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GEKHT, R. S.
MAGNETIC-STRUCTURES AND PROPERTIES OF STATES IN STRONGLY FRUSTRATED HEISENBERG ANTIFERROMAGNETS / R. S. GEKHT // Zhurnal Eksperimentalnoi Teor. Fiz. - 1992. - Vol. 102, Is. 6. - P. 1968-1982. - Cited References: 23 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
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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Magnetic ordering of Dy in NiFe-Dy bilayer films / I. S. Edel'man [et al.] // JETP Letters. - 1998. - Vol. 67, Is. 5. - P. 339-342, DOI 10.1134/1.567670. - Cited References: 8 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
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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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Edel'man, I. S.; Edelman, I. S.; Khudyakov, A. E.; Zabluda, V. N.; Заблуда, Владимир Николаевич; Markov, V. V.; Марков, Владимир Витальевич; Romanova, O. B.; Романова, Оксана Борисовна
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Gekht, R. S.
Magnetic ordering and phase transitions in planar antiferromagnetic systems with a Kagome lattice / R. S. Gekht, I. N. Bondarenko // J. Exp. Theor. Phys. - 1998. - Vol. 86, Is. 6. - P. 1209-1215, DOI 10.1134/1.558592. - Cited References: 23 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
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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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Bondarenko, I. N.
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Ignatchenko, V. A.
Wave spectrum of multilayers with finite thicknesses of interfaces / V. A. Ignatchenko, Y. I. Mankov, A. A. Maradudin // Phys. Rev. B. - 2000. - Vol. 62, Is. 3. - P. 2181-2184, DOI 10.1103/PhysRevB.62.2181. - Cited References: 24 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
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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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
ИФ СО РАН

Доп.точки доступа:
Mankov, Y. I.; Maradudin, A. A.; Игнатченко, Вальтер Алексеевич
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Kuz'min, E. V.
Effect of frustrations on magnetism in the Ru double perovskite Sr2YRuO6 / E. V. Kuz'min, S. G. Ovchinnikov, D. J. Singh // Phys. Rev. B. - 2003. - Vol. 68, Is. 2. - Ст. 24409, DOI 10.1103/PhysRevB.68.024409. - Cited References: 24 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
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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Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk 660074, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
USN, Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Singh, D. J.
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Val'kov, V. V.
The magnetoelastic mechanism of singlet phase formation in a two-dimensional quantum antiferromagnet / V. V. Val'kov, V. A. Mitskan, G. A. Petrakovskii // J. Exp. Theor. Phys. - 2006. - Vol. 102, Is. 2. - P. 234-247, DOI 10.1134/S106377610602004X. - Cited References: 18 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GROUND-STATE
   SPIN
   TRANSITION
   CUGEO3
   MODEL
Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, Siberian Div, Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
ИФ СО РАН
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Technical University, Krasnoyarsk, 660074, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660075, Russian Federation

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Вальков, Валерий Владимирович
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    Magnetic and transport properties of Gd(0.9)A(0.1)CoO(3-delta) (A = Ba, Sr) / N. V. Kazak [et al.] // J. Magn. Magn. Mater. - 2009. - Vol. 321, Is. 9. - P. 1266-1271, DOI 10.1016/j.jmmm.2008.11.087. - 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 . - ISSN 0304-8853
Рубрики:
PEROVSKITE
   PR
   LA
   EU
   ND
   LN
   TRANSITION
   SPIN
   GD
   SM
Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660074, Russia
Univ Guadalajara, CUCEI, Dept Fis, Guadalajara 44430, Jalisco, Mexico
Siberian Fed Univ, Inst Nat & Humanitary Res, Krasnoyarsk 660041, Russia
AA Galkin Donetsk Phystech Natl Acad Sci Ukraine, UA-83114 Donetsk, Ukraine

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Ivanova, N.B.; Pashkevich, Yu. G.; Michel, C.R.; Bondarenko, G. V.; Бондаренко, Геннадий Васильевич
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Zobov, V. E.
Selective control of the states of multilevel quantum systems using nonselective rotation operators / V. E. Zobov, V. P. Shauro // J. Exp. Theor. Phys. - 2009. - Vol. 108, Is. 1. - P. 5-17, DOI 10.1134/S1063776109010026. - Cited References: 20 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
FOURIER-TRANSFORM
SPIN
Кл.слова (ненормированные):
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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Держатели документа:
[Zobov, V. E.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Shauro, V. P.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Shauro, V. P.; Шауро, Виталий Павлович; Зобов, Владимир Евгеньевич
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Shorikov, A.
Role of electronic correlations in the Fermi surface formation of Na (x) CoO2 / A. . Shorikov, M. M. Korshunov, V. I. Anisimov // JETP Letters. - 2011. - Vol. 93, Is. 2. - P. 80-85, DOI 10.1134/S0021364011020123. - 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"). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
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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Держатели документа:
[Shorikov, A.
Anisimov, V. I.] Russian Acad Sci, Inst Met Phys, Ural Div, Ekaterinburg 620219, Russia
[Korshunov, M. M.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Korshunov, M. M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Korshunov, M. M.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
ИФ СО РАН
Institute of Metal Physics Ural Division, Russian Academy of Sciences, GSP-170, Yekaterinburg 620219, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Max-Planck-Institut fur Physik komplexer Systeme, D-01187 Dresden, Germany
Department of Physics, University of Florida, Gainesville, Florida 32611, United States

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Anisimov, V. I.
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10.

Shneyder, E. I.
Contribution of the non-Heisenberg ring exchange to the magnetic mechanism of high-Tc superconductivity / E. I. Shneyder, S. G. Ovchinnikov, A. V. Shnurenko // JETP Letters. - 2012. - Vol. 95, Is. 4. - P. 193-197, DOI 10.1134/S0021364012040078. - 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. . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
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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Публикация на русском языке Шнейдер, Елена Игоревна. Влияние негейзенберговского кольцевого обмена на магнитный механизм высокотемпературной сверхпроводимости [Текст] / Е. И. Шнейдер, С. Г. Овчинников, А. В. Шнуренко // Письма в Журн. эксперим. и теор. физ. : Санкт-Петербургская издательская фирма "Наука" РАН, 2012. - Т. 95 Вып. 3-4. - С. 211-215

Держатели документа:
[Shneyder, E. I.
Ovchinnikov, S. G.
Shnurenko, A. V.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shnurenko, A. V.; Шнуренко, А. В.; Шнейдер, Елена Игоревна
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