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Anomalous resistivity and the electron-polaron effect in the two- band Hubbard model with one narrow band / Kagan M.Yu., Val'kov V.V. // arXiv. - 2011. - Ст. 1111.3135

Доп.точки доступа:
Kagan, M.Yu.; Val'kov, V. V.; Вальков, Валерий Владимирович
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Aplesnin, S. S.
Formation of a spin density wave in copper metaborate by a spin polaron / S. S. Aplesnin // J. Phys.: Condens. Matter. - 2004. - Vol. 16, Is. 32. - P. 5907-5914, DOI 10.1088/0953-8984/16/32/023. - Cited References: 12 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
SOLITON LATTICE
CUB2O4
Кл.слова (ненормированные):
Absorption -- Correlation methods -- Electric fields -- Infrared radiation -- Magnetization -- Mathematical models -- Polarons -- Specific heat -- Intraband transition -- Optical conductivity -- Spin density waves -- Spin polaron -- Copper compounds
Аннотация: Formation of incommensurate three-dimensional magnetic order below T* similar to 10 K in CuB2O4 is explained on the basis of strong correlation between the holes and localized spins. The Kondo lattice model is analysed for the case where spin polarons are the elementary excitations. The origin of the low-temperature specific heat maximum at T similar to 5 K is associated with a displacement of the polaron band bottom. A set of anomalies in the temperature dependence of the conductivity, shift of the optical conductivity maximum in the range of energies 0.02-0.12 eV and decreasing of the infrared absorption intensity is predicted.

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

Доп.точки доступа:
Аплеснин, Сергей Степанович
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Aplesnin, S. S.
Nonadiabatic interaction of acoustic phonons with spins S=1/2 in the two-dimensional Heisenberg model / S. S. Aplesnin // J. Exp. Theor. Phys. - 2003. - Vol. 97, Is. 5. - P. 969-977, DOI 10.1134/1.1633952. - Cited References: 18 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
QUANTUM MONTE-CARLO
   EU2CUO4
   GD2CUO4
   POLARON
Кл.слова (ненормированные):
Antiferromagnetic materials -- Correlation methods -- Crystal symmetry -- Magnetic couplings -- Magnetic moments -- Magnetization -- Monte Carlo methods -- Quantum theory -- Acoustic phonons -- Nonadiabatic interaction -- Orthorhombicity -- Quantum spin liquid transitions -- Phonons
Аннотация: The ground state of a two-dimensional antiferromagnet having spins S = 1/2 and interacting with acoustic phonons is investigated in the nonadiabatic approximation using the quantum-mechanical Monte Carlo method. The critical parameters of the spin-phonon coupling, corresponding to the formation of bound spin-phonon excitations, crystal symmetry lowering, and the emergence of a gap in the spin excitation spectrum, as well as the antiferromagnet-quantum spin liquid transition, are determined. The orthorhombicity parameter, the sublattice magnetization, the violation of the spherical symmetry of spin-spin correlation functions, and the magnetic moment in Gd2CuO4 and Eu2CuO4 are calculated. (C) 2003 MAIK "Nauka / Interperiodica".

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

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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Competition of d- and s- wave superconductivity induced by exchange interactions in the spin-polaron ensemble / V. V. Val'kov [и др.] // Moscow Int. Symp. on Magnet. (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 3OR-D-14. - P. 359. - Cited References: 3. - The work was supported by the Russian Foundation for Basic Research (№ 16-02-00304), Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research (№ 16-42-240435, and 16-42-243057) and the grant of the President of the Russian Federation (Project MK-1398.2017.2)

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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.; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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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

Материалы конференции

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

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

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.
}
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    Dudarev, A. V.
    Lang-Firsov transformation in the generalized tight-binding method / A. V. Dudarev, E. I. Shneyder // J. Sib. Fed. Univ. Math. Phys. - 2023. - Vol. 16, Is. 6. - P780-785 ; Журн. СФУ. Матем. и физ. - Cited References: 9 . - ISSN 1997-1397. - ISSN 2313-6022
   Перевод заглавия: Преобразование Ланга-Фирсова в обобщенном методе сильной связи
Кл.слова (ненормированные):
Lang–Firsov transformation -- polaron and bipolaron crossover -- pd-model -- преобразование Ланга и Фирсова -- кроссовер поляронов и биполяронов -- pd-модель
Аннотация: The effects of strong electron-phonon interaction in a realistic model of a system with strong Coulomb correlations are analyzed using the Lang and Firsov transformation. It is shown that polaronic and bipolaronic transformations, widely discussed in the literature and associated with a smooth or sharp transitions in the properties of charge carriers when the strength of the electron-phonon coupling changes, determine the switching of the system between the regimes of correlated carriers, polarons or bipolarons. These transitions are controlled by the local electron-phonon interaction of the Holstein type. At the same time, the non local electron-lattice contribution associated with the modulation of the hopping integral plays a major role in the crossover of the polaron and bipolaron regimes in the limit of strong electron correlations.
В настоящей работе с помощью преобразования Ланга и Фирсова анализируются эффекты сильного электрон-фононного взаимодействия в реалистичной модели системы с сильными кулоновскими корреляциями. Показано, что широко обсуждаемые в литературе поляронные и биполяронные трансформации, связанные с плавным или резким изменением свойств носителей заряда при изменении силы электрон-фононной связи, определяют переключение системы между режимами коррелированных носителей, поляронов или биполяронов. При этом существенную роль в кроссовере поляронного и биполяронного режимов в пределе сильных электронных корреляций играет нелокальный электрон-фононный вклад, связанный с модуляцией интеграла перескока между различными орбиталями.

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Держатели документа:
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна

}
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Influence of triplet states on the spectrum of collective spin-polaron excitations in a 2D kondo lattice / V. V. Val'kov [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 10. - P. 1997-2000, DOI 10.1134/S1063783411100337. - Cited References: 10. - This study was supported by the Presidium of the Russian Academy of Sciences (Program "Quantum Physics of Condensed Matter"), the Siberian Branch of the Russian Academy of Sciences (Interdisciplinary Integration project no. 53), the Ministry of Education and Science of the Russian Federation (Russian Federal Targeted Program "Scientific and Scientific-Pedagogical Personnel of the Innovative Russia" in 2009-2013), and the Russian Foundation for Basic Research (projects nos. 09-02-00127, 10-02-00614). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SUPERCONDUCTIVITY
ANTIFERROMAGNET
Аннотация: The normal and superconducting phases of the ensemble of spin polarons in a two-dimensional Kondo lattice have been considered under the conditions when the hopping integral is comparable to the s-d exchange interaction energy. The polaron excitation spectrum and the superconducting transition temperature have been found taking into account upper triplet states. The change in the concentration dependence of the critical temperature of the transition to the superconducting phase with the relation between the hopping integral and the integral of the s-d exchange coupling has been analyzed.

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Держатели документа:
[Val'kov, V. V.
Shklyaev, A. A.
Korovushkin, M. M.] Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Barabanov, A. F.] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142092, Moscow Oblast, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk 660014, Russian Federation
Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow oblast 142092, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Shklyaev, A. A.; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.
}
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Kagan, M. Y.
Anomalous resistivity and the electron-polaron effect in the two-band hubbard model with one narrow band / M. Y. Kagan, V. V. Val'kov // J. Supercond. Nov. Magn. - 2012. - Vol. 25, Is. 5. - P. 1379-1382, DOI 10.1007/s10948-012-1523-3. - Cited References: 28. - We are grateful to P. Fulde, Yu. Kagan, K. I. Kugel, N.V. Prokof'ev, P. Nozieres, and C. M. Varma for the numerous stimulating discussions. We acknowledge financial support of the RFBR Grant No. 11-02-00741. . - ISSN 1557-1939

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
FERMI GAS
   SUPERCONDUCTIVITY
   SUPERFLUIDITY
   TEMPERATURE
   REPULSION
   SYSTEMS
Кл.слова (ненормированные):
Electron-polaron effect -- Two-band Hubbard model -- Marginality -- Anomalous resistivity
Аннотация: We search for anomalous normal and superconductive behavior in the two-band Hubbard model with one narrow band. We analyze the influence of the electron–polaron effect and the Altshuler–Aronov effect on effective mass enhancement and scattering times of heavy and light components in the clean case. We find anomalous behavior of resistivity at high temperatures T>W∗hT > W_{h}^{*} both in 3D and 2D situations. The SC instability in the model is governed by an enhanced Kohn–Luttinger effect for p-wave pairing of heavy electrons via polarization of light electrons.

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Держатели документа:
[Kagan, M. Y.] PL Kapitza Inst Phys Problems, Moscow 119334, Russia
[Val'kov, V. V.] Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
P.L. Kapitza Institute for Physical Problems, Kosygina st. 2, 119334 Moscow, Russian Federation
Kirenskii Institute of Physics, Akademgorodok 50, Building 38, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Каган, Максим Юрьевич
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10.

Kozlov, P. A.
Transition Between Large and Small Polaron States in the Electronic Structure of HTSC Cuprates / P. A. Kozlov, 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. P2.11. - P. 153. - References: 3 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
cuprates -- strong electron correlations -- electron-phonon interaction -- polaron -- Franck-Condon

Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Козлов, Пётр Александрович; 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.

Magnon-polaron excitations in the noncollinear antiferromagnet Mn3Ge / A. S. Sukhanov [et al.] // Phys. Rev. B. - 2019. - Vol. 99, Is. 21. - Ст. 214445, DOI 10.1103/PhysRevB.99.214445. - Cited References: 53. - We thank S. E. Nikitin for many stimulating discussions. A.S.S. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). Work at the TU Dresden was funded by the German Research Foundation (DFG) through projects B05 and C03 of the Collaborative Research Center SFB 1143 (project i.d. 247310070), Wurzburg-Dresden Cluster of Excellence ct.qmat (EXC 2147; project i.d. 39085490), and Priority Program SPP 2137 "Skyrmionics." . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics,
Рубрики:
TRIANGULAR SPIN CONFIGURATION
WEAK FERROMAGNETISM
MN3SN
Аннотация: We present detailed inelastic neutron scattering measurements of the noncollinear antiferromagnet Mn3Ge. Time-of-flight and triple-axis spectroscopy experiments were conducted at the temperature of 6 K, well below the high magnetic ordering temperature of 370 K. The magnetic excitations have a 5-meV gap and display an anisotropic dispersive mode reaching ~ 90 meV at the boundaries of the magnetic Brillouin zone. The spectrum at the zone center shows two additional excitations that demonstrate characteristics of both magnons and phonons. Ab initio lattice-dynamics calculations show that these can be associated with the magnon-polaron modes resulting from the hybridization of the spin fluctuations and the low-energy optical phonons. The observed magnetoelastic coupling agrees with the previously found negative thermal expansion in this compound and resembles the features reported in the spectroscopic studies of other antiferromagnets with similar noncollinear spin structures.

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Держатели документа:
Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany.
Tech Univ Dresden, Inst Festkorper & Mat Phys, D-01069 Dresden, Germany.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Univ Paris Saclay, CEA Saclay, CNRS, Lab Leon Brillouin,CEA, F-91191 Gif Sur Yvette, France.
Rutherford Appleton Lab, STFC, ISIS Facil, Didcot OX11 0QX, Oxon, England.

Доп.точки доступа:
Sukhanov, A. S.; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Bourges, P.h.; Walker, H. C.; Manna, K.; Felser, C.; Inosov, D. S.; International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM); German Research Foundation (DFG) through project B05 of the Collaborative Research Center [SFB 1143, 247310070]; German Research Foundation (DFG) through project C03 of the Collaborative Research Center [SFB 1143, 247310070]; German Research Foundation (DFG) through Wurzburg-Dresden Cluster of Excellence ct.qmat [EXC 2147, 39085490]; German Research Foundation (DFG) [SPP 2137]
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12.

    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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13.

Mitskan, V. A.
Implementation of the concept of spin polaron in cuprate superconductors within the diagram technique / V. A. Mitskan, M. M. Korovushkin, D. M. Dzebisashvili // JETP Letters. - 2021. - Vol. 114, Is. 5. - P. 289-295, DOI 10.1134/S0021364021170094. - Cited References: 43. - This work was supported by the Russian Foundation for Basic Research, project nos. 18-02-00837 and 20-32-70059 . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRONIC-STRUCTURE
ELEMENTARY EXCITATIONS
QUASI-PARTICLES
Аннотация: The spectral properties of an ensemble of spin-polaron quasiparticles have been studied within the spin–fermion model of cuprate superconductors using the method combining the Feynman diagram technique and the diagram technique for spin operators. It has been shown that strong spin–charge coupling results in the formation of the lower spin-polaron band separated by a wide energy gap from the band of bare holes. It has been shown that the spin-polaron band has a local minimum near the (π/2, π/2) point of the Brillouin zone. A class of diagrams for the self-energy part that have a fundamental significance for the description of the main features of the spin-polaron spectrum has been determined.

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Публикация на русском языке Мицкан, Виталий Александрович. Реализация концепции спинового полярона в купратных сверхпроводниках на основе диаграммной техники [Текст] / В. А. Мицкан, М. М. Коровушкин, Д. М. Дзебисашвили // Письма в ЖЭТФ. - 2021. - Т. 114 Вып. 5. - С. 339-345

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Мицкан, Виталий Александрович
}
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14.

Orlov, Yu. S.
Polaron model of a pseudogap state in quasi-one-dimensional systems / Y. S. Orlov, V. A. Dudnikov // J. Exp. Theor. Phys. - 2017. - Vol. 125, Is. 5. - P. 798-809, DOI 10.1134/S1063776117110103. - Cited References: 57. - This work was supported by the Russian Foundation for Basic Research (project nos. 17-02-00826, 16-02-00507, 16-02-00098, and 16-02-00273), by the Government of the Krasnoyarsk krai, by the Kras-noyarsk Regional Foundation for Supporting Scientific and Technological Activity (project nos. 16-42-243048, 16-42-240746, and 16-43-240505)), and by the Grants Council of the President of the Russian Federation (project nos. SP-1844.2016.1 and NSh-7559.2016.2). . - ISSN 1063-7761
Кл.слова (ненормированные):
Basic concepts -- Cluster perturbation theories -- Polaron models -- Pseudogap state -- Quasi-one dimensional -- Quasi-one-dimensional systems
Аннотация: A brief overview of the basic concepts and problems of the physics of quasi-one-dimensional (q1D) compounds is given. A consistent theoretical description of the nature of the so-called pseudogap state still remains the main problem. A simplified model of the pseudogap state based on the formation of smallradius polarons is considered within the cluster perturbation theory.

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Публикация на русском языке Орлов, Юрий Сергеевич. Поляронная модель псевдощелевого состояния в квазиодномерных системах [Текст] / Ю. С. Орлов, В. А. Дудников // Журн. эксперим. и теор. физ. - 2017. - Т. 152 Вып. 5. - С. 944-956

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Орлов, Юрий Сергеевич
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15.

Ovchinnikov, S. G.
Electronic structure and its evolution with doping in cuprates with account for strong electron correlations / S. G. Ovchinnikov, V. A. Gavrichkov, M. M. Korshunov // Physica B. - 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P. 1168-1170, DOI 10.1016/j.physb.2005.01.311. - Cited References: 4 . - ISSN 0921-4526

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
strong electron correlations -- multiband p-d model -- spin-polaron effect
Аннотация: The electronic structure of the undoped and p- and n-type doped cuprates is studied in the framework of the multiband p-d model using the generalized tight binding method. With hole doping, an unusual in-gap state appears just at the top of the valence band with the spectral weight proportional to the doping concentration. The chemical potential dependence on the hole and electron concentration is asymmetrical and in good agreement with the experimental data. The in-gap bands have spin-polaron origin and the spectral function of this band has a form of small low-energy satellite that can be detected in ARPES measurements. (c) 2005 Elsevier B.V. All rights reserved.

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

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Korshunov, M. M.; Коршунов, Максим Михайлович; Овчинников, Сергей Геннадьевич
}
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16.

Ovchinnikov, S. G.
Multiphonon contribution to the polaron formation in cuprates with strong electron correlations and strong electron-phonon interaction / S. G. Ovchinnikov, I. A. Makarov, P. A. Kozlov // Proceedings of SPIE - The International Society for Optical Engineering : SPIE, 2017. - Vol. 10105, DOI 10.1117/12.2266799. - Cited References: 17. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support.
Кл.слова (ненормированные):
High-temperature superconductivity -- Cuprates -- Strong electronic correlations -- Cluster form of perturbation theory -- Hubbard operator -- Three-band p-d model -- Electron-phonon interaction -- Polaron -- Franck-Condon broadening
Аннотация: In this work dependences of the electron band structure and spectral function in the HTSC cuprates on magnitude of electron-phonon interaction (EPI) and temperature are investigated. We use three-band p-d model with diagonal and offdiagonal EPI with breathing and buckling phonon mode in the frameworks of polaronic version of the generalized tight binding (GTB) method. The polaronic quasiparticle excitation in the system with EPI within this approach is formed by a hybridization of the local multiphonon Franck-Condon excitations with lower and upper Hubbard bands. Increasing EPI leads to transfer of spectral weight to high-energy multiphonon excitations and broadening of the spectral function. Temperature effects are taken into account by occupation numbers of local excited polaronic states and variations in the magnitude of spin-spin correlation functions. Increasing the temperature results in band structure reconstruction, spectral weight redistribution, broadening of the spectral function peak at the top of the valence band and the decreasing of the peak intensity. The effect of EPI with two phonon modes on the polaron spectral function is discussed. © 2017 SPIE.

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Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Kozlov, P. A.; Козлов, Пётр Александрович; Овчинников, Сергей Геннадьевич; Oxide-Based Materials and Devices(8 ; 2017 ; 29 Jan. - 1 Feb.)
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17.

Ovchinnikov, S. G.
Temperature evolution of spin-polaron in-gap states in undoped antiferromagnetic cuprates / S. G. Ovchinnikov, M. M. Korshunov, E. V. Zakharova // Phys. Solid State. - 2008. - Vol. 50, Is. 8. - P. 1401-1406, DOI 10.1134/S1063783408080027. - Cited References: 26. - This work was supported by the Russian Foundation for Basic Research (project nos. 06-02-16100 and 0602- 90537-BNTS), the Presidium of the Russian Academy of Sciences (program "Quantum Macrophysics"), and INTAS (YS grant no. 05-109-4891). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
J MODEL
   LA2-XSRXCUO4
   SUPERCONDUCTORS
   BAND
Аннотация: The temperature evolution of in-gap states created by the spin polaron effect and located within the gap with charge transfer between the valence and conduction bands is studied for the case of strong electron correlations using the t-t'-t ''-J model of antiferromagnetic undoped cuprates. The effect of temperature is taken into account by temperature renormalization of the magnon concentration, which is calculated using the Heisenberg model with inclusion of weak interlayer exchange and weak in-plane spin anisotropy, and by introducing a Lorentzian with a temperature-dependent half-width in the form corresponding to the marginal Fermi liquid model. With increasing temperature, the spectral weight of the in-gap state, which is proportional to the magnon concentration, grows leading to an increased intensity of the corresponding peak of the spectral function in all points of the Brillouin zone. At points (pi/2, pi/2) and (pi, 0), the main peak is approached by the satellite peak related to the in-gap band and, at points (0, 0) and (pi, pi), the peaks move away from each other.

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Температурная зависимость спин-поляронных внутрищелевых состояний в недопированных антиферромагнитных купратах [Текст] / С. Г. Овчинников, М. М. Коршунов, Е. В. Захарова // Физ. тверд. тела. - 2008. - Т. 50 Вып. 8. - С. 1349-1354

Держатели документа:
[Ovchinnikov, S. G.
Korshunov, M. M.
Zakharova, E. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
[Korshunov, M. M.] Max Planck Inst Phys Komplexen Syst, D-01187 Dresden, Germany
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Max-Planck Institut fur Physik Komplexen Systeme, Dresden D-01187, Germany

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Zakharova, E. V.; Овчинников, Сергей Геннадьевич
}
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18.

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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19.

Polaron in-gap states in CMR manganites / Gavrichkov V.A., Ovchinnikov S.G. // Moscow Int. Symp. on Magnet. (MISM-2008) : 2008, June 20-25 : book of abstracts. - 2008. - Ст. 24PO-7-15. - P. 630. - Библиогр.: 1

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Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Moscow International Symposium on Magnetism(4 ; 2008 ; Jun. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
}
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20.

    Polaron transformations in the realistic model of the strongly correlated electron system / E. I. Shneyder, S. V. Nikolaev, M. V. Zotova [et al.] // Phys. Rev. B. - 2020. - Vol. 101, Is. 23. - Ст. 235114, DOI 10.1103/PhysRevB.101.235114. - Cited References: 69. - We acknowledge the stimulating discussions with V. A. Gavrichkov, G. Seibold, and K. I. Kugel. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project "Features of electron-phonon coupling in high-temperature superconductors with strong electronic correlations" No. 18-42-240017 and project "Electronic correlation effects and multiorbital physics in iron-based materials and cuprates" No. 19-42240007. . - ISSN 2469-9950. - ISSN 2469-9969
   Перевод заглавия: Поляронные трансформации в реалистичной модели системы с сильными электронными корреляциями

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
ANOMALOUS-DISPERSION
   PHONON INTERACTION
   PHASE-TRANSITIONS
   LO PHONONS
Аннотация: Electron-phonon coupling, diagonal in a real space formulation, leads to a polaron paradigm of smoothly varying properties. However, fundamental changes, namely the singular behavior of polarons, occur if off-diagonal pairing is involved into consideration. The study of polaron transformations and related properties of matter is of particular interest for realistic models, since competition between diagonal and off-diagonal electron-phonon contributions in the presence of other strong interactions can result in unconventional behavior of the system. Here we consider a two-dimensional multiband pd model of cuprate superconductors with electron-phonon interaction and analyze the features of the systems that are caused by the competition of diagonal and off-diagonal electron-phonon contributions in the limit of strong electron correlations. Using the polaronic version of the generalized tight-binding method, we describe the evolution of the band structure, Fermi surface, density of states at Fermi level, and phonon spectral function in the space of electron-phonon parameters ranging from weak to strong coupling strength of the adiabatic limit. On the phase diagram of polaron properties we reveal two quantum phase transitions and show how electron-phonon interaction gives rise to Fermi surface transformation (i) from hole pockets to true Fermi arcs and (ii) from hole to electron type of conductivity. We also demonstrate the emergence of new states in the phonon spectral function of the polaron and discuss their origin.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Nikolaev, S. V.; Николаев, Сергей Викторович; Zotova, M. V.; Зотова, Мария Владимировна; Kaldin, R. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [18-42-240017, 19-42240007]
}
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