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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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Application of the new LDA plus GTB method for the band structure calculation of n-type cuprates / M. M. Korshunov [et al.] // Physica B. - 2006. - Vol. 378-80: International Conference on Strongly Correlated Electron Systems (SECES 05) (JUL 26-30, 2005, Vienna, AUSTRIA). - P. 459-460, DOI 10.1016/j.physb.2006.01.340. - Cited References: 11 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
SUPERCONDUCTIVITY
PARAMETERS
DENSITY
Кл.слова (ненормированные):
strongly correlated electron systems -- superconductivity -- n-type cuprates -- n-type cuprates -- Strongly correlated electron systems -- Superconductivity -- Electronic structure -- Hamiltonians -- Mathematical models -- Oxide superconductors -- Perturbation techniques -- Intercluster hopping -- N-type cuprates -- Strongly correlated electron systems -- Band structure
Аннотация: A novel hybrid scheme is proposed and applied for band structure calculations of undoped n-type cuprate Nd2CuO4. The ab initio LDA calculation is used to obtain single electron and Coulomb parameters of the multiband Hubbard-type model. In strong correlation regime the electronic structure within this model is calculated by the generalized tight-binding (GTB) method, that combines the exact diagonalization of the model Hamiltonian for a small cluster with perturbation treatment of the intercluster hopping and interactions. For Nd2CuO4, this scheme results in charge transfer insulator with value of the gap and band dispersion in agreement to the experimental data. (c) 2006 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Met Phys, Ural Div, Ekaterinburg 620219, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Institute of Metal Physics, Russian Academy, Sciences-Ural Division, GSP-170, 620219 Yekaterinburg, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Nekrasov, I. A.; Pchelkina, Z. V.; Anisimov, V. I.
}
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BCS-type Theory for the Sum of Magnetic and Phonon Coupling in high-Tc Cuprates / E. Shneyder, S. Ovchinnikov // 18th International Conference on Magnetism (ICM-2009). - 2009. - Ст. Mo-A-5.1-03

Доп.точки доступа:
Shneyder, E.; Ovchinnikov, S.; International Conference on Magnetism(18 ; 2009 ; July 26-31 ; Karlsruhe, Germany)
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Coexisting 1D and 3D magnetic interactions in the insulating copper-oxygen compound CuB2O4 / M. . Boehm [et al.] // Physica B. - 2006. - Vol. 378-80: International Conference on Strongly Correlated Electron Systems (SECES 05) (JUL 26-30, 2005, Vienna, AUSTRIA). - P. 1128-1129, DOI 10.1016/j.physb.2006.01.540. - Cited References: 8 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
SPIN-WAVE SPECTRUM
PHASE 10 K
METABORATE
Кл.слова (ненормированные):
cuprates -- magnetic soliton lattice -- Heisenberg exchange -- low-dimensional excitations -- Cuprates -- Heisenberg exchange -- Low-dimensional excitations -- Magnetic soliton lattice -- Dispersions -- Insulating materials -- Magnetic properties -- Neutron scattering -- Positive ions -- Cuprates -- Heisenberg exchange -- Low-dimensional excitations -- Magnetic soliton lattice -- Copper compounds
Аннотация: We performed inelastic neutron scattering measurements on CuB2O4 with a magnetic field applied in the tetragonal basal plane. The spin dynamics in this cuprate is determined by the interplay of two magnetic Cu2+ subsystems, the magnetic cage with predominant 3d Heisenberg exchange and quasi Id zig-zag chains. The comparison of the dispersion spectra along the chain direction in zero field and under applied field suggests a decoupling of the two magnetic sublattices under field. (c) 2006 Elsevier B.V. All rights reserved.

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Держатели документа:
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
Russian Acad Sci, Inst Phys, SB, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institut Laue Langevin, 6, rue Jules Horowitz, F-38042 Cedex 9, France
Laboratory of Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
Institute of Physics, SB RAS, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Boehm, M.; Roessli, B.; Schefer, J.; Ouladdiaf, B.; Kulda, J.; Petrakovskii, G. A.; Петраковский, Герман Антонович
}
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Ovchinnikov, S. G.
Comparison of electronic structure, magnetic mechanism, and symmetry of pairing in ruthenates and cuprates / S. G. Ovchinnikov ; ed. C Noce [et al.] // Ruthenate and rutheno-cuprate materials: unconventional superconductivity, magnetism and quantum phase transitions. Ser. lecture notes in physics : Springer Verlag, 2002. - Vol. 603: International Conference on Ruthenate and Rutheno-Cuprate Materials (OCT 25-27, 2001, VIETRI SUL MARE, ITALY). - P. 239-255. - Cited References: 48 . - ISBN 0075-8450. - ISBN 3-540-44275-8

РУБ Physics, Multidisciplinary + Physics, Condensed Matter
Рубрики:
METAL-INSULATOR-TRANSITION
   SUPERCONDUCTOR SR2RUO4
   LAYERED PEROVSKITE
   BAND-STRUCTURE
   CORRELATED ELECTRONS
   MOTT TRANSITION
   COPPER OXIDES
   HUBBARD-MODEL
   RUSR2GDCU2O8
   CA2-XSRXRUO4
Аннотация: A generalized tight-binding (GTB) method is developed to calculate quasi-particle band structure with explicit account for strong electronic correlations. The GTB method combines exact diagonalization of the multi-orbital P-d model Hamiltonian within the unit cell and the perturbation theory in the Hubbard X-operators form for the inter-cell hopping and interactions. For undoped cuprates we obtain the valence band structure in excellent agreement with ARPES data, evolution of the band structure with doping with an in-gap state at small doping, impurity-like band at higher doping to optimally doped metal. The effective low-energy Hamiltonian has the form of singlet-triplet t-J model. For ruthenates the t-J-I model is proposed with both antiferromagnetic J and ferromagnetic I couplings. In the strong correlation limit, the mean-field theory of superconductivity results in d-wave singlet pairing mediated by J (cuprates) and p-wave triplet one mediated by I (ruthenates) with ratio T-c((d))/T-c((p)) similar to 100 due to the different symmetry of the gap. The competition of ferromagnetic and antiferromagnetic order in rutheno-cuprates is also discussed.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Noce, C \ed.\; Vecchione, A \ed.\; Cuoco, M \ed.\; Cuoco, \ed.\; Овчинников, Сергей Геннадьевич
}
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    Crossover large polaron - small polaron in the HTSC cuprates / I. A. Makarov [и др.] // V Междунар. конф. "Фундамент. пробл. высокотемп. сверхпров-ти" (ФПС'2015) : сборник расширенных тезисов . - М. : ФИАН, 2015. - Библиогр.: 3 назв.
   Перевод заглавия: Кроссовер большой полярон - малый полярон в ВТСП купратах

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Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Kozlov, P. A.; Козлов, Пётр Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; "Фундаментальные проблемы высокотемпературной сверхпроводимости", Международная конференция(5 ; 2015 ; окт. ; 5-9 ; Малаховка, Моск. обл.); Российская академия наук ; Физический институт им. П.Н. Лебедева РАН; Научный совет по физике конденсированного состояния РАН; Научный совет по физике низких температур РАН
}
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Physics, Applied
C94

Cuprates, manganites and cobaltites: Multielectron approach to the band structure / M. M. Korshunov [et al.] // Mod. Phys. Lett. B. - 2012. - Vol. 26, Is. 24. - Ст. 1230016, DOI 10.1142/S0217984912300165. - Cited References: 93. - We are thankful to O. K. Andersen, V. I. Anisimov, A. F. Barabanov, K. I. Kikoin, N. M. Plakida, S. Sakai, A.-M.S. Tremblay, V. V. Val'kov, and R. O. Zaitsev for useful discussions. This work was supported by the Presisium of RAS program Quantum physics of condensed matter N 20.7, Grant "Leading scientific schools of Russia" (NSh 1044-2012.2), RFBR (Grant No. 09-02-00127), Integration Grant of SBRAS-UrBRAS N 44, Grant of President of Russia MK-1683.2010.2, FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK 16.740.12.0731 and GK 16.740.11.0740), and Siberian Federal University (Theme N F-11). M.M.K. and E.I.S. acknowledges support from The Dynasty Foundation and ICFPM. . - ISSN 0217-9849

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   MEAN-FIELD THEORY
   DENSITY-FUNCTIONAL FORMALISM
   CORRELATED ELECTRON-SYSTEMS
   TRANSITION-METAL COMPOUNDS
   SPIN-STATE TRANSITION
   T-J MODEL
   MAGNETIC-PROPERTIES
   COPPER OXIDES
   LaCoO3
Кл.слова (ненормированные):
LDA plus GTB method -- strongly-correlated systems -- band structure
Аннотация: High-T-c superconductors with CuO2 layers, manganites La1-xSrxMnO3 and cobaltites LaCoO3 present several mysteries in their physical properties. Most of them are believed to come from the strongly-correlated nature of these materials. From the theoretical viewpoint, there are many hidden rocks in making the consistent description of the band structure and low-energy physics starting from the Fermi-liquid approach. Here, we discuss the alternative method - multielectron approach to the electronic structure calculations for the Mott insulators - called LDA + GTB (local density approximation + generalized tight-binding) method. Its origin is a straightforward generalization of the Hubbard perturbation theory in the atomic limit and the multiband p - d Hamiltonian with the parameters calculated within LDA. We briefly discuss the method and focus on its applications to cuprates, manganites and cobaltites.

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Держатели документа:
[Korshunov, M. M.
Ovchinnikov, S. G.
Shneyder, E. I.
Gavrichkov, V. A.
Orlov, Yu. S.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Korshunov, M. M.
Ovchinnikov, S. G.
Gavrichkov, V. A.
Orlov, Yu. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Nekrasov, I. A.] Russian Acad Sci, Inst Electrophys, Ekaterinburg 620016, Russia
[Pchelkina, Z. V.] Russian Acad Sci, Inst Met Phys, Ekaterinburg 620219, Russia
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Institute for Electrophysics, Russian Academy of Sciences, Ekaterinburg 620016, Russian Federation
Institute for Metal Physics, Russian Academy of Sciences, Ekaterinburg 620219, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Orlov, Yu.S.; Орлов, Юрий Сергеевич; Nekrasov, I. A.; Pchelkina, Z. V.
}
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Decisive proofs of the s± → s++ transition in the temperature dependence of the magnetic penetration depth / V. A. Shestakov, M. M. Korshunov, Y. N. Togushova, O. V. Dolgov // Supercond. Sci. Technol. - 2021. - Vol. 34, Is. 7. - Ст. 075008, DOI 10.1088/1361-6668/abff6f. - Cited References: 40. - We are grateful to D V Efremov, A S Fedorov, S G Ovchinnikov, E I Shneyder, D Torsello, and A N Yaresko for useful discussions. This work was supported in part by the Russian Foundation for Basic Research (RFBR) Grant No. 19-32-90109 and by RFBR and Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science to the Research Projects 'Electronic correlation effects and multiorbital physics in iron-based materials and cuprates' Grant No. 19-42-240007. . - ISSN 0953-2048. - ISSN 1361-6668

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
ORDER-PARAMETER
   IMPURITIES
   SUPERCONDUCTORS
   STATES
   MODEL
Кл.слова (ненормированные):
unconventional superconductors -- iron pnictides -- iron chalcogenides -- impurity scattering -- penetration depth
Аннотация: One of the features of the unconventional s± state in iron-based superconductors is possibility to transform to the s++ state with the increase of the nonmagnetic disorder. Detection of such a transition would prove the existence of the s± state. Here we study the temperature dependence of the London magnetic penetration depth within the two-band model for the s± and s++ superconductors. By solving Eliashberg equations accounting for the spin-fluctuation mediated pairing and nonmagnetic impurities in the T-matrix approximation, we have derived a set of specific signatures of the s± → s++ transition: (1) sharp change in the behavior of the penetration depth λL as a function of the impurity scattering rate at low temperatures; (2) before the transition, the slope of ΔλL(T) = λL(T) - λL(0) increases as a function of temperature, and after the transition this value decreases; (3) the sharp jump in the inverse square of the penetration depth as a function of the impurity scattering rate, λL-2(Γa), at the transition; (4) change from the single-gap behavior in the vicinity of the transition to the two-gap behavior upon increase of the impurity scattering rate in the superfluid density ρs(T).

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
RAS, PN Lebedev Phys Inst, Moscow 119991, Russia.
Donostia Int Phys Ctr, San Sebastian 20018, Spain.

Доп.точки доступа:
Shestakov, V. A.; Шестаков, Вадим Андреевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Togushova, Yu. N.; Тогушова Ю. Н.; Dolgov, O., V; Russian Foundation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [19-32-90109]; RFBRRussian Foundation for Basic Research (RFBR); 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' [19-42-240007]
}
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Borisov, A. A.
Doping dependence of the band structure and chemical potential in cuprates by the generalized tight-binding method / A. A. Borisov, V. A. Gavrichkov, S. G. Ovchinnikov // Mod. Phys. Lett. B. - 2003. - Vol. 17, Is. 10-12. - P. 479-486, DOI 10.1142/S0217984903005500. - Cited References: 12 . - ISSN 0217-9849

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
CORRELATED ELECTRONS
SUPERCONDUCTIVITY
OXIDES
Аннотация: Quasiparticle band structure in hole doped CuO2 layer is calculated with account for strong electron correlations in the framework of multiband p-d model. For undoped layer we obtain the charge-transfer antiferromagnetic insulator. With doping unusual impurity-like quasiparticle appears at the top of the valence band with spectral weight proportional to doping concentration. In the overdoped regime the band structure in the paramagnetic phase results in the doping dependent Fermi surface in agreement to ARPES data.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Theoret Phys Chair, Krasnoyarsk 660041, Russia
ИФ СО РАН

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; International Conference on Modern Problems in Superconductivity(3 ; 2002 ; Sept. ; 9-14 ; Yalta, Ukrain)
}
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10.

    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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11.

    Doping dependent band structure and pairing in strongly correlated electron systems of high-Tc cuprates / S. G. Ovchinnikov [и др.] // V International symposium on strong nonlinear vibronic and electronic interactions in solids : program, book of abstracts . - 2015. - Ст. O18. - P. 28. - Библиогр.: 1 назв.
   Перевод заглавия: Зависящие от допирования зонная структура и спаривание в системах с сильными электронными корреляциями ВТСП купратов

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Korshunov, M. M.; Коршунов, Максим Михайлович; Makarov, I. A.; Макаров, Илья Анатольевич; International symposium on strong nonlinear vibronic and electronic interactions in solids(5 ; 2015 ; May ; 1-3 ; Tartu)
}
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12.

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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13.

Makarov, I. A.
Effect of electron-phonon interaction on the doping and temperature depended spectral function in cuprates / I. A. Makarov, S. G. Ovchinnikov // Superstripes 2017 : [absrtacts] / ed. A. Bianconi : Superstripes press, 2017. - Ст. 37.1. - P. 206. - (Science Series ; Vol. 11) . - ISBN 9788866830696
Аннотация: The generalized tight binding (GTB) method to calculate the electronic structure of strongly correlated electrons in cuprates is modified to incorporate also strong electronphonon interaction. By exact diagonalization of the p-d- Holstain model Hamiltonian for a separate CuO6 unit cell we find the multelectron and multiphonon local eigenstates that are used to construct a set of local Hubbard operators. Then we treat the intercell electron hopping t by the perturbation approach over small ratio t/U, where U is the charge transfer excitation energy. Without electron-phonon interaction we obtain the band of spin polaron and a set of local multiphonon Franck-Condon excitations. The electron-phonon interaction results in the hybridization of spin polaron and Franck Condon excitations that forms the polaronic band structure with strong temperature dependence. The temperature dependence of the polaronic band structure and Fermi surface is discussed. The peak of a spectral function at the top of the valence band has large width typical to the ARPES data and determined by a large number of the multiphonon excitations.

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Доп.точки доступа:
Bianconi, A. \ed.\; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич; International Conference on Quantum in Complex Matter: Superconductivity, Magnetism and Ferroelectricity(2017 ; June 5-10 ; Ischia, Italy); Superstripes 2017. Quantum in Complex Matter: Superconductivity, Magnetism and Ferroelectricity(2017 ; June 5-10 ; Ischia, Italy)
}
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14.

Effect of external pressure on the normal and superconducting properties of high-Tc cuprates / K. A. Sidorov [et al.] // Phys. Status Solidi B. - 2016. - Vol. 253, Is. 3. - P. 486-493, DOI 10.1002/pssb.201552465. - Cited References: 50. - We are thankful to Dr. M.M. Korshunov for useful discussions. This work was supported by RFBR Grants 13-02-01395, 14-02-00186, grant of Russian President NSh-2886.2014.2, and the Ministry of Education and Science of Russia (SibFU Government Contract for 2014-2016, No. 3085). . - ISSN 0370-1972

РУБ Physics, Condensed Matter
Рубрики:
HYDROSTATIC-PRESSURE
   ELECTRONIC-STRUCTURE
   EXCHANGE INTERACTION
   HEISENBERG-MODEL
   COPPER OXIDES
   FERMI-SURFACE
   SPIN-WAVE
Кл.слова (ненормированные):
cuprates -- electronic structure -- Fermi surface -- Lifshitz transitions -- strongly correlated electrons -- superconducting properties
Аннотация: The pressure effects on the normal state electronic structure, the superexchange interaction, and the critical temperature of d-type superconductivity mediated by magnetic pairing have been studied within the multielectron hybrid scheme LDA+GTB that takes into account electron correlations in CuO2 planes. We have found the changes of the multiband p–d model parameters at 3% compression of different symmetry: (i) hydrostatic, (ii) along the c-axis, and (iii) in a–b plane. We have studied the changes of the Fermi surface under external pressure for different hole doping concentration x. In general, this effect is too small except two critical concentrations xc1≈0.15 and xc2=0.24 where the Lifshitz transitions occur with the change of the Fermi surface topology. In the vicinity of the critical concentration, we have found the giant change of the Fermi surface area up to 100% related to the pressure-induced Lifshitz transition. The effects of pressure on the antiferromagnetic coupling J and the mean-field value of Tc are obtained in a good agreement to experimental data.

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Доп.точки доступа:
Sidorov, K. A.; Сидоров, Кирилл Александрович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Nikolaev, S. V.; Николаев, Сергей Викторович; Pchelkina, Z. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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15.

Ovchinnikov, S. G.
Effect of interlayer tunneling on the electronic structure of bilayer cuprates and quantum phase transitions in carrier concentration and high magnetic field / S. G. Ovchinnikov, I. A. Makarov, E. I. Shneyder // J. Exp. Theor. Phys. - 2011. - Vol. 112, Is. 2. - P. 288-302, DOI 10.1134/S106377611005119X. - Cited References: 64. - This study was supported financially by the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences (project no. 5.7), the integration projects of the Siberian Branch and the Ural Division of the Russian Academy of Sciences (project no. 40), the Russian Foundation for Basic Research (project no. 09-02-00127), the President of the Russian Federation (grant no. MK-1683.2010.2), and the Federal Target Program P891. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   HIGH-TEMPERATURE SUPERCONDUCTORS
   DIMENSIONAL HUBBARD-MODEL
   FERMI-SURFACE
   COPPER OXIDES
   GROUND-STATE
   CUO2 PLANES
   SPECTRUM
   BAND
   NMR
Кл.слова (ненормированные):
Antibonding -- Bi-layer -- Bilayer cuprates -- Complex sequences -- Cuprates -- Doping levels -- External magnetic field -- Field magnitude -- Hartree-Fock approximations -- High magnetic fields -- Lifshitz transition -- Main effect -- Orbitals -- Perturbation theory -- Quantum phase transitions -- Quantum transitions -- Single-layer structure -- Theoretical study -- Unit cells -- Carrier concentration -- Copper compounds -- Density functional theory -- Electronic properties -- Electronic structure -- Hartree approximation -- Magnetic fields -- Perturbation techniques -- Phase transitions -- Surface structure -- Quantum theory
Аннотация: We present a theoretical study of the electronic structure of bilayer HTSC cuprates and its evolution under doping and in a high magnetic field. Analysis is based on the t-t'-taEuro(3)-J* model in the generalized Hartree-Fock approximation. Possibility of tunneling between CuO2 layers is taken into account in the form of a nonzero integral of hopping between the orbitals of adjacent planes and is included in the scheme of the cluster form of perturbation theory. The main effect of the coupling between two CuO2 layers in a unit cell is the bilayer splitting manifested in the presence of antibonding and bonding bands formed by a combination of identical bands of the layers themselves. A change in the doping level induces reconstruction of the band structure and the Fermi surface, which gives rise to a number of quantum phase transitions. A high external magnetic field leads to a fundamentally different form of electronic structure. Quantum phase transitions in the field are observed not only under doping, but also upon a variation of the field magnitude. Because of tunneling between the layers, quantum transitions are also split; as a result, a more complex sequence of the Lifshitz transitions than in single-layer structures is observed.

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Влияние межслойного туннелирования на электронную структуру двухслойных купратов и квантовые фазовые переходы по концентрации носителей и сильному магнитному полю [Текст] / С. Г. Овчинников, И. А. Макаров, Е. И. Шнейдер // Журнал экспериментальной и теоретической физики. - 2011. - Т. 139 Вып. 2. - С. 334-350

Держатели документа:
[Ovchinnikov, S. G.
Makarov, I. A.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.
Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
}
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16.

Effect of Lifshitz quantum phase transitions on the normal and superconducting states in cuprates [Text] / S. G. Ovchinnikov, M. M. Korshunov, E. I. Shneyder // International Conference "Functional Materials" (ICFM-09) : book of abstracts : October 5-10, Ukraine, Crimea, Partenit. - 2009. - P10

Доп.точки доступа:
Ovchinnikov, S.G.; Korshunov, M.M.; Shneyder, E.I.; "Functional Materials", International Conference(4 ; 2009 ; OCT ; Partenit, Crimea, Ukraine)
}
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17.

Effect of Lifshitz quantum phase transitions on the normal and superconducting states in cuprates [Text] / S. G. Ovchinnikov, M. M. Korshunov, E. I. Shneyder // Bogolyubov Kiev Conference "Modern Problems of Theoretical and Mathematical Physics". - 2009. - P27

Доп.точки доступа:
Ovchinnikov, S.G.; Korshunov, M.M.; Shneyder, E.I.; "Modern Problems of Theoretical and Mathematical Physics", Bogolyubov Kiev Conference(2009 ; SEP ; 15-18 ; Kiev)
}
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18.

Gavrichkov, V. A.
Effect of pressure on the electronic structure of cuprates with strongly correlated electrons / V. A. Gavrichkov, S. G. Ovchinnikov, G. V. Ul'm // Phys. Solid State. - 2007. - Vol. 49, Is. 4. - P. 608-612, DOI 10.1134/S1063783407040026. - Cited References: 11. - This work was supported by the Russian Foundation for Basic Research (project no. 06-02-16100), the Presidium of the Russian Academy of Sciences (program “Quantum Macrophysics”), and the Siberian Division of the Russian Academy of Sciences (complex integration project no. 3.4) . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
COPPER OXIDES
Аннотация: For cuprates of the n and p types, the effect of pressure on the electronic structure of a CuO2 layer is studied. In the calculations performed, a generalized tight-binding method is used taking into account the influence of strong electronic correlations on the electronic structure of cuprates. The results obtained demonstrate the unusual effect of pressure on the nature of quasiparticle states at the top of the valence band in p-type cuprates. As the pressure increases, the hole states in these materials cease to be Zhang-Rice singlets and become combined singlet-triplet states.

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Публикация на русском языке Влияние давления на электронную структуру купратов в режиме сильных электронных корреляций [Текст] / В. А. Гавричков, С. Г. Овчинников, Г. В. Ульм // Физ. тверд. тела. - 2007. - Т. 49 Вып. 4. - С. 580-583

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Ul'm, G. V.; Гавричков, Владимир Александрович
}
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19.

Effect of short antiferromagnetic correlations on the normal and superconducting properties in copper oxides / S. G. Ovchinnikov, M. M. Korshunov, E. I. Shneyder // Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2011. - Vol. 168-169. - P561-566, DOI 10.4028/www.scientific.net/SSP.168-169.561 . - ISSN 1012-0394
Кл.слова (ненормированные):
high temperature superconductivity -- short range antiferromagnetic order -- strong electron correlations -- antiferromagnetic materials -- antiferromagnetism -- copper oxides -- electron correlations -- electron density measurement -- antiferromagnetism -- electron correlations -- ab initio -- antiferromagnetic correlations -- cuprates -- high-t -- high-temperature superconductivity -- hubbard -- low energies -- multiband model -- short range antiferromagnetic order -- strong electron correlations -- superconducting properties -- t-j models -- antiferromagnetic orderings -- superconductivity -- copper oxides -- high temperature superconductivity
Аннотация: The abnormal "normal" state and origin of high temperature superconductivity in cuprates are still not clear [1-2]. The strong electron correlations (SEC) are known to be one of the main difficulties for the theory of high- Tc cuprates. The conventional LDA (local density approximation) approach to the band structure fails in the regime of SEC. Various realistic multiband models of a CuO2 layer at low energy result in the effective Hubbard or t - J models [3-7]. The hybrid LDA+GTB scheme [8] generates the low-energy effective t - t? - t? - J* model with all parameters calculated ab initio.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian Aerospace University, Krasnoyarsk, 660014, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, University of Florida, Gainesville, FL 32611, United States

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Shneyder, E. I.; Шнейдер, Елена Игоревна
}
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20.

Korshunov, M. M.
Effective hamiltonian and properties of the normal and superconducting phases of n-type cuprates / M. M. Korshunov, S. G. Ovchinnikov, A. V. Sherman // JETP Letters. - 2004. - Vol. 80, Is. 1. - P. 39-43, DOI 10.1134/1.1800212. - Cited References: 32 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   ORDER-PARAMETER
   QUASI-PARTICLES
   COPPER OXIDES
   FERMI-SURFACE
   ELECTRON
   SYMMETRY
   RANGE
   ND1.85CE0.15CUO4
   TRANSITIONS
Аннотация: An effective low-energy Hamiltonian is derived from a microscopic multiband p-d model in the regime of strong electron correlations. The parameters of the p-d model are determined by comparison with the ARPES data for undoped Nd2CuO4. The Hamiltonian is the t-J* model in which hopping and exchange slowly decay with distance and are taken into account up to the fifth coordination sphere. The quasiparticle band structure is calculated as a function of the doping concentration with regard to short-range magnetic order, and the superconductivity theory with the spin-fluctuation pairing mechanism is constructed. Assuming that the parameters of the model do not depend on the doping level, we obtained quantitative agreement with the properties observed experimentally for the normal and superconducting phases without introducing fitting parameters. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Institute of Physics, University of Tartu, Tartu, 51014, Estonia

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