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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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