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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Nonadiabatic interaction of acoustic phonons with spins S=1/2 in the two-dimensional Heisenberg model
Разночтения заглавия :авие SCOPUS: Nonadiabatic interaction of acoustic phonons with spins S = 1/2 in the two-dimensional heisenberg model
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2003. - Vol. 97, Is. 5. - P969-977. - ISSN 1063-7761, DOI 10.1134/1.1633952
Примечания : Cited References: 18
Предметные рубрики: QUANTUM MONTE-CARLO
EU2CUO4
GD2CUO4
POLARON
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Yakimov L. Y.
Заглавие : The exact spectrum of Fermi quasiparticles in Kondo-Anderson ferromagnetic lattice
Разночтения заглавия :авие SCOPUS: The Exact Spectrum of Fermi Quasiparticles in Kondo-Anderson Ferromagnetic Lattice
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 8. - P1479-1483. - ISSN 1063-7834, DOI 10.1134/1.1602883
Примечания : 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)
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Formation of a spin density wave in copper metaborate by a spin polaron
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2004. - Vol. 16, Is. 32. - P5907-5914. - ISSN 0953-8984, DOI 10.1088/0953-8984/16/32/023
Примечания : Cited References: 12
Предметные рубрики: SOLITON LATTICE
CUB2O4
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Borisov A. A., Gavrichkov V. A., Korshunov M. M.
Заглавие : Prediction of the in-gap states above the top of the valence band in undoped insulating cuprates due to the spin-polaron effect
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2004. - Vol. 16, Is. 8. - PL93-L100. - ISSN 0953-8984, DOI 10.1088/0953-8984/16/8/L04
Примечания : Cited References: 25
Предметные рубрики: ELECTRONIC-STRUCTURE
LA2-XSRXCUO4
MODEL
ANTIFERROMAGNETISM
SPECTRA
OXIDES
Ключевые слова (''Своб.индексиров.''): quasiparticle band structure--spin-polaron effect--antiferromagnetic materials--approximation theory--doping (additives)--electronic structure--hamiltonians--insulation--magnetic fields--strontium compounds--thermal effects--lanthanum compounds
Аннотация: In the framework of the generalized tight binding method we have calculated the quasiparticle band structure and the spectral functions of the undoped cuprates such as La2CuO4, Sr2CUO2Cl2 etc. Due to spin fluctuations the in-gap state appears above the top of the valence band in the undoped antiferromagnetic insulator similar to in-gap states induced by hole doping. In the ARPES experiments the in-gap states can be detected as weak low energy satellites.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Gavrichkov V. A., Korshunov M. M.
Заглавие : Electronic structure and its evolution with doping in cuprates with account for strong electron correlations
Место публикации : Physica B: ELSEVIER SCIENCE BV, 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P1168-1170. - ISSN 0921-4526, DOI 10.1016/j.physb.2005.01.311
Примечания : Cited References: 4
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gavrichkov V. A., Ovchinnikov S. G.
Заглавие : Polaron in-gap states in CMR manganites
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2008): 2008, June 20-25 : book of abstracts. - 2008. - Ст.24PO-7-15. - P.630
Примечания : Библиогр.: 1
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Korshunov M. M., Zakharova E. V.
Заглавие : Temperature evolution of spin-polaron in-gap states in undoped antiferromagnetic cuprates
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 8. - P1401-1406. - ISSN 1063-7834, DOI 10.1134/S1063783408080027
Примечания : 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).
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Shklyaev A. A., Barabanov A. F.
Заглавие : The effect of spin correlations on a superconducting phase of the spin polarons in 2D Kondo lattice
Место публикации : J. Phys. Conf. Ser. - 2010. - Vol. 200, Is. SECTION 1. - ISSN 17426588 (ISSN), DOI 10.1088/1742-6596/200/1/012217
Ключевые слова (''Своб.индексиров.''): antiferromagnets--concentration dependence--cuprates--experimental data--hopping integrals--kondo lattice model--kondo lattices--magnetic correlation--spin correlations--spin polaron--superconducting phase--superconducting phase transitions--temperature dependence--copper compounds--correlators--magnetism--phase diagrams--polarons--superconducting magnets--superconductivity--phase transitions
Аннотация: The effect of the magnetic correlators on the spin polaron superconducting phase is studied in terms of 2D Kondo lattice model. It is shown that hopping integrals are renormalized by the magnetic correlators and as a result the Tc phase diagram is changing significantly. By computation the effect of magnetic correlation functions on the concentration dependence of T c was analysed and their substantial role in description of doped antiferromagnets is demonstrated. The obtained phase diagram is in qualitative agreement with experimental data for temperature dependence of the superconducting phase transition with d-type symmetry in cuprates. © 2010 IOP Publishing Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Shklyaev A. A., Korovushkin M. M., Barabanov A. F.
Заглавие : Influence of triplet states on the spectrum of collective spin-polaron excitations in a 2D kondo lattice
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 10. - P1997-2000. - ISSN 1063-7834, DOI 10.1134/S1063783411100337
Примечания : 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).
Предметные 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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kagan M.Yu., Val'kov V. V.
Заглавие : Anomalous resistivity and the electron-polaron effect in the two- band Hubbard model with one narrow band
Место публикации : arXiv. - 2011. - Ст.1111.3135
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