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Fransson, J.
A perfect spin-filter quantum dot system / J. . Fransson, I. . Sandalov, O. . Eriksson // J. Phys.: Condens. Matter. - 2004. - Vol. 16, Is. 16. - P. L249-L254, DOI 10.1088/0953-8984/16/16/L03. - Cited References: 39 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
NARROW ENERGY BANDS
   ELECTRON CORRELATIONS
   MAGNETIC-FIELD
   MAGNETOTRANSPORT
   CONDUCTANCE
   RESISTANCE
   BARRIER
   FORMULA
   VALVE
   LIMIT
Кл.слова (ненормированные):
Electric potential -- Electron tunneling -- Magnetic couplings -- Magnetic fields -- Magnetic filters -- Transport properties -- Electron correlations -- Magnetic contacts -- Source-drain voltage -- Spin projections -- Semiconductor quantum dots
Аннотация: The discovery of a novel effect in the transport through a QD spin-dependently coupled to magnetic contacts is reported. For a finite range of source-drain voltages the spin projections of the current cancel exactly, resulting in a completely suppressed output current. The spin down current behaves as one normally expects whereas the spin up current becomes negative. As the source-drain voltage is increased the spin up current eventually becomes positive. Thus, tuning the source-drain voltage such that the spin up current vanishes will result in a perfect spin filter.

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Держатели документа:
Royal Inst Technol, Dept Phys, KTH, SE-10691 Stockholm, Sweden
Univ Uppsala, Dept Phys, SE-75121 Uppsala, Sweden
RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Max Planck Inst Phys Complex Syst, D-01187 Dresden, Germany
ИФ СО РАН
Department of Physics, Royal Institute of Technology (KTH), SE-106 91 Stockholm, Sweden
Physics Department, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden
Kirensky Institute of Physics, RAS, 660036 Krasnoyarsk, Russian Federation
Max-Plank-Inst. Phys. Complex Sys., Nothnitzer Stra?e 38, 01187 Dresden, Germany
Dept. of Mat. Sci. and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden

Доп.точки доступа:
Sandalov, I.; Eriksson, O.
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Nikolaev, S. V.
Anomalous spectral properties of high-Tc cuprates: influence of short-range correlations / S. V. Nikolaev, V. I. Kuz'min, S. G. Ovchinnikov // International school/workshop on actual problems of condensed matter physics : Program. Book of abstracts / ed. S. G. Ovchinnikov. - Norilsk, 2018. - P. 21 . - ISBN 978-5-904603-08-3

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Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Ovchinnikov, S. G.; Николаев, Сергей Викторович; Federal Research Center KSC SB RAS; Kirensky Institute of Physics; Research Institute of Agriculture and Ecology of the Arctic; Siberian Federal Univercity
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Krinitsyn, A.
Cluster size and shape effect on the electronic structure of the Hubbard model within the norm-conserving cluster perturbation theory / A. Krinitsyn, S. Nikolaev, S. G. Ovchinnikov // J. Supercond. Nov. Magn. - 2014. - Vol. 27, Is. 4. - P. 955-963, DOI 10.1007/s10948-013-2418-7. - Cited References: 59. - This work was supported by Grants NSh-1044.2012.2 and MK-1168.2012.2, Siberian Federal University: Grant F-11, and the Presidium of RAS Program 20.7. . - ISSN 1557-1939. - ISSN 1557-1947

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
NARROW ENERGY-BANDS
   CUPRATE SUPERCONDUCTORS
   PHOTOEMISSION SPECTRA
   PSEUDOGAP
   ANTIFERROMAGNET
   EXCITATIONS
   EVOLUTION
   SYSTEMS
   PHASE
   STATE
Кл.слова (ненормированные):
Cluster perturbation theory -- Hubbard model -- Strong correlations -- Density of states -- Fermi surface
Аннотация: Within a new norm-conserving approach to the cluster perturbation theory (CPT) for the 2d Hubbard model we study the effect of the cluster size and shape on the electronic structure. We have compared two type of clusters, 4-cluster (2x2) and 5-cluster (cruciform of 5 atoms). With 4-cluster we can treat exactly the first and second neighbours correlations, C (1) and C (2). With 5-cluster the third neighbour correlations C (3) are also treated exactly. The band structure in the CPT with 4- and 5-clusters differs remarkably. The quasiparticle spectral weight map for 5-clusters is very similar to the Quantum Monte Carlo (QMC) and the variational CPT data. With increasing doping, small hole Fermi surface transforms into conventional Fermi-liquid type large Fermi surface through Lifshitz quantum phase transitions.

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Держатели документа:
Dostoyevsky Omsk State Univ, Omsk 644077, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Nikolaev, S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Siberian Federal University [F-11]; Presidium of RAS Program [20.7]; [NSh-1044.2012.2]; [MK-1168.2012.2]
}
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Co-Zn nanoferrites for high frequency applications: correlations between dielectric and magnetic properties / A. Thakur, I. S. Edelman, S. G. Ovchinnikov [et al.] // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect. : Spintronics and magnetic nanostructures. - Ст. A.O5. - P. 37-38. - Cited References: 2 . - ISBN 978-5-94469-051-7

Материалы симпозиума, ,
Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Centre for Nanotechnology, Amity University Haryana, India
Department of Physics, Amity School of Applied Sciences, Amity University Haryana, India

Доп.точки доступа:
Ovchinnikov, S. G. \program com.\; Овчинников, Сергей Геннадьевич; Thakur, A.; Edelman, I. S.; Эдельман, Ирина Самсоновна; Ovchinnikov, S. G.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Petrov, D. A.; Петров, Дмитрий Анатольевич; Thakur, P.; Российская академия наук; Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Euro-Asian Symposium "Trends in MAGnetism"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
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Gorban, A.
Codon usage trajectories and 7-cluster structure of 143 complete bacterial genornic sequences / A. . Gorban, T. . Popova, A. . Zinovyev // Physica A. - 2005. - Vol. 353. - P. 365-387, DOI 10.1016/j.physa.2005.01.043. - Cited References: 46 . - ISSN 0378-4371

РУБ Physics, Multidisciplinary
Рубрики:
DNA-BASE COMPOSITION
   ASYMMETRIC SUBSTITUTION PATTERNS
   PROTEIN-CODING REGIONS
   MICROBIAL GENOMES
   GENE IDENTIFICATION
   MARKOV-MODELS
   G+C CONTENT
   BIAS
   PREDICTION
   SELECTION
Кл.слова (ненормированные):
genome -- cluster -- codon usage -- correlations -- entropy -- mean field -- Cluster -- Codon usage -- Correlations -- Entropy -- Genome -- Mean field -- Approximation theory -- Correlation methods -- Database systems -- Entropy -- Functions -- Genes -- Mathematical models -- Clusters -- Codon usage -- Genomes -- Mean field -- Bacteria
Аннотация: Three results are presented. First, we prove the existence of a universal 7-cluster structure in all 143 completely sequenced bacterial genomes available in Genbank in August 2004, and explained its properties. The 7-cluster structure is responsible for the main part of sequence heterogeneity in bacterial genomes. In this sense, our 7 clusters is the basic model of bacterial genome sequence. We demonstrated that there are four basic "pure" types of this model, observed in nature: "parallel triangles", "perpendicular triangles", degenerated case and the flower-like type. Second, we answered the question: how big are the position-specific information and the contribution connected with correlations between nucleotide. The accuracy of the mean-field (context-free) approximation is estimated for bacterial genomes. We show that codon us-age of bacterial genomes is a multi-linear function of their genomic G+C-content with high accuracy (more precisely, by two similar functions, one for eubacterial genomes and the other one for archaea). Description of these two codon-usage trajectories is the third result. All 143 cluster animated 3D-scatters are collected in a database and is made available on our web-site: http://www.ihes.fr/similar to zinovyev/7clusters. (c) 2005 Elsevier B.V. All rights reserved.

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Держатели документа:
Univ Leicester, Dept Math, Leicester LE1 7RH, Leics, England
RAS, SB, Inst Computat Modelling, Krasnoyarsk, Russia
Bures Sur Yvette & Bioinformat Serv Inst Curie, Inst Hautes Etudes Sci, Paris, France
ИВМ СО РАН
Department of Mathematics, University of Leicester, Leicester, University Road, Leicester LE1 7RH, United Kingdom
Institute of Computational Modelling, SB RAS, Krasnoyarsk, Russian Federation
Institut des Hautes Etudes Scientifiques, Bures-sur-Yvette and Bioinformatics Service of Institut Curie, Paris, France

Доп.точки доступа:
Popova, T.; Zinovyev, A.
}
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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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Kagan, M. Yu..
Coulomb interactions-induced perfect spin-filtering effect in a quadruple quantum-dot cell / M. Y. Kagan, V. V. Val'kov, S. V. Aksenov // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 15-18, DOI 10.1016/j.jmmm.2016.12.106. - Cited References:29. - We acknowledge fruitful discussions with P.I. Arseyev, N.S. Maslova, V.N. Mantsevich and R.Sh. Ikhsanov. This work was supported by the Comprehensive programme SB RAS no. 0358-2015-0007, the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects nos. 15-02-03082, 16-42-243056, 16-42-242036, 17-42-240441. M.Yu.K. thanks the Program of Basic Research of the National Research University Higher School of Economics for support. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPINTRONICS
TRANSPORT
MODEL
Кл.слова (ненормированные):
Spin filter -- Quantum interference -- Fano-Feshbach resonance -- Coulomb -- correlations
Аннотация: A quadruple quantum-dot (QQD) cell is proposed as a spin filter. The transport properties of the QQD cell were studied in linear response regime on the basis of the equations of motion for retarded Green's functions. The developed approach allowed us to take into account the influence of both intra-and interdot Coulomb interactions on charge carriers' spin polarization. It was shown that the presence of the insulating bands in the conductance due to the Coulomb correlations results in the emergence of spin-polarized windows (SPWs) in magnetic field leading to the high spin polarization. We demonstrated that the SPWs can be effectively manipulated by gate fields and considering the hopping between central dots in both isotropic and anisotropic regimes.

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Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Aksenov, S. V.; Аксенов, Сергей Владимирович; 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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Crystal field parameters and magnetic properties correlations in rare-earth orthoferrite HoFeO3 / O. V. Usmanov, A. K. Ovsianikov, I. A. Zobkalo [et al.] // J. Surf. Invest. - 2022. - Vol. 16, Is. 6. - P. 1041-1047, DOI 10.1134/S1027451022060258. - Cited References: 28. - This work was supported by the Russian Foundation for Basic Research grant no. 19-52-12 047, and DFG grant no. SA 3688/1-1 . - ISSN 1027-4510. - ISSN 1819-7094
Кл.слова (ненормированные):
orthoferrites -- X-ray powder diffraction -- crystal electric field parameters -- holmium orthoferrite -- magnetization temperature evolution -- CEF
Аннотация: The crystal structure and magnetic properties investigations of holmium orthoferrite compound HoFeO3 were performed in temperature range 7–300 K. Obtained XRD data confirm that HoFeO3 retains the orthorhombic perovskite structure of Pbnm space group. The crystal electric field (CEF) parameters of Ho3+ ion subsystem has been revealed numerically on the base of point charge model in the same temperature range. By this set of parameters CEF the splitting of Ho3+ energy levels was calculated and their temperature evolution was obtained. Modelling of isothermal magnetization M(H) with obtained set of parameters was carried out. Ho3+ single ion anisotropy due to CEF effects was demonstrated. Bulk magnetization evaluated from CEF was compared to experimental data.

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Держатели документа:
Petersburg Nuclear Physics Institute by B.P. Konstantinov of NRC “Kurchatov Institute,”, Gatchina, 188300, Russian Federation
Institute of Crystallography, RWTH Aachen University, Aachen, 52066, Germany
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660071, Russian Federation

Доп.точки доступа:
Usmanov, O. V.; Ovsianikov, A. K.; Zobkalo, I. A.; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Terentjev, K. Yu.; Терентьев, Константин Юрьевич; Semenov, S. V.; Семёнов, Сергей Васильевич
}
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Val'kov, V. V.
d-Wave pairing in an ensemble of spin polaron quasiparticles in the spin-fermion model of the electronic structure of the CuO2 plane / V. V. Val'kov, D. M. Dzebisashvili, A. F. Barabanov // Phys. Lett. A. - 2015. - Vol. 379, Is. 5. - P. 421-426, DOI 10.1016/j.physleta.2014.11.036. - Cited References:26. - This study was supported by the Russian Foundation for Basic Research,projects Nos. 13-02-00523, 13-02-00909 and 13-02-98013 (Siberia) and theDynasty Foundation. . - ISSN 0375. - ISSN 1873-2429. -

РУБ Physics, Multidisciplinary
Рубрики:
SUPERCONDUCTIVITY
ANTIFERROMAGNETISM
Кл.слова (ненормированные):
Hight-temperature cuprate superconductors -- Tree-band p-d model -- Spin -- polaron -- Strong electron correlations
Аннотация: It is demonstrated for the first time that the strong coupling between spin moments of copper ions and oxygen holes, which arises upon hybridization mixing of two hole subsystems in the Emery model, not only affects the formation of spin polaron quasiparticles but also ensures effective attraction between them via the exchange interaction. This results in the Cooper instability with d-wave pairing in a 2D ensemble of spin polaron quasiparticles. The T-x phase diagram obtained using this approach agrees well with the available experimental data. (C) 2014 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, LV Kirensky Inst Phys, SB, Krasnoyarsk 660036, Russia.
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.
Inst High Pressure Phys, Troitsk 142098, Moscow Region, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович; Dynasty Foundation; Russian Foundation for Basic Research (Siberia) [13-02-00523,13-02-00909, 13-02-98013]
}
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10.

Makarov, I. A.
Dependence of the critical temperature of high-temperature cuprate superconductors on hoppings and spin correlations between CuO2 planes / I. A. Makarov, S. G. Ovchinnikov, E. I. Shneider // J. Exp. Theor. Phys. - 2012. - Vol. 114, Is. 2. - P. 329-342, DOI 10.1134/S1063776112020264. - Cited References: 73. - This study was supported in part by the Presidium of the Russian Academy of Sciences (program "Quantum Physics of Condensed Media," project no. 18.7), jointly by the Siberian and Ural branches of the Russian Academy of Sciences (integration projects project no. 40), the Russian Foundation for Basic Research (project no. 09-02-00127), the Presidential Program in Support of Young Scientists in Russia (project no. MK-1683.2010.2), and the federal target program "Specialists" (project no. P891). One of the authors (E.I.Sh.) gratefully acknowledges support from the nonprofit Dynasty foundation. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   BAND HUBBARD-MODEL
   SINGLE-CRYSTALS
   TRANSITION-TEMPERATURE
   FERMI-SURFACE
   DOPING DEPENDENCE
   THERMAL-EXPANSION
   COPPER OXIDES
   ANISOTROPY
   LA2-XSRXCUO4
Аннотация: The influence of interlayer hoppings on the superconducting transition temperature (T c) in bilayer cuprates has been studied. The parameter of hopping between layers is expressed as t ⊥(k) = t ⊥(cos(k x ) − cos(k y ))2 and treated as a small perturbation for the states of two CuO2 planes described by the t-t′-t″-J* model. In the generalized mean field approximation for dx2−y2{d_{{x. } - {y. }}} symmetry of the superconducting gap, neither the interlayer hopping or exchange interaction, nor the pair hopping between CuO2 layers provides an additional mechanism of Cooper pair formation or an increase in T c. In the concentration dependence of T c, the bilayer splitting of the upper Hubbard band of quasi-holes is manifested as two peaks with temperatures slightly lower than the maximum T c for a single-layer cuprate. Interlayer antiferromagnetic spin correlations suppress bilayer splitting.

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Публикация на русском языке Макаров, Илья Анатольевич. Зависимость критической температуры высокотемпературных сверхпроводников от перескоков и спиновых корреляций между CuO2-плоскостями [Текст] / И. А. Макаров, С. Г. Овчинников, Е. И. Шнейдер // Журн. эксперим. и теор. физ. : Наука, 2012. - Т. 141 Вып. 2. - С. 372-386

Держатели документа:
[Makarov, I. A.
Ovchinnikov, S. G.
Shneider, E. I.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Makarov, I. A.
Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneider, E. I.] Reshetnikov Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneider, E. I.; Шнейдер, Елена Игоревна; Макаров, Илья Анатольевич
}
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11.

Dependence of the critical temperature of high-temperature superconductors on the hoppings and spin correlations between Cu02-planes / I. A. Makarov, S. G. Ovchinnikov, E. I. Shneyder // Strongly Correlated Electronic Systems 2011 (SCES 2011) : Proceeding. - 2011

Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; "Strongly Correlated Electronic Systems", Conf.(2011 ; 29th Aug. 3rd September ; Cambridge, UK)
}
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12.

Ignatchenko, V. A.
Development of a self-consistent approximation / V. A. Ignatchenko, D. S. Polukhin // J. Phys. A. - 2016. - Vol. 49, Is. 9. - Ст. 095004, DOI 10.1088/1751-8113/49/9/095004. - Cited References: 43 . - ISSN 1751-8113

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
SUPERCONDUCTING CRITICAL-TEMPERATURE
   LATTICE-VIBRATIONS
   VERTEX FUNCTION
   ELECTRON
Кл.слова (ненормированные):
self-consistent approximation -- Green's functions -- vertex corrections -- inhomogeneities -- correlations -- dynamic susceptibility
Аннотация: A self-consistent approximation of a higher level than the standard self-consistent approximation, known in various fields of physics as the Migdal, Kraichnan or Born self-consistent approximation, is derived taking into account both the first and second terms of the series for the vertex function. In contrast to the standard approximation, the new self-consistent approximation is described by a system of two coupled nonlinear integral equations for the self-energy and the vertex function. In addition to all the diagrams with non-intersecting lines of correlation/interaction taken into account by the standard self-consistent approximation, the new approach takes into account in each term of the Green's function expansion a significant number of diagrams with intersections of these lines. Because of this, the shape, linewidth, and amplitude of the resonance peaks of the dynamic susceptibility calculated in this approximation are much closer to the exact values of these characteristics. The advantage of the new self-consistent approach is demonstrated by the example of calculation of the dynamic susceptibility of waves in an inhomogeneous medium. © 2016 IOP Publishing Ltd.

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Доп.точки доступа:
Polukhin, D. S.; Полухин, Дмитрий Сергеевич; Игнатченко, Вальтер Алексеевич
}
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13.

Diagram Approach to the Problem of the Normal Phase Properties of the Spin-Polaron Ensemble in Cuprate Superconductors / V. V. Val'kov [et al.] // J. Low Temp. Phys. - 2019. - Vol. 197, Is. 1-2. - P. 34-43, DOI 10.1007/s10909-019-02211-9. - Cited References: 29. - The work was supported by the program of the Presidium of the Russian Academy of Sciences No. 12 “Fundamental problems of high-temperature superconductivity,” the Russian Foundation for Basic Research (RFBR) (Projects Nos. 18-02-00837 and 19-02-00509) and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (Projects Nos. 18-42-243002 “Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors,” 18-42-243018 “Contact phenomena and magnetic disorder in the problem of the formation and detection of topological edge states in semiconductor nanostructures,” and 18-42-240014 “Single-orbit effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors”). . - ISSN 0022-2291
Кл.слова (ненормированные):
Cuprate superconductors -- Unconventional superconductivity -- Spin-charge correlations
Аннотация: Taking into account the real crystalline structure of the CuO 2 plane within the spin-fermion model and using the diagram technique, the spin-polaron concept of the fermionic excitations in cuprate superconductors is implemented. It is shown that an account of the on-site scattering processes leads to considerable binding energy of the spin-polaron quasiparticles. An account of the two-site spin-fermion scattering processes results in the energy spectrum and spectral properties of the spin-polaron quasiparticles which agree well with experimental data on cuprate superconductors.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation
Vereshchagin Institute for High Pressure Physics, Troitsk, Moscow, 108840, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.
}
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14.

Dominance of many-body effects over the one-electron mechanism for band structure doping dependence in Nd2-xCexCuO4: the LDA + GTB approach / M. M. Korshunov [et al.] // J. Phys.: Condens. Matter. - 2007. - Vol. 19, Is. 48. - Ст. 486203, DOI 10.1088/0953-8984/19/48/486203. - Cited References: 36 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
NARROW ENERGY BANDS
   HUBBARD-MODEL
   SUPERCONDUCTORS
   DENSITY
   TEMPERATURE
   ORBITALS
   WAVE
Кл.слова (ненормированные):
Antiferromagnetism -- Band structure -- Correlation methods -- Crystal structure -- Local density approximation -- Superconducting materials -- Electronic correlations -- Fermionic quasiparticles -- Neodymium compounds
Аннотация: In the present work we report band structure calculations for the high-temperature superconductor Nd2-xCexCuO4 in the regime of strong electronic correlations within an LDA + GTB method, which combines the local density approximation (LDA) and the generalized tight-binding method (GTB). The two mechanisms of band structure doping dependence were taken into account. Namely, the one-electron mechanism provided by the doping dependence of the crystal structure, and the many-body mechanism provided by the strong renormalization of the fermionic quasiparticles due to the large on-site Coulomb repulsion. We have shown that, in the antiferromagnetic and in the strongly correlated paramagnetic phases of the underdoped cuprates, the main contribution to the doping evolution of the band structure and Fermi surface comes from the many-body mechanism.

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Держатели документа:
[Korshunov, M. M.
Gavrichkov, V. A.
Ovchinnikov, S. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, R-660036 Krasnoyarsk, Russia
[Korshunov, M. M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Nekrasov, I. A.
Kokorina, E. E.] Russian Acad Sci, Inst Electrophys, R-620016 Ekaterinburg, Russia
[Pchelkina, Z. V.] Russian Acad Sci, Inst Met Phys, Ural Div, R-620041 Ekaterinburg, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
Institute of Electrophysics, Russian Academy of Sciences, Ural Division, Amundsena 106, 620016 Yekaterinburg, Russian Federation
Institute of Metal Physics, Russian Academy of Sciences-Ural Division, GSP-170, 620041 Yekaterinburg, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Nekrasov, I. A.; Kokorina, E. E.; Pchelkina, Z. V.
}
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15.

Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model / V. I. Kuz'min, M. A. Visotin, S. V. Nikolaev, S. G. Ovchinnikov // Phys. Rev. B. - 2020. - Vol. 101, Is. 11. - Ст. 115141, DOI 10.1103/PhysRevB.101.115141. - Cited References: 97. - The reported study was funded by RFBR according to Research Project No. 18-32-00256 (all the results concerning the influence of short-range correlations on the electronic spectral properties). The reported study was also funded by RFBR according to Research Project No. 18-32-01062; the Russian Foundation for Basic Research and Government of Krasnoyarsk Territory, the Krasnoyarsk Regional Fund of Science to the Research Projects "Electronic correlation effects and multiorbital physics in iron-based materials and cuprates" No. 19-42-240007 and "Features of electron-phonon coupling in high-temperature superconductors with strong electron correlations" No. 18-42-240017. . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
QUASI-PARTICLE DISPERSION
   FERMI-SURFACE
   QUANTUM OSCILLATIONS
   LANCZOS METHOD
Аннотация: Cluster perturbation theory is applied to the two-dimensional Hubbard t - t' - t '' - U model to obtain doping and temperature-dependent electronic spectral function with 4 x 4 and 12-site clusters. It is shown that evolution of the pseudogap and electronic dispersion with doping and temperature is similar and in both cases it is significantly influenced by spin-spin short-range correlations. When short-range magnetic order is weakened by doping or temperature and Hubbard-I-like electronic dispersion becomes more pronounced, the Fermi arc turns into a large Fermi surface and the pseudogap closes. It is demonstrated how static spin correlations impact the overall dispersion's shape and how accounting for dynamic contributions leads to momentum-dependent spectral weight at the Fermi surface and broadening effects.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Visotin, M. A.; Высотин, Максим Александрович; Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; RFBRRussian Foundation for Basic Research (RFBR) [18-32-00256, 18-32-01062]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [19-42-240007, 18-42-240017]
}
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16.

Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model [Preprint] / V. I. Kuz'min, M. A. Visotin, S. V. Nikolaev, S. G. Ovchinnikov. - Electronic text data // ArXiv. - 2020. - Ст. 2001.05143. - Cited References: 86. - The reported study was funded by RFBR according to the research project No. 18-32-00256 (all the results concerning the influence of short-range correlations on the electronic spectral properties). The reported study was also funded by Russian Foundation for Basic Research and Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects “Electronic correlation effects and multiorbital physics in iron-based materials and cuprates” number 19-42-240007, and “Features of electron-phonon coupling in high-temperature superconductors with strong electron correlations” number 18-42-240017
Рубрики:
Strongly Correlated Electrons
Аннотация: Cluster perturbation theory is applied to the two-dimensional Hubbard t−t′−t′′−U model to obtain doping and temperature dependent electronic spectral function with 4×4 and 12-site clusters. It is shown that evolution of the pseudogap and electronic dispersion with doping and temperature is similar and in both cases it is significantly influenced by spin-spin short-range correlations. When short-range magnetic order is weakened by doping or temperature and Hubbard-I like electronic dispersion becomes more pronounced, the Fermi arc turns into large Fermi surface and the pseudogap closes. It is demonstrated how static spin correlations impact the overall dispersion's shape and how accounting for dynamic contributions leads to momentum-dependent spectral weight at the Fermi surface and broadening effects.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036 Russia
Siberian Federal University, Krasnoyarsk, 660041 Russia

Доп.точки доступа:
Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Visotin, M. A.; Высотин, Максим Александрович; Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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17.

    Makarov, I. A.
    Doping dependence of the electronic structure of polaronic excitations in the HTSC cuprates / I. A. Makarov, S. G. Ovchinnikov // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P2.9. - P. 151. - References: 1. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support . - ISBN 978-5-904603-06-9
   Перевод заглавия: Концентрационная зависимость электронной структуры поляронных возбуждений в ВТСП купратах
Кл.слова (ненормированные):
cuprates -- strong electron correlations -- electron-phonon interaction -- polaron

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич; 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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18.

Gavrichkov, V. A.
Doping dependent electronic structure of cuprates and the effective low energy Hamiltonian for the magnetic pairing / V. A. Gavrichkov, M. M. Korshunov, S. G. Ovchinnikov // Int. J. Mod. Phys. B. - 2005. - Vol. 19, Is. 1-3. - P. 247-249, DOI 10.1142/S0217979205028335. - Cited References: 14 . - ISSN 0217-9792

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
COPPER OXIDES
SYMMETRY
MODEL
Кл.слова (ненормированные):
electronic structure -- strong electron correlations -- magnetic mechanism of pairing -- Electronic structure -- Magnetic mechanism of pairing -- Strong electron correlations -- copper derivative -- calculation -- chemical reaction -- chemical structure -- conference paper -- correlation analysis -- electron -- electronics -- energy -- hybridization -- intermethod comparison -- magnetism -- mathematical analysis -- mathematical model
Аннотация: The properties of the normal and superconducting phases of p- and n-type cuprates are investigated in the appropriate low-energy models in the approximation beyond Hubbard I considering spin fluctuations. Calculated chemical potential dependence on doping, Fermi surface and T,(x) phase diagram for n-type cuprates are in remarkably good agreement with the experimental ones. Comparison of the singlet-triplet t-J model with simple t-J model shows that the spin-exciton mechanism originated from singlet-triplet hybridization leads to small contribution to the T-c(x) - optimal doping value becomes slightly lower and the maximum value of T-c become slightly higher.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirensky Inst. Phys. S., Russian Academy of Science, Akademgorodok, 660036, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович; International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials(5 ; 2004 ; June ; 11-16 ; Chongqing, China)
}
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19.

Korshunov, M. M.
Doping-dependent evolution of low-energy excitations and quantum phase transitions within an effective model for high-T-c copper oxides / M. M. Korshunov, S. G. Ovchinnikov // Eur. Phys. J. B. - 2007. - Vol. 57, Is. 3. - P. 271-278, DOI 10.1140/epjb/e2007-00179-2. - Cited References: 49 . - ISSN 1434-6028

РУБ Physics, Condensed Matter
Рубрики:
ELECTRON CORRELATIONS
   HUBBARD-MODEL
   RANGE-ORDER
   DIMENSIONS
   WAVE
   FERMIONS
   SYSTEMS
   BANDS
   METAL
Кл.слова (ненормированные):
Doping dependent evolution -- Kinematic correlation functions -- Low energy excitations -- Quantum phase transitions -- Doping (additives) -- Electric excitation -- Mean field theory -- Parameter estimation -- Phase transitions -- Quantum theory -- Copper oxides
Аннотация: In this paper a mean-field theory for the spin-liquid paramagnetic non-superconducting phase of the p- and n-type high-T-c cuprates is developed. This theory applied to the effective t-t'-t ''-J* model with the ab initio calculated parameters and with the three-site correlated hoppings. The static spin-spin and kinematic correlation functions beyond Hubbard-I approximation are calculated self-consistently. The evolution of the Fermi surface and band dispersion is obtained for the wide range of doping concentrations x. For p-type systems the three different types of behavior are found and the transitions between these types are accompanied by the changes in the Fermi surface topology. Thus a quantum phase transitions take place at x = 0.15 and at x = 0.23.Due to the different Fermi surface topology we found for n-type cuprates only one quantum critical concentration, x = 0.2. The calculated doping dependence of the nodal Fermi velocity and the effective mass are in good agreement with the experimental data.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Max-Planck-Institut fur Physik Komplexer Systeme, 01187 Dresden, Germany

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Коршунов, Максим Михайлович
}
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20.

Kuz'min, V. I.
Effect of canted antiferromagnetic order on the electronic structure in the t–J* model within the cluster perturbation theory / V. I. Kuz’min, S. V. Nikolaev, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2016. - Vol. 123, Is. 3. - P. 511-519, DOI 10.1134/S1063776116090065. - Cited References: 50. - We are grateful to V.V. Val’kov for stimulating discussions. This work was supported by the Russian Science Foundation (project no. 14-12-00061) . - ISSN 1063-7761
Кл.слова (ненормированные):
Antiferromagnetism -- Electronic structure -- High temperature superconductors -- Magnetic fields -- Antiferromagnetic orderings -- Cluster perturbation theories -- Electron-doping -- External fields -- External magnetic field -- Non-monotonic dependence -- Short-range correlations -- Spectral weight -- Perturbation techniques
Аннотация: The electronic structure in the two-dimensional t–J* model with canted antiferromagnetic order in an external magnetic field has been calculated within the cluster perturbation theory. In zero external field, the evolution of the Fermi surface with n-type doping has been obtained in good agreement with experimental data on cuprate superconductors. It has been shown that the inclusion of short-range correlations can result in a nonmonotonic dependence of the spectral weight distribution at the Fermi level on the external magnetic field. In contrast to the case of electron doping, such changes in the case of hole doping can be expected at experimentally achievable fields. © 2016, Pleiades Publishing, Inc.

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Публикация на русском языке Кузьмин, Валерий Ипполитович. Влияние скошенного антиферромагнитного порядка на электронную структуру в t-J*-модели в рамках кластерной теории возмущений [Текст] / В. И. Кузьмин, С. В. Николаев, С. Г. Овчинников // Журн. эксперим. и теор. физ. : Наука, 2016. - Т. 150 Вып. 3. - С. 592-601

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

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Кузьмин, Валерий Ипполитович
}
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