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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Kuz'min E. V., Ovchinnikov S. G.
Заглавие : Electronic structure and order parameter symmetry in high-temperature superconductors
Место публикации : Uspekhi Fiz. Nauk: MEZHDUNARODNAYA KNIGA, 2000. - Vol. 170, Is. 2. - P.189-192. - ISSN 0042-1294
Примечания : Cited References: 31
Предметные рубрики: CORRELATED ELECTRONS
HUBBARD-MODEL
OXIDES
LA2-XSRXCUO4
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'min E. V., Ovchinnikov S. G., Baklanov I. O.
Заглавие : Comparison of superconductivity in Sr2RuO4 and copper oxides
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2000. - Vol. 61, Is. 22. - P15392-15397. - ISSN 1098-0121, DOI 10.1103/PhysRevB.61.15392
Примечания : Cited References: 21
Предметные рубрики: T-J MODEL
HUBBARD-MODEL
LAYERED PEROVSKITE
ELECTRONS
Аннотация: To compare the superconductivity in strongly correlated electron systems with the antiferrornagnetic fluctuations in the copper oxides and with the ferromagnetic fluctuations in Sr2RuO4 a t-J-l model is proposed. The antiferromagnetic coupling J results in the superconducting state of d(x2-y2) symmetry and the ferromagnetic coupling I results in the spin-triplet p-type state. The difference in the gap anisotropies provides the large difference in T-c values, for the typical values of the coupling constants: T-c similar to 1 K for the ruthenste and T-c similar to 100 K for the cuprates.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'min E. V., Ovchinnikov S. G., Singh D. J.
Заглавие : Effect of frustrations on magnetism in the Ru double perovskite Sr2YRuO6
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2003. - Vol. 68, Is. 2. - Ст.24409. - ISSN 1098-0121, DOI 10.1103/PhysRevB.68.024409
Примечания : Cited References: 24
Предметные рубрики: MOTT TRANSITION
LATTICE
SPIN
ANTIFERROMAGNETISM
SUPERCONDUCTIVITY
FERROMAGNETISM
Аннотация: Localized Ru5+ spins in Sr2YRuO6 form a fcc lattice with an antiferromagnetic (AFM) nearest-neighbor (NN) coupling J approximate to 25 meV and rather low Neel temperature T-N= 26 K. Analysis of the electronic structure of Sr2RuO4 results in the effective Heisenberg model. We have studied the effect of frustrations on the AFM type-I structure of Sr2YRuO6 in the spin-wave approximation. In the model with only NN coupling the AFM state is unstable due to frustrations, and T-N = 0. Stabilization of the AFM state occurs due to the next-nearest-neighbor coupling I or due to the magnetic anisotropy D. Very small values D/J similar to I/J less than or equal to 10(-3) are enough to obtain the experimental values of T-N and sublattice magnetization m = 1.85 mu(B) /Ru (62% from the nominal S = 3/2 value).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'min E. V., Ovchinnikov S. G., Singh D. J.
Заглавие : Frustrated antiferromagnetism in the Sr2YRuO6 double perovskite
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2003. - Vol. 96, Is. 6. - P1124-1130. - ISSN 1063-7761, DOI 10.1134/1.1591224
Примечания : Cited References: 20. - This work was financially supported by the Russian Foundation for Basic Research (project no. 00-02-16110), RFFI-KKFN “Enisei” (project no. 02-02-97705), INTAS (grant 01-0654), and the Quantum Macrophysics Program of the Russian Academy of Sciences.
Предметные рубрики: SPIN-WAVE
HEISENBERG-MODEL
MOTT TRANSITION
Ключевые слова (''Своб.индексиров.''): anisotropy--antiferromagnetism--magnetic moments--perovskite--thermal effects--antiferromagnctic structures--double perovskite--frustrated antiferromagnetism--heisenberg models--strontium compounds
Аннотация: The spins of Ru5+ ions in Sr2YRuO6 form a face-centered cubic lattice with antiferromagnetic nearest neighbor interaction J approximate to 25 meV. The antiferromagnetic structure of the first type experimentally observed below the Neel temperature T-N = 26 K corresponds to four frustrated spins of 12 nearest neighbors. In the Heisenberg model in the spin-wave approximation, the frustrations already cause instability of the antiferromagnetic state at T = 0 K. This state is stabilized by weak anisotropy D or exchange interaction I with the next-nearest neighbors. Low D/J similar to I/J similar to 10(-3) values correspond to the experimental T-N and sublattice magnetic moment values. (C) 2003 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'min E. V.
Заглавие : Quantum spin liquid and antiferromagnetism
Место публикации : Low Temp. Phys. - 2003. - Vol. 29, Is. 7. - P.571-578. - ISSN 1063-777X, DOI 10.1063/1.1596582; \b Физика низких температур
Примечания : Cited References: 9
Аннотация: A spin liquid concept for the Heisenberg Hamiltonian (spin s=1/2) with antiferromagnetic exchange interactions between nearest neighbors is developed. The spin liquid is described by the Green's function method in the framework of a second-order theory. Equations are presented for the self-consistent calculation of the parameters of the system and its thermodynamic properties at all temperatures. A description of the spin system in the sc and bcc lattices is proposed wherein it is treated as a spatially homogeneous spin liquid with a condensate and with a singlet ground state. It is shown that the modulus of the "staggered" magnetization is expressed uniquely in terms of a condensate at a boundary point of the Brillouin zone and is the long-range order parameter. The existence region in temprature of the ordered state of the spin liquid with a condensate (TT-0) is wider than the existence region of the two-sublattice antiferromagnetism (T-0T-N, where T-N is the Neel temperature), while the energy is lower. For TT-0 the system passes into an ordinary spin liquid state. (C) 2003 American Institute of Physics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'min E. V.
Заглавие : Quantum spin liquid in the FCC lattice
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2003. - Vol. 96, Is. 1. - P129-139. - ISSN 1063-7761, DOI 10.1134/1.1545392
Примечания : Cited References: 12
Предметные рубрики: HEISENBERG-ANTIFERROMAGNET
TRANSITION
Ключевые слова (''Своб.индексиров.''): antiferromagnetism--green's function--linear systems--magnetic couplings--quantum theory--thermodynamic properties--antiferromagnetic interactions--green temperature functions--heisenberg model--quantum spin liquid--spin system--spin-wave theory--crystal lattices
Аннотация: The properties of the spin system in the FCC lattice described by the Heisenberg model (s=1/2) with antiferromagnetic interactions between the nearest neighbors were studied. It was shown within the framework of spin-wave theory that long-range antiferromagnetic order was absent because of frustration of exchange coupling and transverse quantum spin fluctuations. The system was in the quantum spin liquid state. A method for describing it within linear second-order theory with self-consistently calculated parameters was suggested. It was proved that the ground spin liquid state was singlet. The thermodynamic properties of the spin liquid in the whole temperature range and the character of spatial spin correlations, which had alternating signs and a finite correlation length, were determined. The theory was constructed based on the method of two-time Green temperature functions. (C) 2003 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'min E. V., Ovchinnikov S. G., Baklanov I. O.
Заглавие : Superconductivity of strongly correlated electrons in copper and ruthenium oxides within the t-J-I model
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 1999. - Vol. 89, Is. 2. - P349-357. - ISSN 1063-7761, DOI 10.1134/1.558991
Примечания : Cited References: 12
Предметные рубрики: LAYERED PEROVSKITE
SR2RUO4
Аннотация: We propose a t-J-I model with direct ferromagnetic exchange I to explain the superconductivity of copper oxides and the ruthenate Sr2RuO4 on the basis of the analysis of the electronic structure of these substances. We analyze the possible p- and d-type superconducting solutions. Solutions of the s type with singlet pairings are impossible in the strong-electron-correlations regime, and p-type solutions correspond to triplet superconductivity and is formed near the ferromagnetic instability threshold in ruthenates. The solution with the d(x)(2)-y(2) symmetry near the antiferromagnetic instability threshold corresponds to copper oxides. We also discuss the reason for the high values of the superconducting transition temperature (T(c)similar to 100 K) in copper oxides and the low values (T(c)similar to 1 K) in ruthenates. (C) 1999 American Institute of Physics. [S1063- 7761(99)02208-8].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'min E. V., Baklanov I. O.
Заглавие : The singlet state in the Hubbard model with U=infinity
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 1998. - Vol. 87, Is. 6. - P1159-1166. - ISSN 1063-7761, DOI 10.1134/1.558607
Примечания : Cited References: 16
Предметные рубрики: HOLES
Аннотация: We discuss, in connection with the problem of the ground state in the Hubbard model with U = infinity, the normal (nonmagnetic) N-state of a system over the entire range of electron concentrations n less than or equal to 1. It is found that in a one-particle approximation, e. g., in the generalized Hartree-Fock approximation, the energy epsilon(0)(n) of the N-state is lower than the energy epsilon(FM)(n) of a saturated ferromagnetic state for all values of n. Using the random phase approximation we calculate the dynamical magnetic susceptibility and show that the N-state is stable for all values of n. A formally exact representation is derived for the mass operator of the one-particle electron Green's function, and its expression in the self-consistent Born approximation is obtained. We discuss the first Born approximation and show that when correlations are taken into account, the attenuation vanishes on the Fermi surface and the electron distribution function at T = 0 acquires a Migdal discontinuity, whose magnitude depends on n. The energy of the N-state in this approximation is still lower than epsilon(FM)(n) for n 1.We show that the spin correlation functions are isotropic, which is a characteristic feature of the singlet states of the system. We calculate the spin correlation function for the nearest neighbors in the zeroth approximation as a function of n. Finally, we conclude that the singlet state of the system in the thermodynamic limit is the ground state. (C) 1998 American Institute of Physics. [S1063-7761(98)01712-0].
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kuz'min E. V., Sikilinda N. G.
Заглавие : To the theory of the spin-wave ferromagnetic resonance in a thin magnetic film
Коллективы : Академия наук СССР, Научный совет по комплексной проблеме "Физика твердого тела" АН СССР, Институт физики им. Л.В. Киренского Сибирского отделения РАН, Иркутский государственный педагогический институт, International colloquium on physics of magnetic films, Международный коллоквиум по физике магнитных пленок
Место публикации : International colloquium on physics of magnetic films: [program and abstracts]/ chairman L. V. Kirensky ; vice-chaiman: V. A. Buravikhin, R. V. Telesnin ; progr. and publ. com. N. M. Salansky ; progr. com.: V. A. Ignatchenko, Yu. V. Zakharov [et al]. - Irkutsk, 1968. - Section Ferromagnetic resonance, spin-wave resonance, high-frequency properties. - Ст.6-A.3. - P.60 (Шифр В37/H99-248389966)
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'min E. V., Ovchinnikov S. G.
Заглавие : Triplet superconductivity in Sr2RuO4 in terms of the t-J-I-model
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1999. - Vol. 41, Is. 11. - P1775-1777. - ISSN 1063-7834, DOI 10.1134/1.1131095
Примечания : Cited References: 13
Предметные рубрики: LAYERED PEROVSKITE
Аннотация: A generalized t-J-I-model is proposed for Sr2RuO4 that takes the strong intra-atomic correlations of the d electrons and the features of the electronic structure of Sr2RuO4 into account. It is shown that, in the limit of strong correlations, there are no singlet s-type solutions for the superconducting state, but triplet solutions exist because of ferromagnetic spin correlations. For typical values of the model parameters, T(c)similar to 1 K, consistent with the value of T-c for Sr2RuO4. (C) 1999 American Institute of Physics. [S1063-7834(99)00511-0].
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