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Anomalous spectral properties of strongly correlated systems within the cluster perturbation theory / V. I. Kuz'min, S. V. Nikolaev, S. G. Ovchinnikov // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст. I.P9. - P. 151-152. - Cited References: 4. - The reported study was funded by Russian Foundation for Basic Research (RFBR) according to the research project no. 18-32-00256, RFBR and Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project: “18-42-240017 Features of electron-phonon coupling in high-temperature superconductors with strong electron correlations” and the research project: “18-42-243004 New thermoelectric materials based on multi-scale spatially inhomogeneous substituted rare-earth cobalt oxides and the Ruddlesden-Popper phases” . - ISBN 978-5-9500855-7-4

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

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
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Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model [Preprint] / V. I. Kuz'min, M. A. Visotin, S. V. Nikolaev, S. G. Ovchinnikov. - Electronic text data // ArXiv. - 2020. - Ст. 2001.05143. - Cited References: 86. - The reported study was funded by RFBR according to the research project No. 18-32-00256 (all the results concerning the influence of short-range correlations on the electronic spectral properties). The reported study was also funded by Russian Foundation for Basic Research and Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects “Electronic correlation effects and multiorbital physics in iron-based materials and cuprates” number 19-42-240007, and “Features of electron-phonon coupling in high-temperature superconductors with strong electron correlations” number 18-42-240017
Рубрики:
Strongly Correlated Electrons
Аннотация: Cluster perturbation theory is applied to the two-dimensional Hubbard t−t′−t′′−U model to obtain doping and temperature dependent electronic spectral function with 4×4 and 12-site clusters. It is shown that evolution of the pseudogap and electronic dispersion with doping and temperature is similar and in both cases it is significantly influenced by spin-spin short-range correlations. When short-range magnetic order is weakened by doping or temperature and Hubbard-I like electronic dispersion becomes more pronounced, the Fermi arc turns into large Fermi surface and the pseudogap closes. It is demonstrated how static spin correlations impact the overall dispersion's shape and how accounting for dynamic contributions leads to momentum-dependent spectral weight at the Fermi surface and broadening effects.

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

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

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

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

Доп.точки доступа:
Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Visotin, M. A.; Высотин, Максим Александрович; Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; RFBRRussian Foundation for Basic Research (RFBR) [18-32-00256, 18-32-01062]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [19-42-240007, 18-42-240017]
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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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Effect of interatomic exchange interaction on spin crossover and Mott-Hubbard transition under high pressure and the physical properties of the low Earth’s mantle : Invited / S. G. Ovchinnikov [et al.] // International workshop on actual problems of condensed matter physics : Program. Book of abstracts / Fed. Res. Center KSC SB RAS, Kirensky Inst. of phys., Sib. Fed. Univ. - Krasnoyarsk, 2017. - P. 26

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Доп.точки доступа:
Ovchinnikov, S. G. \предс. прогр. ком.\; Овчинников, Сергей Геннадьевич; Ovchinnikov, S. G.; Orlov, Yu. S.; Nikolaev, S. V.; Николаев, Сергей Викторович; Nesterov, A.; Ovchinnikova, T.; Federal Research Center KSC SB RAS; Kirensky Institute of Physics; Siberian Federal Univercity; International Workshop on Actual Problems of Condensed Matter Physics(27 Mar. - 1 Apr. 2017 ; Krasnoyarsk / Cheremushki)
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Effect of the electron-phonon interaction on the formation of the exciton phase in strongly correlated systems with the spin crossover / Yu. S. Orlov, S. V. Nikolaev, V. I. Kuz'min, S. G. Ovchinnikov // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. H : Magnetism of strongly correlated electron systems. - Ст. H.P15. - P. 104-105. - Cited References: 4. - The study was supported by the Russian Scientiʅc Foundation, the Krasnoyarsk Regional Fund of Science, grant No. 22-22-20007 . - ISBN 978-5-94469-051-7

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

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Российская академия наук; Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Euro-Asian Symposium "Trends in MAGnetism"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
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Effect of the interatomic exchange interaction on the magnetic phase transitions in spin crossover systems under high-pressure / S. G. Ovchinnikov [et al.] // Phys. Solid State. - 2018. - Vol. 60, Is. 6. - P. 1177-1179, DOI 10.1134/S1063783418060276. - Cited References: 5. - This study was supported by the Russian Foundation for Basic Research, Government of the Kras-noyarsk Territory, and Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, projects nos. 16-42-243048 and 16-42-240413, the Grant Council of the President of the Russian Federation, project no. SP-1844.2016.1, and the Russian Foundation for Basic Research, projects nos. 16-02-00507, 16-02-00273, and 18-02-00453. . - ISSN 1063-7834
Аннотация: The phase diagram of an antiferromagnet with the spin crossover from the high-spin to low-spin state with S = 0 with increasing external pressure has been calculated with regard to the pressure dependence of the exchange integral. The calculated results are compared with the experimental data on ferropericlase Fe x Mg1 – xO.

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Публикация на русском языке Влияние межатомного обменного взаимодействия на магнитные фазовые переходы в условиях спинового кроссовера при высоких давлениях [Текст] / С. Г. Овчинников [и др.] // Физ. тверд. тела. - 2018. - Т. 60 Вып. 6. - С. 1166-1168

Держатели документа:
Siberian Federal University, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Department of Physics, Guadalajara University, Guadalajara, Mexico
Sukachev Institute of Forest, Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Nesterov, A. I.; Ovchinnikova, T. M.
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    Effects of electron-phonon interaction in strongly correlated copper oxides systems within alternative versions of generalized tight-binding method / E. I. Shneyder [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. O2.1. - P. 135. - References: 3. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support . - ISBN 978-5-904603-06-9
   Перевод заглавия: Эффекты электрон-фононного взаимодействия в медных оксидах с сильными электронными корреляциями в рамках альтернативных версий обобщенного метода сильной связи
Кл.слова (ненормированные):
electron-phonon interaction -- strongly correlated electron systems

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Makarov, I. A.; Макаров, Илья Анатольевич; Zotova, M. V.; Зотова, Мария Владимировна; Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; 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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10.

Exchange interaction between the high spin Co3+ states in LaCoO3 / Y. S. Orlov, S. V. Nikolaev, V. A. Gavrichkov, S. G. Ovchinnikov // Comput. Mater. Sci. - 2022. - Vol. 204. - Ст. 111134, DOI 10.1016/j.commatsci.2021.111134. - Cited References: 59. - We are thankful to the Russian Science Foundation, Russia for the financial support under the project 18-12-00022 . - ISSN 0927-0256
Кл.слова (ненормированные):
Exchange interaction -- Spin-orbital interaction -- Magnetic phase diagram -- Antiferromagnetism -- Ferromagnetism -- Hubbard model
Аннотация: The formation of the exchange interaction between HS Co3+ ions, which are excited in LaCoO3, is studied within the multielectron approach. Two main contributions appear to be antiferromagnetic (AFM) and ferromagnetic (FM). When the ground state is LS, the total interaction is AFM. The crossover to the HS state may result in the FM ordering. The mean-field magnetic phase diagrams on the plane spin gap-temperature have been calculated without and with spin-orbital interaction in the HS term. Without spin-orbital interaction the reentrant magnetic order is possible. The spin-orbital coupling removes the reentrant phase transition and stabilizes the LS state. For known from experimental data values of the spin gap and exchange interaction, the ideal stoichiometric LaCoO3 is very close to the LS–HS crossover and magnetic ordering border. The violations of local coordination and symmetry of the Co3+-oxygen complexes that take place in the intergrain boundaries, at the surface of single crystals, and in the thin films on the strained substrate, may result in the formation of the HS state and FM order for such materials.

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

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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11.

Exciton Phase in Strongly Correlated Systems with the Spin Crossover / Yu. S. Orlov, S. V. Nikolaev, V. A. Dudnikov, S. G. Ovchinnikov // International conference "Functional materials" : book of abstracts / ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P. 40. - Библиогр.: 3 назв. - The authors thank the Russian Scientific Foundation for the financial support under the grant 18-12-00022.

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Доп.точки доступа:
Berzhansky, V. N. \ed.\; Бержанский, Владимир Наумович; Ovchinnikov, S. G. \org. com.\; Овчинников, Сергей Геннадьевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Ovchinnikov, S. G.; "Functional materials", International conference(2021 ; Oct. 4-8 ; Alushta, Russia); Крымский федеральный университет имени В.И. Вернадского
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12.

Excitonic ordering in strongly correlated spin crossover systems: Induced magnetism and excitonic excitation spectrum / Yu. S. Orlov, S. V. Nikolaev, V. I. Kuz'min [et al.] // Phys. Rev. B. - 2022. - Vol. 106, Is. 23. - Ст. 235120, DOI 10.1103/PhysRevB.106.235120. - Cited References: 50. - The authors thank the Russian Scientific Foundation for financial support under Grant No.18-12-00022 . - ISSN 2469-9950. - ISSN 2469-9969
Аннотация: The effects associated with interatomic hoppings of excitons and the excitonic Bose condensate formation in strongly correlated spin crossover systems are considered in the framework of the effective Hamiltonian for the two-band Kanamori model. The appearance of antiferromagnetic ordering due to the exciton order is found even in the absence of interatomic exchange interaction. The spectrum of excitonic excitations is calculated at various points of the temperature vs crystal field phase diagram. Outside the region of exciton ordering, the spectrum has a gap, which vanishes at the boundary of the exciton condensate phase. The nonuniform spectral weight distribution over the Brillouin zone is found. The role of electron-phonon interaction is discussed as well.

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

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Zarubin, A. E.; Зарубин, А. Е.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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13.

Features of spin crossovers in magnetic materials / Yu. S. Orlov, S. V. Nikolaev, V. A. Dudnikov [et al.] // Phys. Usp. - 2023. - Vol. 66, Is. 7. - P. 647-672, DOI 10.3367/UFNe.2022.05.039195. - Cited References: 237. - The authors thank the Russian Science Foundation for financial support in the framework of project no. 18-12-00022 . - ISSN 1063-7869. - ISSN 1468-4780
Кл.слова (ненормированные):
spin crossovers -- exchange interaction -- Bose condensationl -- spin excitons -- transition metal oxides -- rare earth cobaltites -- strong electron correlations -- antiferromagnetism -- ferromagnetism -- metal–insulator transition -- Earth's mantle -- Hubbard model
Аннотация: We present experimental and theoetical results of spin crossover studies in magnetically ordered materials. The effect of spin crossovers on the electronic structure of transition metal oxides and on the Bose condensation of spin excitons in the vicinity of the spin crossover is considered. A new method for calculating the interatomic superexchange interaction in transition metal oxides is discussed that allows considering selective contributions of excited magnetic cation terms. Changes in the exchange interaction sign are predicted for spin crossovers for d5—d7 ions. In the RCoO3 family of rare-earth cobaltites, the ground state is nonmagnetic, but, as the temperature increases, thermal excitations of high-spin states give rise to a number of experimentally detectable features. In defective RCoO3 samples, stabilization of the high-spin term and ferromagnetic ordering are possible. Dynamical crossovers under external pumping and the dynamics of multiplicity, magnetization, and local lattice distortions are discussed. Geophysical implications of spin crossovers are considered, and metallic properties of Earth's mantle at a depth of 1400—1800 km are predicted.

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Публикация на русском языке Особенности спиновых кроссоверов в магнитных материалах [Текст] / Ю. С. Орлов, С. В. Николаев, В. А. Дудников [и др.] // Успехи физ. наук. - 2023. - Т. 193 № 7. - С. 689–716

Держатели документа:
Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Academgorodok 50, str. 38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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14.

Forming a dielectric exciton phase in strongly correlated systems with spin crossover / Y. S. Orlov, S. V. Nikolaev, V. A. Dudnikov, S. G. Ovchinnikov // Phys. Rev. B. - 2021. - Vol. 104, Is. 19. - Ст. 195103, DOI 10.1103/PhysRevB.104.195103. - Cited References: 46. - The authors thank the Russian Scientific Foundation for financial support under Grant No. 18-12-00022 . - ISSN 2469-9950
Кл.слова (ненормированные):
Antiferromagnetism -- Electronic structure -- Hamiltonians -- Antiferromagnetic orderings -- Effective Hamiltonian -- Electronic.structure -- High pressure -- High spins -- Spin crossovers -- Strong electron correlations -- Strongly correlated systems -- Two bands -- Two-band Hubbard model -- Excitons
Аннотация: Formation of the magnetic structure and exciton condensate of local magnetic excitons in strongly correlated systems near the spin crossover under high pressure is considered in terms of the effective Hamiltonian obtained from a two-band Hubbard model in the regime of strong electron correlations. The coexistence of the long-range antiferromagnetic order and exciton condensate and the occurrence of the magnetization caused by the condensation of local magnetic excitons are demonstrated. Transformation of the electronic structure of the antiferromagnetic high-spin insulator into the paramagnetic two-band correlated metal via a narrow-gap antiferromagnetic excitonic semiconductor is obtained.

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Держатели документа:
Institute of Engineering and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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15.

Influence of canted antife rromagnetic order on the electronic spectral function in 2d strongly correlated electronic systems / V.I Kuz'min, S. V. Nikolaev, S. G. Ovchinnikov // Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 3PO-I-21. - P. 578

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Доп.точки доступа:
Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
Нет сведений об экземплярах (Источник в БД не найден)
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16.

Korshunov, M. M.
Cluster perturbation approach to iron-based superconductors / M. M. Korshunov, S. V. Nikolaev, Yu. N. Togushova // Quant. in Complex Matter: Supercond., Magnet. and Ferroelectr. : book of abstracts / ed. A. Bianconi. - Rome, 2016. - P. 148. - References: 8. - This work was partially supported by the RFBR (grant 16-02-00098) . - ISBN 978-88-6683-055-9

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Доп.точки доступа:
Bianconi, A. \ed.\; Nikolaev, S. V.; Николаев, Сергей Викторович; Togushova, Yu. N.; Тогушова, Ю. Н.; Коршунов, Максим Михайлович; Quantum in Complex Matter: Superconductivity, Magnetism and Ferroelectricity, International conference(20 ; 2016 ; Jun. ; 23-29 ; Ischia, Italy)
}
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17.

Kudashkin, K.
Spectral properties of the Bose-Hubbard model within the cluster perturbation theory in X-operators representation / K. Kudashkin, S. Nikolaev, S. Ovchinnikov // J. Supercond. Nov. Magn. - 2017. - Vol. 30, Is. 1. - P. 103-107, DOI 10.1007/s10948-016-3781-y. - Cited References:16. - This work was supported by RFBR grant 16-02-00098, Government of Krasnoyarsk Territory and RFBR according to the research projects 16-42-243048, 16-42-240511, and 16-42-240769, and the Russian President Grant NSh-7559.2016.2. . - ISSN 1557-1939. - ISSN 1557-1947

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
TRANSITION
   SUPERFLUID
   INSULATOR
   ATOMS
Кл.слова (ненормированные):
Bose-Hubbard model -- Ultracold gases -- Cluster perturbation theory -- Density of states -- Spectral properties
Аннотация: We study the two-dimensional ultracold Bose gas in optical lattice. We use cluster perturbation theory based on Hubbard X-operators to calculate the spectral function and phase diagram of Bose-Hubbard model which is minimal model to describe behavior of ultracold gases in optical lattices. We have analyzed spectral properties of spinless bosons in a square lattice taking into account the short-range correlation.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; RFBR [16-02-00098, 16-42-243048, 16-42-240511, 16-42-240769]; Government of Krasnoyarsk Territory; Russian President Grant [NSh-7559.2016.2]
}
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18.

Kuz'min, V. I.
Comparison of the electronic structure of the Hubbard and t - J models within the cluster perturbation theory / V. I. Kuz'min, S. V. Nikolaev, S. G. Ovchinnikov // Phys. Rev. B. - 2014. - Vol. 90, Is. 24. - Ст. 245104, DOI 10.1103/PhysRevB.90.245104. - Cited References: 37. - This work is supported by RFBR (Grants No. 13-02-01395-a, No. 14-02-31677-mol-a, and No. 14-02-00186-a), the Ministry of Education and Science of Russia (Government Contract No. 3085, SibFU 2014 GF-2), and a grant of the Russian President (Grant No. NSh-2886.2014.2). . - ISSN 1098-0121. - ISSN 1550-235X

РУБ Physics, Condensed Matter
Рубрики:
FERMION SYSTEMS
SUPERCONDUCTIVITY
METAL
Аннотация: Electronic dispersion and density of states (DOS) have been calculated for the Hubbard model and the t−J and t−J∗ models with three-site correlated hopping by the cluster perturbation theory. We have found a rather strong quantitative difference both in dispersion and DOS at all doping for the Hubbard and t−J models at the energy scale ω≳t. The three-site correlated hopping addition results in an almost negligible difference for the Hubbard and t−J∗ models. Close to the Fermi energy, at the scale ω≲J, the electronic structure of all three models is similar. We have found the line of zeros of the Green function for the t−J model that has been previously obtained for the Hubbard model by cellular dynamical mean-field theory calculations.

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Держатели документа:
SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Кузьмин, Валерий Ипполитович; RFBR [13-02-01395-a, 14-02-31677-mol-a, 14-02-00186-a]; Ministry of Education and Science of Russia [3085, SibFU 2014 GF-2]; [NSh-2886.2014.2]
}
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19.

Kuz'min, V. I.
Comparison of the electronic structure of the Hubbard and t-J models within the cluster perturbation theory / V. I. Kuz’min, S. V. Nikolaev, S. G. Ovchinnikov // Пятая Междунар. конф. "Фундаментал. проблемы высокотемператур. сверхпроводимости" (ФПС’15) : сборник расширенных тезисов. - М. : ФИАН, 2015. - Ст. M7. - С. 58-59

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Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Кузьмин, Валерий Ипполитович; "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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20.

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

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

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

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