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Ovchinnikov, S. G.
Temperature and field dependent electronic structure and magnetic properties of LaCoO3 and GdCoO3 / S. G. Ovchinnikov, Yu. S. Orlov, V. A. Dudnikov ; Moscow international symposium on magnetism (5th ; August 21–25, 2011 ; Moscow) // J. Magn. Magn. Mater. - 2012. - Vol. 324, Is. 21. - P. 3584-3587, DOI 10.1016/j.jmmm.2012.02.096. - Cited References: 25. - We acknowledge discussions with G.A. Sawatzky, M.W. Haverkort, S.V. Nikolaev and V.A. Gavrichkov. This work is supported by the Siberia-Urals integration project no. 44, SBRAS project no. 38, Presidium RAS Program 20, RFBR Grant no. 10-02-00251. . - ISSN 0304-8853

РУБ Physics, Condensed Matter + Materials Science, Multidisciplinary
Рубрики:
SPIN-STATE TRANSITION
CHARGE
Кл.слова (ненормированные):
Electronic structure -- Spin crossover -- Insulator-metal transition
Аннотация: The transformation of the band structure of LaCoO3 in the applied magnetic field has been theoretically studied. If the field is below its critical value B-C approximate to 65 T, the dielectric band gap decreases with the field, thus giving rise to negative magnetoresistance that is highest at T approximate to 300 divided by 500 K. The critical field is related to the crossover between the low- and high-spin terms of Co3+ ions. The spin crossover results in an insulator-metal transition induced by an increase in the magnetic field. Similar calculations have been done for GdCoO3 which is characterized by large spin gap similar to 2000K. (C) 2012 Elsevier B.V. All rights reserved.

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Доп.точки доступа:
Orlov, Yu.S.; Орлов, Юрий Сергеевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Овчинников, Сергей Геннадьевич; Moscow International Symposium on Magnetism(5 ; 2011 ; Aug. ; 21-25 ; Moscow)
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Crystal structure and electronic states of Co and Gd ions in a Gd0.4Sr0.6CoO2.85 single crystal / M. S. Platunov [et al.] // JETP Letters. - 2016. - Vol. 103, Is. 3. - P. 196-200, DOI 10.1134/S0021364016030139. - Cited References:20. - This work was supported in part by the Russian Foundation for Basic Research (project nos. 13-02-00958, 13-02-00358, 14-02-31051, and 16-32-60049), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. SP-938.2015.5), and by the program "UMNIK." The X-ray diffraction and thermochemical studies were supported by the Siberian Branch, Russian Academy of Sciences (project no. V.45.3.1). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
X-RAY-ABSORPTION
   PROFILE REFINEMENT
   PEROVSKITE
   CHARGE
   SPIN
Аннотация: X-ray diffraction and X-ray absorption near edge structure (XANES) spectra have been measured at the Со K-edge and Gd L3-edge in GdCoO3 and Gd0.4Sr0.6CoO2.85 cobaltites. The effect of Sr substitution on the crystal structure and electronic and magnetic states of Co3+ ions in a Gd0.4Sr0.6CoO2.85 single crystal has been analyzed. The XANES measurements at the Co K-edge have not showed a noticeable shift of the absorption edge with an increase in the concentration of Sr. This indicates that the effective valence of cobalt does not change. An increase in the intensity of absorption at the Gd L3-edge is due to an increase in the degree of hybridization of the Gd(5d) and O(2p) states. The effect of hole doping on the magnetic properties results in the appearance of the ferromagnetic component and in a significant increase in the magnetic moment.

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Публикация на русском языке Кристаллическая структура и электронные состояния ионов Co и Gd в монокристалле Gd0.4Sr0.6CoO2.85 [Текст] / М. С. Платунов [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2016. - Т. 103 Вып. 3-4. - С. 214-219

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660036, Russia.
Natl Res Ctr Kurchatov Inst, Pl Akad Kurchatova 1, Moscow 123182, Russia.
Natl Res Nucl Univ MEPhI, Kashirskoe Sh 31, Moscow 115409, Russia.

Доп.точки доступа:
Platunov, M. S.; Платунов, Михаил Сергеевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Kazak, N. V.; Казак, Наталья Валерьевна; Solovyov, L. A.; Соловьев, Леонид Александрович; Zubavichus, Y. V.; Veligzhanin, A. A.; Dorovatovskii, P. V.; Vereshchagin, S. N.; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research [13-02-00958, 13-02-00358, 14-02-31051, 16-32-60049]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [SP-938.2015.5]; program "UMNIK"; Siberian Branch, Russian Academy of Sciences [V.45.3.1]
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Val'kov, V. V.
Kinematic mechanism of the modulation of the spectral intensity in the spatially uniform system of Hubbard fermions / V. V. Val'kov, A. A. Golovnya, M. M. Korovushkin // JETP Letters. - 2011. - Vol. 94, Is. 3. - P. 197-201, DOI 10.1134/S0021364011150148. - Cited References: 21. - We are grateful to R.O. Zaitsev and N.M. Plakida for the constructive criticism and helpful discussions. This work was supported by the Presidium of the Russian Academy of Sciences (program "Quantum Physics of Condensed Matter"), the Russian Foundation for Basic Research (project no. 09-02-00127), the Ministry of Education and Science of the Russian Federation (federal program "Scientific and Pedagogical Personnel of Innovative Russia" for 2009-2013), and the Siberian Branch, the Russian Academy of Sciences (integration project no. 53). The work of A.A.G. and M.M.K. was also supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (grant no. MK-1300-2011.2) and by the Siberian Branch, Russian Academy of Sciences (Lavrent'ev Competition). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
SPIN SUSCEPTIBILITY
   ANTIFERROMAGNETS
   DYNAMICS
   CHARGE
   MODEL
Аннотация: Using the exact representation of the Green's function constructed in terms of the Hubbard operators, it has been shown that the kinematic interaction that induces the spin-fluctuation processes in the spatially uniform system of Hubbard fermions leads to significant variations in the spectral intensity A(k, omega) in the Brillouin zone. As a result, the modulation of A(k, omega) appears in the Fermi contour. The sign of the hopping integral within the first coordination sphere is determined by the contour section, where A(k, omega) decreases according to the angle-resolved photoemission spectroscopy data.

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Держатели документа:
[Val'kov, V. V.
Golovnya, A. A.
Korovushkin, M. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Val'kov, V. V.
Golovnya, A. A.
Korovushkin, M. M.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Golovnya, A. A.; Головня, Александр Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Вальков, Валерий Владимирович
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Electronic structure, magnetic properties, and mechanism of the insulator-metal transition in LaCoO3 taking into account strong electron correlations / S. G. Ovchinnikov [et al.] // J. Exp. Theor. Phys. - 2011. - Vol. 112, Is. 1. - P. 140-151, DOI 10.1134/S1063776110061159. - Cited References: 36. - This study was supported financially by the Siberian and Ural Branches of the Russian Academy of Sciences (Integration Project no. 40), Department of Physics of the Russian Academy of Sciences (Program 2.3), Russian Foundation for Basic Research (Project nos. 09-02-00171-a and 10-02-00251), and Noncommercial "Dynasty" Foundation. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
SPIN-STATE TRANSITION
CHARGE
Кл.слова (ненормированные):
Energy spectra -- Excited energy level -- Finite temperatures -- Gap state -- Gap widths -- High temperature -- High-temperature anomalies -- Insulator metal transition -- Pauli contribution -- Spin crossovers -- Strong electron correlations -- Temperature dependence -- Total magnetization -- Cobalt compounds -- Density functional theory -- Electron correlations -- Electron density measurement -- Electronic properties -- Electronic structure -- Magnetic susceptibility -- Semiconductor insulator boundaries -- Spectroscopy -- Metal insulator transition
Аннотация: The electronic structure of LaCoO3 at finite temperatures is calculated using the LDA+GTB method taking into account strong electron correlations and possible spin crossover upon an increase in temperature. Gap states revealed in the energy spectrum of LaCoO3 reduce the dielectric gap width upon heating; this allowed us to describe the insulator-metal transition observed in this compound at T = 500-600 K. The temperature dependence of the magnetic susceptibility with a peak at T a parts per thousand 100 K is explained by the Curie contribution from thermally excited energy levels of the Co3+ ion. At high temperatures, the Pauli contribution from a band electron is added and the total magnetization of LaCoO3 is considered as the sum M (tot) = M (loc) + M (band). The second term describes the band contribution appearing as a result of the insulator-metal transition and facilitating the emergence of a high-temperature anomaly in the magnetic susceptibility of LaCoO3.

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Публикация на русском языке Электронная структура, магнитные свойства и механизм перехода диэлектрик-металл в LaCoO[3] с учетом сильных электронных корреляций [Текст] / С. Г. Овчинников [и др.] // Журнал экспериментальной и теоретической физики. - 2011. - Т. 139 Вып. 1. - С. 162-174

Держатели документа:
[Ovchinnikov, S. G.
Orlov, Yu S.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Ovchinnikov, S. G.] Siberian Aerosp Univ, Krasnoyarsk 660014, Russia
[Nekrasov, I. A.] Russian Acad Sci, Ural Div, Inst Electrophys, Ekaterinburg 620016, Russia
[Pchelkina, Z. V.] Russian Acad Sci, Ural Div, Inst Met Phys, Ekaterinburg 620990, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Siberian Aerospace University, Krasnoyarsk 660014, Russian Federation
Institute of Electrophysics, Ural Division, Russian Academy of Sciences, Yekaterinburg 620016, Russian Federation
Institute of Metal Physics, Ural Division, Russian Academy of Sciences, Yekaterinburg 620990, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Orlov, Y. S.; Nekrasov, I. A.; Pchelkina, Z. V.
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Orlov, Y. S.
Construction of a Multielectron Basis for Mott Insulators with Strong Electron Correlations, Spin-Orbit Interaction, and Covalence / Y. S. Orlov, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 2. - P. 322-338, DOI 10.1134/S1063776109080196. - Cited References: 35 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
NARROW ENERGY BANDS
   MAGNETIC ANISOTROPY ENERGY
   ORIGIN
   TRANSITION
   PHYSICS
   MANGANITES
   OXIDES
   CHARGE
Аннотация: We propose that the apparatus of quantum mechanics of a free atom (in particular, the theory of nj symbols and Rakah-Wigner genealogic coefficients generalized to the case of point groups and widely used in crystal field theory) be used for constructing multielectron bases with allowance for covalence and spin-orbit interaction. This allows us to take into account the electron-electron interaction for 3d ions the most comprehensively. The basis constructed in this way can be used in the generalized strong coupling method for the multiband p-d model in describing the structure of the quasiparticle energy spectrum and physical properties of systems with strong electron correlations. The procedure of construction and computation is demonstrated for the (5)T(2g) term in the d(6) configuration of the transition metal atom in an octahedral field. The mechanism for the emergence of magnetic anisotropy in S ions (Fe(3+) and Mn(2+)) due to covalent mixing of d(6) (L) under bar configurations with a nonzero orbital angular momentum ((L) under bar is a hole in ligands) is demonstrated

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Публикация на русском языке Орлов, Юрий Сергеевич. Построение многоэлектронного базиса для моттовских диэлектриков с учетом сильных электронных корреляций, спин-орбитального взаимодействия и ковалентности [Текст] / Ю. С. Орлов, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 2009. - Т. 136 Вып. 2. - С. 377-392

Держатели документа:
[Orlov, Yu S.
Ovchinnikov, S. G.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Dzebisashvili, D. M.
London Penetration Depth as a Test of Order Parameter Symmetry in Sodium Cobaltate Superconductors / D. M. Dzebisashvili, A. B. Klyuchantsev // Symmetry-Basel. - 2019. - Vol. 11, Is. 5. - Ст. 633, DOI 10.3390/sym11050633. - Cited References: 43. - The work was financially supported by the Russian Foundation for Basic Research (RFBR) (project no. 18-02-00837) and by the program of the Presidium of the Russian Academy of Sciences No. 12 "Fundamental problems of high-temperature superconductivity". . - ISSN 2073-8994

РУБ Multidisciplinary Sciences
Рубрики:
SPIN
   DEPENDENCE
   POWDER
   CHARGE
   PHASE
   GAP
Кл.слова (ненормированные):
chiral order parameter -- London penetration depth -- sodium cobaltate superconductor
Аннотация: Temperature dependence of the magnetic field penetration depth λ was calculated for water intercalated sodium cobaltate superconductor NaxCoO2⋅yH2O. Assuming that the system is in the chiral d+id–wave superconducting state, it was shown that the shifting of the excitation spectrum nodal points off the normal phase Fermi surface due to variation of the sodium content x changes the functional form of the temperature dependence of λ−2 from exponential to linear in the low temperatures region. It is argued that this change in the functional form of T–dependence of the λ−2 can serve as a proof for the chiral symmetry of the superconducting order parameter in the sodium cobaltate.

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

Доп.точки доступа:
Klyuchantsev, Andrey B.; Дзебисашвили, Дмитрий Михайлович; Russian Foundation for Basic Research (RFBR) [18-02-00837]; Presidium of the Russian Academy of Sciences [12]
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