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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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Avramov, P. V.
The strong electron correlation effects in XAFS spectra of HTSC cuprates / P. V. Avramov, S. G. Ovchinnikov // J. Phys. IV. - 1997. - Vol. 7: 9th International Conference on X-Ray Absorption Fine Structure (AUG 26-30, 1996, GRENOBLE, FRANCE), Is. C2. - P. 183-185. - Cited References: 11 . - ISSN 1155-4339

РУБ Physics, Multidisciplinary
Рубрики:
X-RAY-ABSORPTION
   MULTIPLE-SCATTERING ANALYSIS
   EDGE STRUCTURE
   LA2CUO4
   XANES
Аннотация: Theoretical XAFS spectra of highly correlated copper oxides have been presented as a product of a single-electron part obtained by the SCF X alpha- SW method, and a multi-electron part obtained by the multi-band multi-electron p-d model. The main line of CuK-spectrum of La2CuO4 was aligned to the Cud(10) (L) under bar configuration and the single satellite line was aligned to the Cud(9). Comparison of the theoretical data with the experimental ones shows that the ground state of the two-holes in the CuO4 doped cell is triplet. The last conclusion has been confirmed by analysis of CuL2,3-spectra of two-hole impurity states of doped CuO4 cell. Another interesting future of CuL2,3-spectra a peak 2.8 eV higher the threshold was aligned to the transitions into quasi-stationary states due to existence of a high barrier in the Cud-state potential.

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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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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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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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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    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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    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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10.

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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11.

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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12.

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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13.

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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14.

Effective parameters of the band dispersion in n-type high-T-c superconductors / M. M. Korshunov [et al.] // Physica C. - 2004. - Vol. 402, Is. 4. - P. 365-370, DOI 10.1016/j.physc.2003.10.017. - Cited References: 32 . - ISSN 0921-4534

РУБ Physics, Applied
Рубрики:
DOPED CUPRATE SUPERCONDUCTORS
   TIGHT-BINDING METHOD
   QUASI-PARTICLES
   COPPER OXIDES
   LA2-XSRXCUO4
   SYMMETRY
   MODEL
   EVOLUTION
   ORDER
Кл.слова (ненормированные):
high-T-c superconductivity -- electronic correlations -- electron-doped cuprates -- Electron-doped cuprates -- Electronic correlations -- High-Tc superconductivity -- Approximation theory -- Atomic physics -- Band structure -- Binding energy -- Charge transfer -- Correlation methods -- Doping (additives) -- Electronic structure -- Hamiltonians -- Mathematical models -- Mathematical operators -- Oxide superconductors -- Perturbation techniques -- Photoelectron spectroscopy -- Atomic orbitals -- Conduction band -- Electron doped cuprates -- Electron spins -- Valence band -- High temperature superconductors
Аннотация: The electronic structure of electron-doped cuprates is discussed in the regions of small and optimal doping. For optimal doping we obtain the parameters from a simple tight-binding analysis by fitting ARPES data, and for small doping we study the band structure by the generalized tight-binding method that takes strong electronic correlations into account explicitly. This method has also reproduced well the ARPES data for small doping. The effective low-energy Hamiltonian is the t-t'-J model with hopping parameters t and t'. We compare both methods and find very good agreement for the value of t while t' is different because it is caused by the different contribution of the short-range spin correlations. (C) 2003 Elsevier B.V. All rights reserved.

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Держатели документа:
Free Univ Berlin, Inst Theoret Phys, D-14195 Berlin, Germany
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Science, Krasnoyarsk 660036, Russian Federation
Inst. fur Theoretische Physik, Freie Universitat Berlin, Arnimallee 14, D-14195 Berlin, Germany

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Manske, D.; Eremin, I.
}
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15.

Electron structure and electron-phonon interaction in the strongly correlated electron system of cuprates / S. G. Ovchinnikov [et al.] // Low Temp. Phys. - 2006. - Vol. 32, Is. 4-5. - P. 483-488 ; Физика низких температур, DOI 10.1063/1.2199450. - Cited References: 37 . - ISSN 1063-777X

РУБ Physics, Applied
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   HIGH-TC SUPERCONDUCTIVITY
   C SUPERCONDUCTORS
   J MODEL
   BAND
   REPRESENTATION
   REGIME
   OXIDES
Аннотация: The generalized tight-binding method presents a practical realization of the scheme that describes quasiparticles in a strongly correlated electron system and consists of exact intra-cell diagonalization of the model Hamiltonian and perturbative treatment of the inter-cell hoppings. In the present paper this method and its ab initio modification are applied to undoped and weakly doped HTSC cuprates. Results are in very good agreement with the experimental ARPES data on various compounds. Starting with a multiband p-d model the realistic effective low-energy Hamiltonian of strongly correlated electrons interacting with spin fluctuations and phonons is derived both for hole- and electron-doped systems. Without electron-phonon interaction the pure magnetic mechanism of pairing does not provide the correct value of T, even for single-layer La2-xSrxCuO4 and Nd2-xCexCuO4. (c) 2006 American Institute of Physics.

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

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Korshunov, M. M.; Коршунов, Максим Михайлович; Shneyder, E. I.; Шнейдер, Елена Игоревна

}
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16.

Electronic structure and properties of high-Tc superconducting cuprates in the normal and superconducting phases within the LDA + GTB approach / E. I. Shneyder [et al.] // JETP Letters. - 2012. - Vol. 96, Is. 5. - P. 349-360, DOI 10.1134/S0021364012170146. - Cited References: 107. - This work was supported by the Russian Foundation for Basic Research (project no. 09-02-00127), by the Presidium of the Russian Academy of Sciences (program no. 20.7), by the Ministry of Education and Science of the Russian Federation (state contract nos. P891 and 16.740.12.0731), and by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project nos. NSh-1044.2012.2 and MK-1168.2012.2). E.I.Sh. and M. M. K. acknowledge the support of the Dynasty Foundation. . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
2-DIMENSIONAL HUBBARD-MODEL
   D-WAVE SUPERCONDUCTIVITY
   HIGH-TEMPERATURE SUPERCONDUCTORS
   QUANTUM CRITICAL-POINT
   T-C SUPERCONDUCTOR
   FERMI-SURFACE
   EXCHANGE INTERACTION
   SQUARE-LATTICE
   BAND-STRUCTURE
   COPPER OXIDES
Аннотация: Theoretical investigations of the properties of high-T c superconducting cuprates within the LDA + GTB method taking into account the magnetic and phonon pairing mechanisms have been reviewed. These properties are the concentration-dependent electronic structure, quantum phase transitions with a change in the topology of the Fermi surface, and the superconducting phase of the d_{x. - y. } symmetry.

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Публикация на русском языке Электронная структура и свойства ВТСП-купратов в нормальной и сверхпроводящей фазах в рамках LDA+GTB-подхода [Текст] / Е. И. Шнейдер [и др.] // Письма в Журн. эксперим. и теор. физ. - 2012. - Т. 96 Вып. 5-6. - С. 381-394

Держатели документа:
[Shneyder, E. I.
Ovchinnikov, S. G.
Korshunov, M. M.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Shneyder, E. I.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Ovchinnikov, S. G.
Korshunov, M. M.
Nikolaev, S. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Nikolaev, S. V.
}
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17.

From underdoped to overdoped cuprates: two quantum phase transitions / S. G. Ovchinnikov, E. I. Shneyder, M. M. Korshunov // arXiv. - 2009. - Ст. arXiv:0908.0576

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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
}
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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.

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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20.

Gavrichkov, V. A.
Lattice source for charge and spin inhomogeneity in 2D perovskite cuprates / V. A. Gavrichkov, S. I. Polukeev // Phys. B: Condens. Matter. - 2024. - Vol. 673. - Ст. 415457, DOI 10.1016/j.physb.2023.415457. - Cited References: 31. - We acknowledge the support of the Russian Science Foundation through grant RSF No. 22-22-00298 . - ISSN 0921-4526. - ISSN 1873-2135
Кл.слова (ненормированные):
Charge inhomogeneity -- Jahn–Teller (pseudo-) effect -- Doped 2D perovskite cuprates -- Phonon chirality
Аннотация: In the work we highlight the structural features of 2D perovskite cuprates (tilted CuO6 octahedra with different orientation with respect to spacer rocksalt layers), where sources of charge and spin inhomogeneity can be hidden. We used the impurity Anderson model with the Jahn–Teller(JT) local cells to show the charge inhomogeneity arises at any low doping concentration x, but disappears when the doping level exceeds threshold concentration xc, and the smaller the magnitudes xc, the larger the area of regions with JT pseudo effect. It is expected that spontaneous chiral symmetry breaking in the dynamic JT state of the stripe CuO2 layer as a whole can lead to the appearance of the goldstone phonon mode. As consequence, the giant thermal Hall effect could be observed in the 2D perovskite cuprates with CuO6 octahedra, rather than with CuO4 squares, e.g. in the Tl-based n layer cuprates or cuprates based on infinite-layer CaCuO2 structure.

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Держатели документа:
L. V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Гавричков, Владимир Александрович
}
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