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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : GEKHT R. S.
Заглавие : MAGNETIC-STRUCTURES AND PROPERTIES OF STATES IN STRONGLY FRUSTRATED HEISENBERG ANTIFERROMAGNETS
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1992. - Vol. 102, Is. 6. - P1968-1982. - ISSN 0044-4510
Примечания : Cited References: 23
Предметные рубрики: PHASE-TRANSITIONS
SPIN
LATTICE
MODELS
LONG
Аннотация: The magnetic structures and properties of states in frustrated Heisenberg antiferromagnets are analyzed. It is shown that frustrations induced due to additional spins in the system lead to a large variety of phase with the commensurable and uncommensurable periods and also to arising nonperiodical phases. The energy spectrum of states is studied. It is found that in the large region of the frustration parameter variation the modulated phase (0, Q) is unstable. The phase diagram of states is found and the region of local degeneration for some structures is indicated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edel'man I. S., Khudyakov A. E., Zabluda V. N., Markov V. V., Romanova O. B.
Заглавие : Magnetic ordering of Dy in NiFe-Dy bilayer films
Место публикации : JETP Letters. - 1998. - Vol. 67, Is. 5. - P.339-342. - ISSN 0021-3640, DOI 10.1134/1.567670
Примечания : Cited References: 8
Предметные рубрики: SPIN
Аннотация: The first results of measurements of the temperature and spectral dependences of the circular magnetic dichroism in NiFe-Dy bilayer films are reported. These results show that even at room temperature Dy in such systems is ordered ferromagnetically to a large depth (similar to 600 Angstrom). (C) 1998 American Institute of Physics. [S0021-3640(98)00705-1].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gekht R. S., Bondarenko I. N.
Заглавие : Magnetic ordering and phase transitions in planar antiferromagnetic systems with a Kagome lattice
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 1998. - Vol. 86, Is. 6. - P1209-1215. - ISSN 1063-7761, DOI 10.1134/1.558592
Примечания : Cited References: 23
Предметные рубрики: TRIANGULAR LATTICE
2 DIMENSIONS
SPIN
MODEL
Аннотация: We study the process of magnetic ordering in planar antiferromagnetic systems with a Kagome lattice. It is found that if the interaction between next-nearest-neighbor spins is taken into account, the heat capacity of such systems has a singularity at a finite temperature T. On the basis of a scaling analysis of finite-size systems we study the behavior of thermodynamic quantities in the neighborhood of a phase transition. We find that the phase transition at the critical point is due to discrete- and continuous-symmetry breaking, in which the long-range chiral order and the power-law translational spin order emerge simultaneously. Finally, we calculate the temperatures of the transition to different (with three and nine spins per unit cell) ordered states. (C) 1998 American Institute of Physics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Mankov Y. I., Maradudin A. A.
Заглавие : Wave spectrum of multilayers with finite thicknesses of interfaces
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2000. - Vol. 62, Is. 3. - P2181-2184. - ISSN 0163-1829, DOI 10.1103/PhysRevB.62.2181
Примечания : Cited References: 24
Предметные рубрики: SPIN
EXCITATIONS
MEDIA
Аннотация: To describe a multilayer structure with arbitrary thicknesses of the interfaces between layers, we introduce a model in which the dependence of a material parameter along the axis of such a superlattice is described by a Jacobian elliptic sine function. Depending on the value of the modulus kappa of the elliptic function, the model describes the limiting cases of multilayers with sharp interfaces (kappa=1, d/l=0, where d is the thickness of the interface, l is the period of the superlattice) and of sinusoidal superlattices (kappa=0, d/l=1/4), as Well as all intermediate situations. We investigate the wave spectrum in such a superlattice. The dependences of the widths of the gaps in the spectrum at the boundaries of ail odd Brillouin zones on the ratio d/l are found. It is shown that the thicknesses of the interfaces can be determined if the experimental value of the relation between the widths of the first gap Delta v(1) and any other gap Delta v(n) is known.
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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) : Val'kov V. V., Mitskan V. A., Petrakovskii G. A.
Заглавие : The magnetoelastic mechanism of singlet phase formation in a two-dimensional quantum antiferromagnet
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 102, Is. 2. - P234-247. - ISSN 1063-7761, DOI 10.1134/S106377610602004X
Примечания : Cited References: 18
Предметные рубрики: GROUND-STATE
SPIN
TRANSITION
CUGEO3
MODEL
Ключевые слова (''Своб.индексиров.''): crystal lattices--elasticity--mathematical models--oscillations--phase diagrams--phase transitions--quantum theory--two dimensional--atomic representation--magnetoelastic mechanism--quantum antiferromagnets--singlet phase formation--antiferromagnetic materials
Аннотация: A model describing the second-order phase transition with respect to the magnetoelastic coupling parameter from the anti ferromagnetic (AFM) to the singlet state in a two-dimensional quantum magnet on a square lattice is proposed. The spectrum of elementary excitations in the singlet and AFM phases is calculated using an atomic representation, and the evolution of transverse and longitudinal branches of this spectrum is studied in the vicinity of the transition point. It is established that the AFM to singlet phase transition is related to softening of the longitudinal branch of oscillations. In the singlet phase, the gap plays the role of a parameter characterizing the distance to the phase transition point. It is shown that the spectrum of transverse oscillations in the AFM phase corresponds to the Goldstone boson. Based on an analysis of the stability of the spectrum of elementary excitations, a phase diagram is constructed that determines the regions of the existence of phases with plaquette-deformed lattices.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Ovchinnikov S. G., Balaev A. D., Ivanova N.B., Pashkevich, Yu. G., Michel C.R., Bondarenko G. V.
Заглавие : Magnetic and transport properties of Gd(0.9)A(0.1)CoO(3-delta) (A = Ba, Sr)
Место публикации : J. Magn. Magn. Mater. - 2009. - Vol. 321, Is. 9. - P.1266-1271. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2008.11.087
Примечания : Cited Reference Count: 31. - Гранты: This study was supported by the Rosnauka (Project no. MK-4278.2008.2), Russian Foundation for Basic Research (Project no. 08-02-90708 mob_st) and "Strongly correlated electrons'' program of the Department of Physical Sciences of RAS.Финансирующая организация: Rosnauka [MK-4278.2008.2]; Russian Foundation for Basic Research [08-02-90708 mob_st]; "Strongly correlated electrons'' program of the Department of Physical Sciences of RAS
Предметные рубрики: PEROVSKITE
PR
LA
EU
ND
LN
TRANSITION
SPIN
GD
SM
Ключевые слова (''Своб.индексиров.''): perovskite structure--doped cobaltite--magnetic susceptibility--metal-insulator transition--doped cobaltite--magnetic susceptibility--metal-insulator transition--perovskite structure--antiferromagnetism--barium--cobalt compounds--electric conductivity--ferromagnetic materials--ferromagnetism--gadolinium--magnetic susceptibility--metal insulator boundaries--oxide minerals--paramagnetic materials--perovskite--phase separation--semiconductor insulator boundaries--transport properties--antiferromagnetic--doped cobaltite--doped samples--electrical conductivity measurements--ferromagnetic transitions--insulator-metal transitions--magnetic and transport properties--magnetic behaviors--perovskite structure--temperature ranges--transport datum--x- ray diffractions--metal insulator transition
Аннотация: The X-ray diffraction, magnetization and electrical conductivity measurements for Gd(0.9)A(0.1)CoO(3-delta) (A = Ba, Sr) have been made. The complicated magnetic behavior, including the paramagnetic-ferromagnetic-antiferromagnetic and paramagnetic-ferromagnetic transitions, was found for Ba- and Sr-doped samples. The gradual insulator-metal transitions were observed in a wide temperature range T = 600-800 K. The complex magnetic and transport data could be explained on the basis of the structural phase separation. (C) 2009 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Shauro V. P.
Заглавие : Selective control of the states of multilevel quantum systems using nonselective rotation operators
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 108, Is. 1. - P5-17. - ISSN 1063-7761, DOI 10.1134/S1063776109010026
Примечания : Cited References: 20
Предметные рубрики: FOURIER-TRANSFORM
SPIN
Ключевые слова (''Своб.индексиров.''): quantum electronics--quantum optics--quadrupole nucleus--quantum systems--radio frequencies--rf fields--rf pulse--selective controls--selective pulse--rotation
Аннотация: We have calculated the sequences of nonselective rotation operators separated by intervals of free evolution that perform selective rotations between adjacent levels in systems with three, four, five, and six nonequidistant levels. We have numerically simulated the realization of the calculated sequences for quadrupole nuclei with corresponding spins controlled by intense nonselective radio-frequency (RF) pulses and investigated the dependences of the realization error on the parameters of external and internal interactions. To reduce the error when the RF field is not strong enough, we have found composite nonselective RF pulses consisting of five simple ones. We show that the error of the composite selective rotation operator can be reduced signifi- cantly in comparison to the error of a simple single selective pulse.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shorikov A., Korshunov M. M., Anisimov V. I.
Заглавие : Role of electronic correlations in the Fermi surface formation of Na (x) CoO2
Разночтения заглавия :авие SCOPUS: Role of electronic correlations in the Fermi surface formation of Na xCoO 2
Место публикации : JETP Letters. - 2011. - Vol. 93, Is. 2. - P.80-85. - ISSN 0021-3640, DOI 10.1134/S0021364011020123
Примечания : Cited References: 36. - The authors thank I. Eremin, M. Laad, and S. G. Ovchinnikov for useful discussions. A. S. and V. I. A. acknowledge the support of the Russian Foundation for Basic Research (project nos. 10-02-00046-a, 09-02-00431-a, and 10-02-00546-a), the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project nos. NSh-1941.2008.2 and MK-3758.2010.2), the Presidium of the Russian Academy of Science (programs "Quantum Microphysics of Condensed Matter" N7 and "Strongly Compressed Materials"), and the Russian Federal Agency for Science and Innovations (project no. 02.740.11.0217). M. M. K. acknowledges the support of INTAS (YS Grant no. 05-109-4891); the Russian Foundation for Basic Research (project nos. 09-02-00127, 06-02-16100, and 06-02-90537-BNTS); the Siberian Branch, Russian Academy of Sciences (integration program no. 40); the Presidium of the Russian Academy of Sciences (program no. 5.7); the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-1683.2010.2); and the Ministry of Education and Science of the Russian Federation (project no. R891, federal program "Scientific and Pedagogical Personnel of Innovative Russia for 2009-2013").
Предметные рубрики: DENSITY-FUNCTIONAL CALCULATION
METALS
SPIN
Аннотация: Band structure of metallic sodium cobaltate Na (x) CoO2 (x = 0.33, 0.48, 0.61, 0.72) has been investigated by local density approximation + Hubbard U (LDA+U) method and within Gutzwiller approximation for the Co-t (2g) manifold. Correlation effects being taken into account results in suppression of the e' (g) hole pockets at the Fermi surface in agreement with recent angle-resolved photoemission spectroscopy (ARPES) experiments. In the Gutzwiller approximation the bilayer splitting is significantly reduced due to the correlation effects. The formation of high spin (HS) state in Co d-shell was shown to be very improbable.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shneyder E. I., Ovchinnikov S. G., Shnurenko A. V.
Заглавие : Contribution of the non-Heisenberg ring exchange to the magnetic mechanism of high-Tc superconductivity
Место публикации : JETP Letters. - 2012. - Vol. 95, Is. 4. - P.193-197. - ISSN 0021-3640, DOI 10.1134/S0021364012040078
Примечания : Cited References: 44. - This work was supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. NSh-1044.2012.2), by the Russian Foundation for Basic Research (project no. 12-02-00040), by the Presidium of the Russian Academy of Sciences (program no. 20 "Quantum Mesoscopic and Disordered Systems"), jointly by the Siberian and Ural Branches of the Russian Academy of Sciences, by Siberian Federal University (project no. s/b S-11), and by the Ministry of Education and Science of the Russian Federation (state contract no. P891, federal program "Human Capital"). E.I.Sh. acknowledges the support of the Dynasty Foundation.
Предметные рубрики: BAND HUBBARD-MODEL
COPPER OXIDES
ELEMENTARY EXCITATIONS
SPIN
ELECTRON
STATE
T/U
Аннотация: The effect of non-Heisenberg four-spin ring exchange on the superconducting transition temperature in strongly correlated electron systems is studied. It is shown that the ring exchange can significantly suppress the contribution of the Heisenberg exchange to superconducting pairing.
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