, I. A.; Яковлев, Иван Александрович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lukyanenko, A. V.; Лукьяненко, Анна Витальевна; Krylov, A. S.; Крылов, Александр Сергеевич; Fedorov, A. S.; Федоров, Александр Семенович; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Science Foundation [16-13-00060]; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
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    Sokolov, V. V.
    Magnetic circular dichroism spectra and electron structure of ErAl3(BO3)4 single crystal / V. V. Sokolov, A. V. Malakhovskii, I. A. Gudim // Moscow Int. Symp. on Magnet. (MISM-2017) : 1-7 July 2017 : book of abstracts / чл. междунар. конс. комитета С. Г. Овчинников ; чл. нац. конс. комитета Н. В. Волков. - 2017. - Ст. 32PO-12-5. - P. 588. - Cited References: 1
   Перевод заглавия: Московский международный симпозиум по магнетизму

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Доп.точки доступа:
Овчинников, Сергей Геннадьевич \чл. междунар. конс. комитета\; Ovchinnikov, S. G.; Волков, Никита Валентинович \чл. нац. конс. комитета\; Volkov, N. V.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gudim, I. A.; Гудим, Ирина Анатольевна; Соколов, Валерий Владимирович; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
}
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Makarov, I. A.
Temperature dependent polaronic band structure in the 3band P-D model with strong electron-phonon interaction / I. A. Makarov, S. G. Ovchinnikov, E. I. Shneyder // Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 4TL-P-1. - P. 696

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Макаров, Илья Анатольевич; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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Reflection electron energy loss spectroscopy of structures based on silicon and transition metals / A. S. Parshin [et al.] // IOP Conf. Ser.: Mater. Sci. Eng. - 2017. - Vol. 255, Is. 1. - Ст. 012019, DOI 10.1088/1757-899X/255/1/012019. - Cited References: 24
Кл.слова (ненормированные):
Dissociation -- Electron emission -- Electron energy levels -- Electron scattering -- Electrons -- Energy dissipation -- Iron -- Iron compounds -- Silicides -- Silicon compounds -- Transition metals
Аннотация: The investigation of iron silicides FeSi2, FeSi and Fe5Si3 with the methods of reflection electron energy loss spectroscopy and inelastic electron scattering cross-section spectroscopy was carried out. It is shown that the shape and peak energy position of electron energy loss spectra are almost identical to silicides with different composition, while the amplitude of inelastic electron scattering cross-section spectra decreases with increasing of iron content. The decomposition of inelastic electron scattering cross-section spectra of FeSi2, FeSi and Fe5Si3 to Tougaard peaks is used for unresolved energy loss peaks analysis, determination its energies and identification bulk and surface peaks. The amplitude of fitting peak describing bulk plasmon excitation can be used for identification of the iron silicides with different composition.

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Доп.точки доступа:
Parshin, A. S.; Паршин, Анатолий Сергеевич; Igumenov, A. Y.; Mikhlin, Y. L.; Михлин, Юрий Леонидович; Pchelyakov, O. P.; Zhigalov, V. S.; Жигалов, Виктор Степанович; International Scientific Conference Reshetnev Readings(20 ; 2016 ; Nov. 9-12 ; Krasnoyarsk)
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10.

EPR-determined anisotropy of the g-factor and magnetostriction of a Cu2MnBO5 single crystal with a ludwigite structure / A. A. Dubrovskiy [et al.] // JETP Letters. - 2017. - Vol. 106, Is. 11. - P. 716-719, DOI 10.1134/S0021364017230072. - Cited References:18. - This study was supported jointly by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Territory (project no. 16-42-243028). . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
ELECTRON-SPIN-RESONANCE
Аннотация: Electron paramagnetic resonance (EPR) and magnetostriction of the Cu2MnBO5 single crystal have been studied. The EPR spectrum consists of a single Lorentzian line due to the exchange-coupled system of spins of Cu2+ and Mn3+ ions. It has been established experimentally that the g-factor in the paramagnetic region is strongly anisotropic and anomalously small, which is not typical of the exchange-coupled system of spins of Cu2+ and Mn3+ ions. At a temperature of 150 K, the g-factors along the crystallographic a, b, and c axes are 2.04, 1.96, and 1.87, respectively. Such small effective g-factor values can be due to the effect of the anisotropic Dzyaloshinskii-Moriya exchange interaction between the spins of Cu2+ and Mn3+ ions directed along the a axis. The presence of two Cu2+ and Mn3+ Jahn-Teller ions occupying four nonequivalent positions in the crystal is responsible for the absence of the inversion center. It is found that the behavior of the magnetostriction of Cu2MnBO5 is not typical of transition-metal crystals but is closer to the behavior of crystals containing rare-earth ions.

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Публикация на русском языке Анизотропия g-фактора, определенная методом ЭПР, и магнитострикция монокристалла Cu2MnBO5 со структурой людвигита [Текст] / А. А. Дубровский [и др.] // Письма в Журн. эксперим. и теор. физ. - 2017. - Т. 106 Вып. 11. - С. 685-688

Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr KRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Zavoisky Phys Tech Inst, Kazan 420029, Russia.

Доп.точки доступа:
Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Moshkina, E. M.; Мошкина, Евгения Михайловна; Yatsyk, I. V.; Eremina, R. M.; Russian Foundation for Basic Research; Government of the Krasnoyarsk Territory [16-42-243028]
}
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