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Coulomb repulsion of holes and competition between dx2−y2 -wave and s-wave parings in cuprate superconductors / V. V. Val'kov [et al.] // J. Exp. Theor. Phys. - 2017. - Vol. 125, Is. 5. - P. 810-821, DOI 10.1134/S1063776117110085. - Cited References: 51. - This work was supported by the Russian Foundation for Basic Research, the Government of Kras-noyarsk Region, the Krasnoyarsk Region Science and Technology Support Fund (project nos. 16-42-240435, 16-42-243056, and 16-42-243057), and the Program by the Siberian Branch, Russian Academy of Sciences (project no. 356-2015-0406). The work of A.F.B. was supported by the Russian Foundation for Basic Research (project no. 16-02-00304). The work of M.M.K. was supported by the Council for Grants of the President of the Russian Federation (MK-1398.2017.2). . - ISSN 1063-7761
Кл.слова (ненормированные):
Cooper instability -- Coulomb repulsions -- Crystallographic structure -- Inter-site coulomb interactions -- Order parameter symmetry -- Quasiparticles -- Self-consistency equations -- Super conducting phasis
Аннотация: The effect of the Coulomb repulsion of holes on the Cooper instability in an ensemble of spin–polaron quasiparticles has been analyzed, taking into account the peculiarities of the crystallographic structure of the CuO2 plane, which are associated with the presence of two oxygen ions and one copper ion in the unit cell, as well as the strong spin–fermion coupling. The investigation of the possibility of implementation of superconducting phases with d-wave and s-wave of the order parameter symmetry has shown that in the entire doping region only the d-wave pairing satisfies the self-consistency equations, while there is no solution for the s-wave pairing. This result completely corresponds to the experimental data on cuprate HTSC. It has been demonstrated analytically that the intersite Coulomb interaction does not affect the superconducting d-wave pairing, because its Fourier transform Vq does not appear in the kernel of the corresponding integral equation.

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Публикация на русском языке Кулоновское отталкивание дырок и конкуренция dx2-y2- и s-спариваний в купратных сверхпроводниках [Текст] / В. В. Вальков [и др.] // Журн. эксперим. и теор. физ. - 2017. - Т. 152 Вып. 5. - С. 957-969

Держатели документа:
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center,”, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Reshetnev Siberian State University of Science and Technologies, Krasnoyarsk, Russian Federation
Vereshchagin Institute of High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.
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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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Dzebisashvili, D. M.
Fermi surface evolution in the ensemble of spin-polarized quasiparticles in La2 - xSrxCuO4 / D. M. Dzebisashvili, V. V. Val'kov, A. F. Barabanov // JETP Letters. - 2014. - Vol. 98, Is. 9. - P. 528-533, DOI 10.1134/S0021364013220049. - Cited References: 36. - This work was supported by the Presidium of the Russian Academy of Sciences (program "Quantum Mesoscopic and Disordered Structures"), by the Russian Foundation for Basic Research (project nos. 13-02-00909, 13-02-00523, and 11-02-98007-Siberia), and by the Dynasty Foundation. . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
SADDLE-POINT SINGULARITY
   ANTIFERROMAGNETIC CORRELATIONS
   CUPRATE SUPERCONDUCTORS
   NORMAL-STATE
   MODEL
   BI2SR2CACU2O8+DELTA
   YBA2CU3O6.9
   LA2CUO4
   EXCITATIONS
   YBA2CU4O8
Аннотация: For the spin-fermion model, it has been shown that the concept of spin polarons makes it possible to reproduce fine details of the Fermi surface evolution in the nodal direction of La2-xSrxCuO4 occurring with changes in the doping level x. The physics here is determined by the spin-correlated hopping of charge carriers and by the doping dependence of the inverse magnetic correlation length. © 2013 Pleiades Publishing, Inc.

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Публикация на русском языке Дзебисашвили, Дмитрий Михайлович. Эволюция ферми-поверхности ансамбля спин-поляронных квазичастиц в La2−xSrxCuO4 [Текст] / Д. М. Дзебисашвили, В. В. Вальков, А. Ф. Барабанов // Письма в Журн. эксперим. и теор. физ. : Наука, 2013. - Т. 98 Вып. 9. - С. 596-601

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Russian Acad Sci, Inst High Pressure Phys, Troitsk 142092, Moscow Region, Russia

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Barabanov, A. F.; Дзебисашвили, Дмитрий Михайлович
}
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Evolution of the band structure of quasiparticles with doping in copper oxides on the basis of a generalized tight-binding method / V. A. Gavrichkov [et al.] // J. Exp. Theor. Phys. - 2000. - Vol. 91, Is. 2. - P. 369-383, DOI 10.1134/1.1311997. - Cited References: 45 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   CUPRATE SUPERCONDUCTORS
   ELECTRONIC-STRUCTURE
   EXCITATIONS
   DEPENDENCE
   TEMPERATURE
   DERIVATION
   SR2CUO2CL2
   SPECTRUM
   DENSITY
Аннотация: Two methods for stabilizing the two-hole B-3(1g) state as the ground state instead of the Zhang-Rice singlet are determined on the basis of an orthogonal cellular basis for a realistic multiband pd model of a CuO2 layer and the dispersion relations for the valence band top in undoped and doped cases are calculated. In the undoped case, aside from the valence band, qualitatively corresponding to the experimental ARPES data for Sr2CuO2Cl2 and the results obtained on the basis of the t-t'-J model, the calculations give a zero-dispersion virtual level at the valence band top itself. Because of the zero amplitude of transitions forming the virtual level the response corresponding to it is absent in the spectral density function. In consequence, the experimental ARPES data do not reproduce its presence in this antiferromagnetic undoped dielectric. A calculation of the doped case showed that the virtual level transforms into an impurity-type band and acquires dispersion on account of the nonzero occupation number of the two-hole states and therefore should be detected in ARPES experiments as a high-energy peak in the spectral density. The computed dispersion dependence for the valence band top is identical to the dispersion obtained by the Monte Carlo method, and the ARPES data for optimally doped Bi2Sr2CaCu2O8 + delta samples. The data obtained also make it possible to explain the presence of an energy pseudogap at the symmetric X point of the Brillouin band of HTSC compounds. (C) 2000 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Эволюция зонной структуры квазичастиц с допированием в оксидах меди в рамках обобщенного метода сильной связи [Текст] / В. А. Гавричков [и др.] // Журн. эксперим. и теор. физ. - 2000. - Т. 118 Вып. 2. - С. 422-437

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Borisov, A. A.; Goryachev, E. G.
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Ovchinnikov, S. G.
Quasiparticles in strongly correlated electronic systems in cuprate oxides / S. G. Ovchinnikov // Uspekhi Fiz. Nauk. - 1997. - Vol. 167, Is. 10. - P. 1043-1068. - Cited References: 227 . - ISSN 0042-1294

РУБ Physics, Multidisciplinary
Рубрики:
T-J-MODEL
   HIGH-TEMPERATURE SUPERCONDUCTORS
   DIMENSIONAL HUBBARD-MODEL
   QUASI-PARTICLE DISPERSION
   HEISENBERG-ANTIFERROMAGNET SR2CUO2CL2
   ANGLE-RESOLVED PHOTOEMISSION
   CHARGE FLUCTUATION REGIME
   SADDLE-POINT SINGULARITY
   SINGLET-TRIPLET MODEL
   LA-SR-CU
Аннотация: New experimental and theoretical results on the electronic structure and spectral properties of quasiparticles in cuprate oxides are reviewed. It is shown that the electronic structure transforms from antiferromagnetic insulators to optimally doped high-temperature superconductors as the doping level is varied. The experimental methods considered are primarily angular resolved photoelectron spectroscopy (ARPES), neutron scattering, and NMR. Two types of electronic structure calculations for data interpretation purposes are considered, namely, exact numerical methods for finite clusters (exact diagonalisation and the quantum Monte Carlo method) and approximate schemes for the infinite lattice. As a result, a coherent unified picture emerges, in which the magnetic polaron of a weakly doped antiferromagnetic lattice transforms into a system of Fermi particles dressed by short-range antiferromagnetic type spin fluctuations. In the region of weakly doped metal compositions, deviations from Fermi-liquid properties are seen, such as the failure of Luttinger's theorem, shadowy photoemission bands, and the spin pseudogap effect in spectral and thermodynamic measurements. The situation in the neighbourhood of the insulator-metal concentration transition is described as least understood.

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Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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Ovchinnikov, S. G.
The exact spectrum of Fermi quasiparticles in Kondo-Anderson ferromagnetic lattice / S. G. Ovchinnikov, L. Y. Yakimov // Phys. Solid State. - 2003. - Vol. 45, Is. 8. - P. 1479-1483, DOI 10.1134/1.1602883. - Cited References: 8. - This work was supported by the federal program “Integration” (project no. B 0017) and the Russian Foundation for Basic Research (project no. 02-02-97705) . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC POLARON
Аннотация: The spectrum of Fermi excitations of a nondegenerate ferromagnetic semiconductor at T=0 with one electron present is investigated in order to describe the electronic structure of manganites with inclusion of strong electron correlations within the Anderson periodic model with s-d exchange interaction. Exact dispersion relations and the Green functions for different spin projections are found. The density-of-states function is calculated for different positions of the d level relative to the band bottom. (C) 2003 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Точный спектр фермиевских квазичастиц в ферромагнитной решетке Кондо-Андерсона [Текст] / С. Г. Овчинников, Л. Е. Якимов // Физ. тверд. тела. - 2003. - Т. 45 Вып. 8. - С. 1409-1413

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:
Yakimov, L. Y.; Овчинников, Сергей Геннадьевич
}
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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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Val'kov, V. V.
d-Wave pairing 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 // Bull. Russ. Acad. Sci. Phys. - 2015. - Vol. 79, Is. 6. - P. 781-783, DOI 10.3103/S1062873815060350. - Cited References: 12. - This work was supported by the Russian Foundation for Basic Research, project nos. 13-02-00523 and 13-02-00909; and by the Dynasty Foundation. . - ISSN 1062-8738
Аннотация: It is shown that the strong coupling between spin moments of copper ions and oxygen holes resulting from the hybridization processes in the Emery model determines the formation of spin-polaron quasiparticles and ensures their effective attraction. This induces Cooper instability with d-wave pairing of spinpolaron quasiparticles. The obtained phase diagram agrees with the available experimental data. © 2015, Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. d-волновое спаривание спин-поляронных квазичастиц в спин-фермионной модели электронного строения CuO2-плоскoсти [Текст] / В. В. Вальков, Д. М. Дзебисашвили, А. Ф. Барабанов // Изв. РАН. Сер. физич. - 2015. - Т. 79 № 6. - С. 867–869

Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation
Vereshchagin Institute for High Pressure Physics, Troitsk, Moscow oblast, Russian Federation

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович
}
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Val'kov, V. V.
Distribution function of Hubbard quasiparticles in two-dimensional systems with inclusion of dynamic processes of spin-fluctuation scattering / V. V. Val'kov, D. M. Dzebisashvili // Phys. Solid State. - 2009. - Vol. 51, Is. 5. - P. 877-883, DOI 10.1134/S1063783409050011. - Cited References: 18. - This study was supported by the Russian Foundation for Basic Research (project no. 06-02-16100) and performed within the framework of the Program of the Branch of General Physics and Astronomy of the Russian Academy of Sciences and the Integration Project of the Siberian Branch of the Russian Academy of Sciences. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
STATE
Аннотация: Spin-fluctuation scattering in an ensemble of strongly correlated electrons in CuO(2) planes of high-temperature superconductors is investigated. It is demonstrated that this process significantly modifies the distribution function of Hubbard quasiparticles. The influence of spin-fluctuation scattering mathematically manifests itself in the appearance of the correction to the strength operator in the numerator of the single-fermion Green's function dependent on the Matsubara frequency. This correction differently renormalizes the spectral intensity on different energy scales and determines the dependence of the Migdal discontinuity on the electron concentration in the system.

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Держатели документа:
[Val'kov, V. V.
Dzebisashvili, D. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [06-02-16100]
}
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10.

Val'kov, V. V.
Influence of the Coulomb repulsions on the formation of the superconducting gap of the spin-polaron quasiparticles in cuprates / V. V. Val'kov, M. M. Korovushkin, A. F. Barabanov // J. Low Temp. Phys. - 2019. - Vol. 196, Is. 1-2. - P. 242–252, DOI 10.1007/s10909-018-02120-3. - Cited References: 26. - 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 (Projects Nos. 16-02-00304 and 18-02-00837) 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” and 18-42-243018 “Contact phenomena and magnetic disorder in the problem of the formation and detection of topological edge states in semiconductor nanostructures”), and the grant of the President of the Russian Federation (Project MK-1398.2017.2). . - ISSN 0022-2291. - ISSN 1573-7357
Кл.слова (ненормированные):
Cuprate superconductors -- Intersite Coulomb interaction -- Spin polarons -- Spin-charge correlations -- Unconventional superconductivity
Аннотация: Taking into account the real crystalline structure of the CuO2 plane and the strong spin-fermion coupling, the influence of the on-site Coulomb repulsion of holes Up and the intersite Coulomb repulsion V2 between holes located at the next-nearest-neighbor oxygen ions on the formation of the superconducting gap with the d-wave symmetry of the order parameter of the spin-polaron quasiparticles is studied. It is shown that the formation of the resulting superconducting gap within the spin-fermion model is caused by three components. The dependence of the narrowing of the superconducting gap on the values Up and V2 is analyzed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Vereshchagin Institute for High Pressure Physics, Troitsk, Moscow, Russia

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович
}
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