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Влияние дальних взаимодействий на механизм куперовской неустойчивости Кона-Латтинжера в модели Шубина-Вонсовского / М. Ю. Каган [и др.] // Письма в Журн. эксперим. и теор. физ. - 2013. - Т. 97, Вып. 4. - С. 253-259DOI 10.7868/S0370274X13040127
Аннотация: На основе механизма Кона-Латтинжера в модели Шубина-Вонсовского при учете межузельного кулоновского взаимодействия электронов из первой и второй координационных сфер исследована проблема куперовской неустойчивости. Показано, что учет ренормировок Кона-Латтинжера для эффективного взаимодействия во втором порядке теории возмущений, а также включение перескоков электронов между узлами, относящимися ко второй и третьей координационным сферам, существенно сказывается на конкуренции между сверхпроводящими фазами с dxy-, p-, s- и dx2-y2-симметриями параметра порядка.

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Переводная версия Effect of long-range interactions on the Kohn-Luttinger mechanism of the cooper instability in the Shubin-Vonsowsky model. - [Б. м. : б. и.]

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

Доп.точки доступа:
Каган, Максим Юрьевич; Вальков, Валерий Владимирович; Val'kov, V.V.; Мицкан, Виталий Александрович; Mitskan, V.A.; Коровушкин, Максим Михайлович; Korovushkin, M.M.
}
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Effect of long-range interactions on the Kohn-Luttinger mechanism of the cooper instability in the Shubin-Vonsowsky model / M. Yu. Kagan [et al.] // JETP letters. - 2013. - Vol. 97, Is. 4. - P. 226-232DOI 10.1134/S0021364013040085
Аннотация: The problem of Cooper instability is studied by implementing the Kohn–Luttinger mechanism in the frame-work of the Shubin–Vonsowsky model taking into account the intersite Coulomb interactions within the first and second coordination spheres. It is shown that the Kohn–Luttinger renormalization for the effective interaction in the second order terms of perturbation theory, as well as the inclusion of intersite hoppings in the second and third coordination spheres, significantly affects the interplay between the superconducting phases with dxy-, p-, s-, and dx2-y2 -wave symmetries of the order parameter.

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Публикация на русском языке Влияние дальних взаимодействий на механизм куперовской неустойчивости Кона-Латтинжера в модели Шубина-Вонсовского. - [S. l. : s. n.]

Держатели документа:
Russian Acad Sci, Kapitza Inst Phys Problems, Moscow 119334, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Kagan, M.Yu.; Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович
}
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    Magnetoelastic interactions in Raman spectra o Ho1-xNdxFe3(Bo3)4 crystals / A. S. Krylov [et al.] // Solid State Commun. - 2013. - Vol. 174. - P. 26-29, DOI 10.1016/j.ssc.2013.09.011 . - ISSN 0038-1098
   Перевод заглавия: Магнитоэластическое взаимодействие в спектрах комбинационного рассеяния света в кристаллах Ho1−xNdxFe3(BO3)4
Аннотация: Raman scattering spectra of Ho1−xNdxFe3(BO3)4 (x=0, x=0.22) crystals have been studied within 10–400 K temperature range. Structural phase transition was found under cooling at 366 K and 203 K respectively. Considerable modification in Raman spectra of the mixed crystal was found to be induced by magnetic ordering below Neel temperature. Results are interpreted using empirical simulation of crystal lattice dynamics and Raman intensities.

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Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Sofronova, S. N.; Софронова, Светлана Николаевна; Gudim, I. A.; Гудим, Ирина Анатольевна; Vtyurin, A. N.; Втюрин, Александр Николаевич
}
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    Korshunov, M. M.
    Three-orbital model for Fe-pnictides / M. M. Korshunov, Y. N. Togushova, I. Eremin // J. Supercond. Nov. Magn. - 2013. - Vol. 26, Is. 8. - P. 2665-2668, DOI 10.1007/s10948-013-2156-x . - ISSN 1557-1939
   Перевод заглавия: Трехорбитальная модель ферропниктидов
Кл.слова (ненормированные):
Fe-based superconductors -- Low-energy model -- Spin susceptibility -- Fe-based superconductors -- Iron-based superconductors -- Pairing interactions -- Spin susceptibility -- High temperature superconductors -- Magnetic susceptibility -- Superconductivity
Аннотация: We formulate and study the three-orbital model for iron-based superconductors. Results for the band structure, Fermi surface, and the spin susceptibility in both normal and superconducting s В± states are presented. We also discuss the pairing interaction and show that the dominant part of it should come from the intraorbital scattering. В© 2013 Springer Science+Business Media New York.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Ruhr Univ Bochum, Inst Theoret Phys 3, D-44801 Bochum, Germany
Kazan Fed Univ, Kazan 420008, Russia

Доп.точки доступа:
Togushova, Yu. N.; Eremin, I.; Коршунов, Максим Михайлович
}
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Investigation of the special features of the coupling coefficients for microstrip asymmetric hairpin resonators at frequencies of the second passband / B. A. Belyaev [et al.] // Rus. Phys. J. - 2013. - Vol. 55, Is. 10. - P. 1215-1221, DOI 10.1007/s11182-013-9945-3 . - ISSN 1064-8887
Кл.слова (ненормированные):
coupling coefficient -- frequency response -- high-temperature superconductor -- inductive and capacitive interactions -- microstrip resonator
Аннотация: The behavior of the frequency-dependent coupling coefficients is investigated for a pair of microstrip resonators formed by conductors shaped as an asymmetrical hairpin. It is demonstrated that the total coupling coefficient of the resonators in a two-pole filter becomes close to zero in the region of the frequency of the second resonance due to mutual compensation for inductive and capacitive interactions. This allows a device for protection against high-power radio pulse to be developed based on such resonators with additional hairpin resonator containing control element manufactured from high-temperature superconductor (HTS) film. В© 2013 Springer Science+Business Media New York.

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

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Govorun, I. V.; Говорун, Илья Валерьевич; Leksikov, Al. A.; Лексиков, Александр Александрович; Serzhantov, A. M.; Сержантов, Алексей Михайлович
}
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Magnetism and magnetoresistance in NiFe/Bi/NiFe films / K. G. Patrin [et al.] // Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P. 439-442, DOI 10.4028/www.scientific.net/SSP.190.439 . - ISBN 1012-0394. - ISBN 9783037854365
Кл.слова (ненормированные):
Antiferromagnetic interaction -- Bi spacer -- Hysteresis loop -- Interlayer coupling -- Magnetization -- Magnetoresistance -- Permalloy -- Trilayer films -- Antiferro-magnetic interactions -- Giant magnetoresistive -- Interlayer coupling -- Interlayer interactions -- Permalloy -- Spacer thickness -- SQUID magnetometry -- Trilayer film -- Trilayers -- Antiferromagnetism -- Bismuth -- Giant magnetoresistance -- Hysteresis loops -- Magnetic materials -- Magnetic resonance -- Magnetization -- Magnetoresistance -- Electric resistance
Аннотация: Interlayer interactions in FeNi/Bi/FeNi trilayers have been experimentally studied. Based on the data of SQUID magnetometry and magnetic resonance investigations, it is shown that the interlayer interaction is determined by a bismuth spacer thickness and temperature. The giant magnetoresistive effect in the trilayer films has been discovered. В© (2012) Trans Tech Publications.

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Доп.точки доступа:
Patrin, K. G.; Патрин, Константин Геннадьевич; Yakovchuk, V.Yu.; Яковчук, Виктор Юрьевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Yarikov, S. A.; Moscow International Symposium on Magnetism(5 ; 2011 ; Aug. ; 21-25 ; Moscow)
}
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Evolution of symmetry and structure of the gap in Fe-based superconductors with doping and interactions / А. Chubukov [et al.] // Bull. Amer. Phys. Soc. - 2012. - Vol. 57, № 1. - P. 316
Аннотация: We present a detailed study of the symmetry and structure of the pairing gap in Fe-based superconductors. We treat them as quasi-2D systems, decompose the pairing interaction into s− wave and d− wave channels and into contributions from scattering between different Fermi surfaces and analyze how each scattering evolves with doping and input parameters. We verify that each interaction is well approximated by the lowest angular harmonics and use this simplification to analyze the interplay between the interaction with and without spin-fluctuation components, the origin of the attraction in the s± and d x 2 −y 2 channels, the competition between them, the nature of angular dependence of the s± gaps along the electron Fermi surface, the conditions under which s± gap develops nodes, and the origin of superconductivity in heavily electron- or hole-doped systems, when only Fermi surfaces of one type are present. In particular, we find that with increased electron and hole doping, the competition from d− wave grows. In the case of strong hole doping, there is some ambiguity over the leading solution, but in the case of strong electron doping, d− wave emerges as clear winner.

Материалы конференции,
Аннотация
Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Chubukov, A. V.; Maiti, S.; Korshunov, M. A.; Коршунов, Михаил Анатольевич; Maier, T.; Hirschfeld, P.J.; APS March Meeting (2012 ; 27 Feb.-2 March ; Boston, Massachusetts, USA); American Physical Society March Meeting (2012 ; 27 Feb.-2 March ; Boston, Massachusetts, USA)
}
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Korshunov, M. M.
Evolution of the Superconducting State of Fe-Based Compounds with Doping, Interactions, and Disorder / M. M. Korshunov // International conferences «Phase separation and Superstripes in High Temperature Superconductors and Related Materials (Superstripes-2012)». - 2012. - P. 39
Аннотация: We introduce an effective low-energy pairing model for Fe-based superconductors with s- and d-wave interaction components and a small number of input parameters and use it to study the doping evolution of the symmetry and the structure of the superconducting gap. We argue that the model describes the entire variety of pairing states found so far in the Fe-based superconductors and allows one to understand the mechanism of the attraction in s(±) and d(x(2)-y(2)) channels, the competition between s- and d-wave solutions, and the origin of superconductivity in heavily doped systems, when only electron or only hole pockets are present.

Программа конференции

Доп.точки доступа:
Коршунов, Максим Михайлович; Ettore Majorana Foundation, Centre for Scientific CultureRome International Center for Materials Science; International School of Solid State Physics; "Phase separation and Superstripes in High Temperature Superconductors and Related Materials", Int. Conf. (55 ; 2012 ; July ; 11-17 ; Erice (Sicily), Italy)
}
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Interlayer interactions in FeNi/Bi/FeNi trilayers / G. S. Patrin [и др.] // Bull. Russ. Acad. Sci.: Phys. - 2012. - Vol. 76, Is. 2. - P. 177-179. - Cited References: 5. - This study was supported by the Russian Foundation for Basic Research, project no. 110200675a. . - ISSN 1062-8738
Кл.слова (ненормированные):
Giant magnetoresistance effect -- Interlayer interactions -- Spacer thickness -- SQUID magnetometry -- Trilayers -- Magnetic resonance -- Bismuth
Аннотация: Interlayer interactions in FeNi/Bi/FeNi films are studied experimentally. It is established by SQUID magnetometry and magnetic resonance investigations that the interlayer interaction in these films is determined by the bismuth spacer thickness and temperature. A giant magnetoresistance effect is observed in the investigated trilayers. © 2012 Allerton Press, Inc.

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Публикация на русском языке Исследование межслоевых взаимодействий в трехслойных пленках FeNi/Bi/FeNi [Текст] / Г. С. Патрин [и др.] // Изв. РАН. Сер. физич. - 2012. - Т. 76 № 2. - С. 205-207

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

Доп.точки доступа:
Patrin, G. S.; Патрин, Геннадий Семёнович; Yakovchuk, V.Yu.; Яковчук, Виктор Юрьевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Patrin, K. G.; Патрин, Константин Геннадьевич; Yarikov, S. A.; Яриков, Станислав Алексеевич
}
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10.

Phase transitions and crystal-field and exchange interactions in TbFe3(BO3)4 as seen via optical spectroscopy / M. N. Popova [et al.] // J. Phys.: Condens. Matter. - 2012. - Vol. 24, Is. 19. - Ст. 196002, DOI 10.1088/0953-8984/24/19/196002. - Cited References: 45. - The assistance of E P Chukalina is acknowledged. This work was supported in part by the Russian Foundation for Basic Research (grants No 10-02-01071-a and No 09-02-00171-a), by the Ministry of Education and Science (grant HIII-4828.2012.2), and by the Russian Academy of Sciences under the Programs for Basic Research. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
IRON BORATE GDFE3(BO3)4
PROBE
ION
Аннотация: High-resolution polarized broadband (1800–23 000 cm−1) optical absorption spectra of Tb3+ in TbFe3(BO3)4 single crystals are studied between room temperature and 4.2 K. The spectral signatures of the structural (R32–P3121, TS = 192 K) and magnetic (TN = 41 K) phase transitions are found and analyzed. Energies and symmetries of the Tb3+ crystal-field (CF) levels were determined for both the high-temperature R32 and the low-temperature P3121 structures of TbFe3(BO3)4 and compared with the calculated ones. It follows unambiguously from the spectral data that the ground state is the Γ1 + Γ2 quasi-doublet of the local D3 point symmetry group for Tb3+ in the R32 high-temperature structure. The CF calculations revealed the CF parameters and wavefunctions for Tb3+ in TbFe3(BO3)4. The value of the Tb–Fe exchange integral and of the effective magnetic field created by the ordered Fe subsystem were estimated as Jfd = 0.26 K and Beff = 3.92 T, using the observed splitting Δ = 32 cm−1 of the Tb3+ ground quasi-doublet at the temperature 5 K. The reliability of the obtained parameters was proven by modeling the literature data on the magnetic susceptibility of TbFe3(BO3)4. Lattice distortions below TS were evidenced by the observed changes of probabilities of the forced electric dipole transitions of Tb3+.

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Держатели документа:
[Popova, M. N.] Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia
[Stanislavchuk, T. N.] New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA
[Malkin, B. Z.] Kazan Fed Univ, Kazan 420008, Russia
[Bezmaternykh, L. N.] RAS, Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Popova, M. N.; Stanislavchuk, T. N.; Malkin, B. Z.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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11.

Golovnev, N.
Bridging behaviour of the 2-thiobarbiturate anion in its complexes with LiI and NaI / N. Golovnev, M. Molokeev // Acta Crystallographica Section C Crystal Structure Communications. - 2013. - Vol. 69, Pt. 7. - P. 704-708, DOI 10.1107/S0108270113014078 . - ISSN 0108-2701
Кл.слова (ненормированные):
2-thiobarbituric acid -- Coordinated water -- Dihydrates -- Edge sharing -- Hydrogen bonding interactions -- Three-dimensional networks -- Atoms -- Complex networks -- Hydrogen bonds -- Ligands -- Negative ions -- Positive ions -- Three dimensional -- Lithium
Аннотация: The structures of the LiI and NaI salts of 2-thiobarbituric acid (2-sulfanylidene-1-3-diazinane-4,6-dione, H 2TBA) have been studied. μ-Aqua-octaaquabis(μ-2- thiobarbiturato-κ2 O:O′)bis(2-thiobarbiturato-κO) tetralithium(I) dihydrate, [Li4(C4H3N 2O2S)4(H2O)9]·2H 2O, (I), crystallizes with four symmetry-independent four-coordinated LiI cations and four independent HTBA- anions. The structure contains two structurally non-equivalent LiI cations and two non-equivalent HTBA- anions (bridging and terminal). Eight of the coordinated water ligands are terminal and the ninth acts as a bridge between LiI cations. Discrete [Li4(HTBA)4(H2O)9] ·2H2O complexes form two-dimensional layers. Neighbouring layers are connected via hydrogen-bonding interactions, resulting in a three-dimensional network. Poly[μ2-aqua-tetraaqua(μ4-2- thiobarbiturato-κ4 O:O:S:S)(μ2-thiobarbiturato- κ2 O:S)disodium(I)], [Na2(C4H 3N2O2S)2(H2O) 5] n , (II), crystallizes with six-coordinated NaI cations. The octahedra are pairwise connected through edge-sharing by a water O atom and an O atom from the μ4-HTBA- ligand, and these pairs are further top-shared by the S atoms to form continuous chains along the a direction. Two independent HTBA- ligands integrate the chains to give a three-dimensional network. © 2013 International Union of Crystallography.

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Держатели документа:
Siberian State Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич
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12.

Crystal field and exchange interactions in the SmFe3(BO3)4 multiferroic / M. N. Popova [et al.] // J. Exp. Theor. Phys. - 2014. - Vol. 118, Is. 1. - P. 111-123, DOI 10.1134/S1063776114010142. - Cited References: 22. - This work was supported by the Russian Foundation for Basic Research (project no. 13-02-00787) and the basic research program Quantum Mesoscopic and Disordered Structures of the Presidium of the Russian Academy of Sciences. . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary

Аннотация: The optical spectra of oriented SmFe3(BO3)4 single crystals are studied in the region of the f-f transitions in the Sm3+ ion by Fourier spectroscopy. The energies, the symmetry properties, and the exchange splittings of the Stark sublevels of the ground and 17 excited multiplets of the Sm3+ ion in a crystal field of symmetry D 3 are determined from the measured temperature dependences of polarized-radiation absorption spectra. The parameters of the crystal field acting on samarium ions and the parameters of the exchange interaction between Sm3+ and Fe3+ ions are found. The anisotropy of the effective exchange interaction is shown to be substantially stronger than the magnetic anisotropy, due to a strong crystal-field-induced mixing of the ground and excited multiplets.

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Публикация на русском языке Исследование кристаллического поля и обменных взаимодействий в мультиферроике SmFe3( BO3)4 [Текст] / М. Н. Попова [и др.] // Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 145 Вып. 1. - С. 128-142

Держатели документа:
Russian Acad Sci, Inst Spect, Moscow 142190, Russia
Kazan Privolzhsky Fed Univ, Kazan 420008, Russia
State Univ, Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Oblast, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Popova, M. N.; Chukalina, E. P.; Malkin, B. Z.; Erofeev, D. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Research [13-02-00787]; basic research program Quantum Mesoscopic and Disordered Structures of the Presidium of the Russian Academy of Sciences
}
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13.

    The Kohn-Luttinger superconductivity in idealized doped graphene / M. Y. Kagan [et al.] // Solid State Commun. - 2014. - Vol. 188. - P. 61-66, DOI 10.1016/j.ssc.2014.03.001. - Cited References: 31. - This work was supported by the Program of the Division of Physical Sciences of the Russian Academy of Sciences (Project 11.3.1), and the Russian Foundation for Basic Research (Projects 14-02-00058 and 14-02-31237). One of the authors (M.M.K.) acknowledges the support of the Council of the President of the Russian Federation (Project MK-526.2013.2), and the Dynasty Foundation. . - ISSN 0038-1098. - ISSN 1879-2766
   Перевод заглавия: Сверхпроводимость Кона-Латтинжера в идиализированном допированном графене

РУБ Physics, Condensed Matter
Рубрики:
REPULSIVE INTERACTIONS
   HUBBARD-MODEL
   SUPERFLUIDITY
   INSTABILITY
   MECHANISM
   DENSITY
   SYSTEMS
Кл.слова (ненормированные):
Graphene -- Superconductivity
Аннотация: Idealized graphene monolayer is considered neglecting the van der Waals potential of the substrate and the role of the nonmagnetic impurities. The effect of the long-range Coulomb repulsion in an ensemble of Dirac fermions on the formation of the superconducting pairing in a monolayer is studied in the framework of the Kohn-Luttinger mechanism. The electronic structure of graphene is described in the strong coupling Wannier representation on the hexagonal lattice. We use the Shubin-Vonsowsky model which takes into account the intra- and intersite Coulomb repulsions of electrons. The Cooper instability is established by solving the Bethe-Salpeter integral equation, in which the role of the effective interaction is played by the renormalized scattering amplitude. The renormalized amplitude contains the Kohn-Luttinger polarization contributions up to and including the second-order terms in the Coulomb repulsion. We construct the superconductive phase diagram for the idealized graphene monolayer and show that the Kohn-Luttinger renormalizations and the intersite Coulomb repulsion significantly affect the interplay between the superconducting phases with f-, d+id-, and p+ip-wave symmetries of the order parameter. (C) 2014 Elsevier Ltd. All rights reserved.

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Держатели документа:
PL Kapitsa Phys Problems Inst, Moscow 119334, Russia
Natl Res Univ, Higher Sch Econ, Moscow Inst Elect & Math, Moscow 109028, Russia
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Kagan, M. Y.; Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Program of the Division of Physical Sciences of the Russian Academy of Sciences [11.3.1]; Russian Foundation for Basic Research [14-02-00058, 14-02-31237]; Council of the President of the Russian Federation [MK-526.2013.2]; Dynasty Foundation
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14.

Infrared absorption spectrum of HoFe3(BO3)4 crystal / S. N. Sofronova [et al.] // Vib. Spectrosc. - 2014. - Vol. 72. - P. 20-25, DOI 10.1016/j.vibspec.2014.02.005. - Cited References: 18. - The work was partially supported by the RFBR through Grants No. 13-02-00825 and 13-02-98041, SS-4828.2012.2. . - ISSN 0924-2031. - ISSN 1873-3697

РУБ Chemistry, Analytical + Chemistry, Physical + Spectroscopy
Рубрики:
MAGNETOELASTIC INTERACTIONS
IRON
GDFE3(BO3)4
Кл.слова (ненормированные):
Holmium ferroborate -- Infrared absorption
Аннотация: Infrared (IR) absorption spectra of HoFe3(BO3)4 crystal have been obtained in spectral range 30–7000 cm−1 at temperatures from 4 to 423 K. Vibrational frequencies have been simulated with ‘Lady’ software package both for high-temperature and low-temperature phases. The experimental spectra have been analyzed on the basis of calculated data, and interpreted within the framework of internal vibrations of ionic complexes of HoFe3(BO3)4 crystal lattice. The spectral range under study was observed to have no Davydov splitting of internal vibrational modes due to unit cell multiplication. No effects of magnetic ordering on the IR spectra of the crystal under study were observed in the low-temperature range.

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Держатели документа:
Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Gerasimova, Y. V.; Герасимова, Юлия Валентиновна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Shestakov, N. P.; Шестаков, Николай Петрович; Ivanenko, A. A.; Иваненко, Александр Анатольевич; RFBR [13-02-00825, 13-02-98041, SS-4828.2012.2]
}
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15.

Aver'yanov, E. M.
Anisotropy of dipole-dipole interactions in ferroelectric langmuir films of poly(vinylidene fluoride-trifluoroethylene) / E. M. Aver'yanov // JETP Letters. - 2014. - Vol. 99, Is. 10. - P. 590-593, DOI 10.1134/S0021364014100026. - Cited References: 12 . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
LOCAL-FIELD
BLODGETT-FILMS
COPOLYMER
Аннотация: The Lorentz tensor components L (j) for poly(vinylidene fluoride-trifluoroethylene, 70/30) Langmuir-Blodgett films in the ferroelectric phase are determined experimentally. The results indicate that intralayer dipole-dipole interaction between the segments of the polymer is stronger than interlayer interaction. This conclusion agrees with the absence of the critical film thickness below which ferroelectricity would cease to exist.

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Публикация на русском языке Аверьянов, Евгений Михайлович. Анизотропия диполь-дипольных взаимодействий в сегнетоэлектрических лэнгмюровских пленках поли(винилиденфторид-трифторэтилена) [Текст] / Е. М. Аверьянов // Письма в Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 99 Вып. 10. - С. 679-682

Доп.точки доступа:
Аверьянов, Евгений Михайлович
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16.

The Kohn-Luttinger effect and anomalous pairing in new superconducting systems and graphene / M. Y. Kagan [et al.] // J. Exp. Theor. Phys. - 2014. - Vol. 118, Is. 6. - P. 995-1011, DOI 10.1134/S1063776114060132. - Cited References: 114. - This study was supported by the Program of the Physics Department of the Russian Academy of Sciences (project no. P.3.1) and the Russian Foundation for Basic Research (project nos. 14-02-00058 and 14-02-31237). The work of two coauthors (M. M. K. and V.A.M) was supported financially by grant no. MK-526.2013.2 of the President of the Russian Federation and the Dynasty Foundation. . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
Рубрики:
P-WAVE SUPERCONDUCTIVITY
   EXTENDED HUBBARD-MODEL
   NARROW ENERGY-BANDS
   2D KONDO-LATTICE
   FERMI GAS
   REPULSIVE INTERACTIONS
   ELECTRON CORRELATIONS
   COOPER INSTABILITY
   PHASE-DIAGRAM
   SPECTRUM
Аннотация: We present a review of theoretical investigations into the Kohn-Luttinger nonphonon superconductivity mechanism in various 3D and 2D repulsive electron systems described by the Fermi-gas, Hubbard, and Shubin-Vonsovsky models. Phase diagrams of the superconducting state are considered, including regions of anomalous s-, p-, and d-wave pairing. The possibility of a strong increase in the superconducting transition temperature T c even for a low electron density is demonstrated by analyzing the spin-polarized case or the two-band situation. The Kohn-Luttinger theory explains or predicts superconductivity in various materials such as heterostructures and semimetals, superlattices and dichalcogenides, high-T c superconductors and heavy-fermion systems, layered organic superconductors, and ultracold Fermi gases in magnetic traps. This theory also describes the anomalous electron transport and peculiar polaron effects in the normal state of these systems. The theory can be useful for explaining the origin of superconductivity and orbital currents (chiral anomaly) in systems with the Dirac spectrum of electrons, including superfluid 3He-A, doped graphene, and topological superconductors.

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Публикация на русском языке Эффект Кона-Латтинжера и аномальное спаривание в новых сверхпроводящих системах и графене [Текст] / М. Ю. Каган [и др.] // Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 118 Вып. 6. - С. 1127-1146

Держатели документа:
Russian Acad Sci, Kapitza Inst Phys Problems, Moscow 119334, Russia
Natl Res Univ, Higher Sch Econ, Moscow State Inst Elect & Math, Moscow 109028, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Kagan, M. Y.; Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Physics Department of the Russian Academy of Sciences [P.3.1]; Russian Foundation for Basic Research [14-02-00058, 14-02-31237]; Russian Federation [MK-526.2013.2]; Dynasty Foundation
}
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17.

Long-range chemical interactions in solid-state reactions: effect of an inert Ag interlayer on the formation of L10-FePd in epitaxial Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1) trilayers / V. G. Myagkov [et al.] // Philos. Mag. - 2014. - Vol. 94, Is. 23. - P. 2595-2622, DOI 10.1080/14786435.2014.926037. - Cited References: 117 . - ISSN 1478-6435. - ISSN 1478-6443

РУБ Materials Science, Multidisciplinary + Mechanics + Metallurgy & Metallurgical Engineering + Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SYNTHESIS
   THIN-FILMS
   PHASE-FORMATION
   MAGNETIC-PROPERTIES
   X-RAY
   MARTENSITIC TRANSFORMATIONS
   PHOTOELECTRON-SPECTROSCOPY
   STRUCTURAL CHARACTERISTICS
   CASIMIR FORCE
   GOLD-FILMS
Кл.слова (ненормированные):
Fe-Pd system -- epitaxial thin film -- inert Ag buffer layer -- diffusion -- solid-state reactions -- L1(0) -- long-range chemical interactions
Аннотация: The effect of 0, 0.5, and 1 μm-thick Ag interlayers on the chemical interaction between Pd and Fe in epitaxial Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1)/MgO(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1)/MgO(0 0 1) trilayers has been studied using X-ray diffraction, 57Fe Mössbauer spectroscopy, X-ray photoelectron spectroscopy, and magnetic structural measurements. No mixing of Pd and Fe occurs via the chemically inert Ag layer at annealing temperatures up to 400 °C. As the annealing temperature is increased above 400 °C, a solid-state synthesis of an ordered L10-FePd phase begins in the Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1) film trilayers regardless of the thickness of the buffer Ag layer. In all samples, annealing above 500 °C leads to the formation of a disordered FexPd1−x(0 0 1) phase; however, in samples lacking the Ag layer, the synthesis of FexPd1−x is preceded by the formation of an ordered L12-FePd3 phase. An analysis of the X-ray photoelectron spectroscopy results shows that Pd is the dominant moving species in the reaction between Pd and Fe. According to the preliminary results, the 2.2 μm-thick Ag film does not prevent the synthesis of the L10-FePd phase and only slightly increases the phase’s initiation temperature. Data showing the ultra-fast transport of Pd atoms via thick inert Ag layers are interpreted as direct evidence of the long-range character of the chemical interaction between Pd and Fe. Thus, in the reaction state, Pd and Fe interact chemically even though the distance between them is about 104 times greater than an ordinary chemical bond length.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660049, Russia

Доп.точки доступа:
Myagkov, V. G.; Мягков, Виктор Григорьевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Mikhlin, Y. L.; Михлин, Юрий Леонидович; Zhigalov, V. S.; Жигалов, Виктор Степанович; Bykova, L. E.; Быкова, Людмила Евгеньевна; Bondarenko, G. N.; Бондаренко, Галина Николаевна
}
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18.

Martynov, S. N.
Incommensurate magnetic structures in the rhombohedrally distorted cubic lattice / S. N. Martynov // Solid State Phenom. : Selected, peer reviewed papers. - 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P. 61-65, DOI 10.4028/www.scientific.net/SSP.215.61. - Cited References: 8 . - ISSN 978-30383. - ISSN 1662-9779
Кл.слова (ненормированные):
Frustration of exchange interactions -- Incommensurate magnetic structures
Аннотация: The ground state of a rhombohedrally distorted magnetic cubic lattice with frustrated exchange in the thriangular base plane of spins and competition of exchanges between the nearest and next nearest planes was investigated. The dependence of helix vector components on the exchange parameters was calculated. The phase diagram of ground state was obtained. © (2014) Trans Tech Publications, Switzerland.

Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Samardak, A. \ed.\; Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; sept. ; 15-21 ; Vladivostok)
}
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19.

    Long-range chemical interactions in solid-state reactions: Effect of an inert Ag interlayer on the formation of L10-FePd in Epitaxial Pd(001)/Ag(001)/Fe(001) and Fe(001)/Ag(001)/Pd(001) trilayers [Текст] / V. G. Myagkov [и др.] // International Symposium on the Reactivity of Solids. [[b]]ISRS-18[[/b]], 9—13 June 2014, Saint Petersburg, Russia : Book of Abstracts. - 2014. - P133 . - ISBN 978-5-9651-0838-1
   Перевод заглавия: Дальнодействующие химические взаимодействия в твердофазных реакциях: влияние инертного Ag слоя на формирование L10-FePd в эпитаксиальных Pd(001)/Ag(001)/Fe(001) и Fe(001)/Ag(001)/Pd(001) трехлойных пленках.
Аннотация: Diffusion is one of the unique phenomena that control major natural processes. It is a basic contributor to chemical reactions and structural transformations in solids.[1,2] Solid-state reactions, including those occurring in thin films and multilayers, comprise three successive stages: (1) breakage of reagent chemical bonds, (2) diffusion transfer of reagent atoms via a reaction product, and (3) rearrangement and formation of new bonds. The reaction rate is determined by step 2, which is the primary stage. Traditionally, solid-state diffusion of reacting atoms via a layer of a reaction product is considered to occur through an atomic exchange with nearest neighbors that leads to their random walk over a crystal lattice. The mean distance d that an atom moves over time t equals the mean-square atomic displacement 〈∆x2〉 and satisfies the Einstein equation d = 〈∆x2〉 = 2Dt. In numerous studies on solid-state reactions in thin films and multilayers, the parabolic growth of the reaction layer thickness d which satisfies the Einstein equation is presented as experimental proof of the diffusive nature of the reaction.

Book of Abstracts

Доп.точки доступа:
Myagkov, V. G.; Мягков, Виктор Григорьевич; Bykova, L. E.; Быкова, Людмила Евгеньевна; Zhigalov, V. S.; Жигалов, Виктор Степанович; Bon, G. N.; Бондаренко, Галина Николаевна; International Symposium on the Reactivity of Solids (18 ; 2014 ; Saint Petersburg)
}
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20.

Rasskazov, I. L.
Surface plasmon polaritons in linear chains of silver nanospheroids / I. L. Rasskazov, S. V. Karpov, V. V. Markel // 10th Edition of the International Conference Series on Laser-light and Interactions with Particles (LIP-2014) : Book of extended abstracts. - 2014. - P. 6.1-6.3

Материалы конференции

Доп.точки доступа:
Karpov, S. V.; Карпов, Сергей Васильевич; Markel, V. V.; Рассказов, Илья Леонидович; Edition of the International Conference Series on Laser-light and Interactions with Particles (10 ; 2014 ; Aug. ; 25-29 ; Marseille, France)
}
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