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Makarov, I. A.
Dependence of the critical temperature of high-temperature cuprate superconductors on hoppings and spin correlations between CuO2 planes / I. A. Makarov, S. G. Ovchinnikov, E. I. Shneider // J. Exp. Theor. Phys. - 2012. - Vol. 114, Is. 2. - P. 329-342, DOI 10.1134/S1063776112020264. - Cited References: 73. - This study was supported in part by the Presidium of the Russian Academy of Sciences (program "Quantum Physics of Condensed Media," project no. 18.7), jointly by the Siberian and Ural branches of the Russian Academy of Sciences (integration projects project no. 40), the Russian Foundation for Basic Research (project no. 09-02-00127), the Presidential Program in Support of Young Scientists in Russia (project no. MK-1683.2010.2), and the federal target program "Specialists" (project no. P891). One of the authors (E.I.Sh.) gratefully acknowledges support from the nonprofit Dynasty foundation. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   BAND HUBBARD-MODEL
   SINGLE-CRYSTALS
   TRANSITION-TEMPERATURE
   FERMI-SURFACE
   DOPING DEPENDENCE
   THERMAL-EXPANSION
   COPPER OXIDES
   ANISOTROPY
   LA2-XSRXCUO4
Аннотация: The influence of interlayer hoppings on the superconducting transition temperature (T c) in bilayer cuprates has been studied. The parameter of hopping between layers is expressed as t ⊥(k) = t ⊥(cos(k x ) − cos(k y ))2 and treated as a small perturbation for the states of two CuO2 planes described by the t-t′-t″-J* model. In the generalized mean field approximation for dx2−y2{d_{{x. } - {y. }}} symmetry of the superconducting gap, neither the interlayer hopping or exchange interaction, nor the pair hopping between CuO2 layers provides an additional mechanism of Cooper pair formation or an increase in T c. In the concentration dependence of T c, the bilayer splitting of the upper Hubbard band of quasi-holes is manifested as two peaks with temperatures slightly lower than the maximum T c for a single-layer cuprate. Interlayer antiferromagnetic spin correlations suppress bilayer splitting.

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Публикация на русском языке Макаров, Илья Анатольевич. Зависимость критической температуры высокотемпературных сверхпроводников от перескоков и спиновых корреляций между CuO2-плоскостями [Текст] / И. А. Макаров, С. Г. Овчинников, Е. И. Шнейдер // Журн. эксперим. и теор. физ. : Наука, 2012. - Т. 141 Вып. 2. - С. 372-386

Держатели документа:
[Makarov, I. A.
Ovchinnikov, S. G.
Shneider, E. I.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Makarov, I. A.
Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneider, E. I.] Reshetnikov Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneider, E. I.; Шнейдер, Елена Игоревна; Макаров, Илья Анатольевич
}
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Val'kov, V. V.
Low temperature spectral properties of 1D magnets with twisting and mutually orthogonal arrangement of easy planes / V. V. Val’kov, M. S. Shustin // Bull. Russ. Acad. Sci. Phys. - 2015. - Vol. 79, Is. 6. - P. 734-736, DOI 10.3103/S1062873815060337. - Cited References: 4. - The work was supported by the Russian Foundation for Basic Research, project nos. 13-02-00523, 13-02-98013, and 14-02-31280). . - ISSN 1062-8738
Аннотация: The exitation spectrum of a ferrimagnetic Heisenberg chain with four sublattices and twisting mutually ortoghonal easy planes is calculated using a diagram technique of atomic representation. It is shown that at low temperatures, the exitation spectrum of elementary excitations of the system is similar to the spectrum of a magnet with an effective easy-axis type anisotropy directed along the line of easy plane intersection. © 2015, Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Низкотемпературные спектральные свойства 1D-магнетика с чередующимися взаимно ортогональными плоскостями легкого намагничивания [Текст] / В. В. Вальков, М. С. Шустин // Изв. РАН. Сер. физич. - 2015. - Т. 79 № 6. - С. 811-813

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

Доп.точки доступа:
Shustin, M. S.; Вальков, Валерий Владимирович
}
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Ovchinnikov, S. G.
Effect of interlayer tunneling on the electronic structure of bilayer cuprates and quantum phase transitions in carrier concentration and high magnetic field / S. G. Ovchinnikov, I. A. Makarov, E. I. Shneyder // J. Exp. Theor. Phys. - 2011. - Vol. 112, Is. 2. - P. 288-302, DOI 10.1134/S106377611005119X. - Cited References: 64. - This study was supported financially by the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences (project no. 5.7), the integration projects of the Siberian Branch and the Ural Division of the Russian Academy of Sciences (project no. 40), the Russian Foundation for Basic Research (project no. 09-02-00127), the President of the Russian Federation (grant no. MK-1683.2010.2), and the Federal Target Program P891. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   HIGH-TEMPERATURE SUPERCONDUCTORS
   DIMENSIONAL HUBBARD-MODEL
   FERMI-SURFACE
   COPPER OXIDES
   GROUND-STATE
   CUO2 PLANES
   SPECTRUM
   BAND
   NMR
Кл.слова (ненормированные):
Antibonding -- Bi-layer -- Bilayer cuprates -- Complex sequences -- Cuprates -- Doping levels -- External magnetic field -- Field magnitude -- Hartree-Fock approximations -- High magnetic fields -- Lifshitz transition -- Main effect -- Orbitals -- Perturbation theory -- Quantum phase transitions -- Quantum transitions -- Single-layer structure -- Theoretical study -- Unit cells -- Carrier concentration -- Copper compounds -- Density functional theory -- Electronic properties -- Electronic structure -- Hartree approximation -- Magnetic fields -- Perturbation techniques -- Phase transitions -- Surface structure -- Quantum theory
Аннотация: We present a theoretical study of the electronic structure of bilayer HTSC cuprates and its evolution under doping and in a high magnetic field. Analysis is based on the t-t'-taEuro(3)-J* model in the generalized Hartree-Fock approximation. Possibility of tunneling between CuO2 layers is taken into account in the form of a nonzero integral of hopping between the orbitals of adjacent planes and is included in the scheme of the cluster form of perturbation theory. The main effect of the coupling between two CuO2 layers in a unit cell is the bilayer splitting manifested in the presence of antibonding and bonding bands formed by a combination of identical bands of the layers themselves. A change in the doping level induces reconstruction of the band structure and the Fermi surface, which gives rise to a number of quantum phase transitions. A high external magnetic field leads to a fundamentally different form of electronic structure. Quantum phase transitions in the field are observed not only under doping, but also upon a variation of the field magnitude. Because of tunneling between the layers, quantum transitions are also split; as a result, a more complex sequence of the Lifshitz transitions than in single-layer structures is observed.

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Влияние межслойного туннелирования на электронную структуру двухслойных купратов и квантовые фазовые переходы по концентрации носителей и сильному магнитному полю [Текст] / С. Г. Овчинников, И. А. Макаров, Е. И. Шнейдер // Журнал экспериментальной и теоретической физики. - 2011. - Т. 139 Вып. 2. - С. 334-350

Держатели документа:
[Ovchinnikov, S. G.
Makarov, I. A.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.
Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
}
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Magnetic and EPR studies of the EuFe3(BO3)(4) single crystal / V. P. Dyakonov [et al.] // Eur. Phys. J. B. - 2010. - Vol. 78, Is. 3. - P. 291-298, DOI 10.1140/epjb/e2010-10059-3. - Cited References: 23. - A.A. Prokhorov is grateful to Mianowski Fund for financial support. . - ISSN 1434-6028

РУБ Physics, Condensed Matter
Рубрики:
EARTH
GDFE3(BO3)(4)
MULTIFERROICS
Кл.слова (ненормированные):
Absorption lines -- Antiferromagnetic orderings -- Applied magnetic fields -- Basal planes -- Easy direction of magnetizations -- Electron paramagnetic resonance -- EPR measurements -- EPR spectra -- EPR studies -- Europium ions -- Exchange fields -- G factors -- Lorentz -- Magnetic measurements -- Magnetic subsystems -- Orientation dependence -- Sub-lattices -- Temperature dependence -- Temperature range -- Trigonal symmetry -- Zeeman effect -- Antiferromagnetism -- Crystal orientation -- Europium -- Magnetic fields -- Magnetic moments -- Magnetic variables measurement -- Magnetization -- Paramagnetic resonance -- Paramagnetism -- Single crystals -- Spectroscopy -- Electron spin resonance spectroscopy
Аннотация: Magnetic and electron paramagnetic resonance (EPR) properties of EuFe3(BO3)(4) single crystals have been studied over the temperature range of 300-4.2 K and in a magnetic field up to 5 T. The temperature, field and orientation dependences of susceptibility, magnetization and EPR spectra are presented. An antiferromagnetic ordering of the Fe subsystem occurs at about 37 K. The easy direction of magnetization perpendicular to the c axis is determined by magnetic measurements. Below 10 K, we observe an increase of susceptibility connected with the polarization of the Eu sublattice by an effective exchange field of the ordered Fe magnetic subsystem. In a magnetic field perpendicular to the c axis, we have observed an increase of magnetization at T < 10 K in the applied magnetic field, which can be attributed to the appearance of the magnetic moment induced by the magnetic field applied in the basal plane. According to EPR measurements, the distance between the maximum and minimum of derivative of absorption line of the Lorentz type is equal to 319 Gs. The anisotropy of g-factor and linewidth is due to the influence of crystalline field of trigonal symmetry. The peculiarities of temperature dependence of both intensity and linewidth are caused by the influence of excited states of europium ion (Eu3+). It is supposed that the difference between the g-factors from EPR and the magnetic measurements is caused by exchange interaction between rare earth and Fe subsystems via anomalous Zeeman effect.

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Держатели документа:
[Dyakonov, V. P.
Szymczak, R.
Berkowski, M.
Szymczak, H.] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[Dyakonov, V. P.
Prokhorov, A. D.
Zubov, E.
Prokhorov, A. A.
Varyukhin, V.] NANU, AA Galkin Donetsk Physicotech Inst, UA-83114 Donetsk, Ukraine
[Petrakovskii, G.
Bezmaternikh, L.] RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Physics, PAS, Al. Lotnikyw 32/46, Warsaw 02-668, Poland
A.A. Galkin Donetsk Physico-Technical Institute, NANU, R. Luxembourg str. 72, Donetsk 83114, Ukraine
L.V. Kirenski Institute of Physics, SB of RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Dyakonov, V. P.; Szymczak, R.; Prokhorov, A. D.; Zubov, E.; Prokhorov, A. A.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Berkowski, M.; Varyukhin, V.; Szymczak, H.
}
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Peculiarity of interrelation between electronic and magnetic properties of HTSC cuprates associated with short-range antiferromagnetic order / S. G. Ovchinnikov [et al.] // J. Exp. Theor. Phys. - 2010. - Vol. 111, Is. 1. - P. 104-113, DOI 10.1134/S1063776110070101. - Cited References: 48. - This study was financially supported by the Russian Foundation for Basic Research (project nos. 09-02-01224 and 09-02-00127) and under the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences (project no. 5.7). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   NORMAL-STATE
   FERMI-SURFACE
   RESISTIVITY ANISOTROPY
   3-CENTER INTERACTIONS
   OPTICAL CONDUCTIVITY
   COPPER OXIDES
   CUO2 PLANES
   SUPERCONDUCTORS
   TRANSPORT
Кл.слова (ненормированные):
Anisotropic resistivity -- Antiferromagnetic orders -- Concentration dependence -- Cuprates -- Doping levels -- Electronic and magnetic properties -- Fermi surface topology -- High temperature superconducting -- Magnetic orders -- Magnetic state -- Maximum values -- Pseudo-gap -- Short-range magnetic orders -- Strong electron correlations -- Temperature dependence -- Anisotropy -- Antiferromagnetic materials -- Antiferromagnetism -- Copper compounds -- Correlators -- Electronic properties -- High temperature superconductors -- Hole concentration -- Magnetic properties -- Neon -- Superconducting magnets -- Single crystals
Аннотация: We report on the results of measurements of anisotropic resistivity of RBa(2)Cu(3)O(6 + x) (R = Tm, Lu) high-temperature superconducting single crystals in a wide range of doping levels, indicating a nontrivial effect of magnetic order on the electronic properties of cuprates. In particular, our results visually demonstrate the crossover from the state with moderate anisotropy of resistivity rho (c) /rho (ab) similar to 30 to a strongly anisotropic state with rho (c) /rho (ab) similar to 7 x 10(3) upon cooling as well as upon a decrease in the hole concentration in the CuO(2) planes. It is also shown that anisotropy is sensitive to the magnetic state of CuO(2) planes and attains its maximum value after the establishment of the long-range antiferromagnetic order. The results are discussed in the framework of the theory based on the t-t'-taEuro(3)-J model of CuO(2) layers taking into account strong electron correlations and short-range magnetic order. In this theory, anomalies of spin correlators and Fermi surface topology for a critical hole concentration of p* a parts per thousand 0.24 are demonstrated. The concentration dependence of the charge carrier energy indicates partial suppression of energy due to the emergence of a pseudogap at p < p*. This theory explains both the experimentally observed sensitivity of anisotropy in conductivity to the establishment of the antiferromagnetic order and the absence of anomalies in the temperature dependence of resistivity rho (ab) (T) in the vicinity of the N,el temperature.

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Публикация на русском языке Особенность взаимосвязи электронных и магнитных свойств ВТСП-купратов, обусловленная ближним антиферромагнитным порядком [Текст] / С. Г. Овчинников [и др.] // Журн. эксперим. и теор. физ. - 2010. - Т. 138 Вып. 1.- P.115-125

Держатели документа:
[Ovchinnikov, S. G.
Korshunov, M. M.] Russian Acad Sci, Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Korshunov, M. M.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[Kozeeva, L. P.
Lavrov, A. N.] Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Branch, Novosibirsk 630090, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Department of Physics, University of Florida, Gainesville, FL 32611, United States
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Kozeeva, L. P.; Lavrov, A. N.; Лавров, Александр Николаевич
}
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Magnetic and specific heat properties of YFe3(BO3)(4) and ErFe3(BO3)(4) / E. A. Popova [et al.] // J. Phys.: Condens. Matter. - 2010. - Vol. 22, Is. 11. - Ст. 116006, DOI 10.1088/0953-8984/22/11/116006. - Cited References: 26. - This work was supported by DFG grants 436 RUS and HE 3439/6 (FOR 520). The authors are indebted to M N Popova and B Z Malkin for valuable discussions. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
LINEAR-CHAIN ANTIFERROMAGNETISM
   CRYSTAL-STRUCTURE
   GDFE3(BO3)(4)
   MULTIFERROICS
   BA2COS3
   ORDER
Кл.слова (ненормированные):
Antiferromagnetic orders -- Basal planes -- Experimental data -- Magnetically ordered state -- Antiferromagnetism -- Calorimetry -- Erbium -- Magnetic moments -- Single crystals -- Specific heat -- Magnetic domains
Аннотация: The present paper reports on the specific heat and magnetization of the YFe3(BO3)(4) and ErFe3(BO3)(4) single crystals. In both compounds, antiferromagnetic order of the iron spins evolves at T-N = 38 K. The experimental data suggest that the magnetic moments are in the basal plane of the trigonal crystal for both compounds. In the magnetically ordered state the crystal is subdivided into three types of domains, the magnetic moments of the Fe3+ ions being aligned along the a axis within each domain. For ErFe3(BO3)(4), two non-equivalent magnetic positions of the Er3+ ions in each domain are observed.

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Держатели документа:
[Popova, E. A.] Tech Univ, Moscow State Inst Elect & Math, Moscow 109028, Russia
[Vasiliev, A. N.] Moscow MV Lomonosov State Univ, Low Temp Phys & Superconduct Dept, Moscow 119991, Russia
[Temerov, V. L.
Bezmaternykh, L. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Tristan, N.
Klingeler, R.
Buechner, B.] Leibniz Inst Solid State & Mat Res IFW Dresden, D-01171 Dresden, Germany
ИФ СО РАН
Moscow State Institute of Electronics and Mathematics (Technical University), 109028 Moscow, Russian Federation
Low Temperature Physics and Superconductivity Department, Moscow State University, 119991 Moscow, Russian Federation
L v Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation
Leibniz-Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany

Доп.точки доступа:
Popova, E. A.; Vasiliev, A. N.; Temerov, V. L.; Темеров, Владислав Леонидович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Tristan, N.; Klingeler, R.; Buchner, B.
}
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Gavrichkov, V. A.
Low-energy electron spectrum in copper oxides in the multiband p-d model / V. A. Gavrichkov, S. G. Ovchinnikov // Phys. Solid State. - 1998. - Vol. 40, Is. 2. - P. 163-168, DOI 10.1134/1.1130262. - Cited References: 31 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TC SUPERCONDUCTORS
   SR2CUO2CL2
   STATES
   PLANES
Аннотация: An exact diagonalization of the Hamiltonian in the p-d model of a CuO6 cluster was used to obtain dependences on the model parameters of the lowest-energy two-hole terms: the energy difference between the 2p orbitals of planar and apical oxygen Delta(apex) = epsilon(2p) - epsilon[2p(apex)], the crystal field parameter Delta(d) = epsilon(3z2-r2)-epsilon(x2-y2), and the ratio of the distances between the copper atom and the apical and planar oxygen atoms d(apex)/d(pl). In the limit of large d(apex)/d(pl) and Delta(d), OUT model is equivalent to the three-band p-d model and, in this case, large singlet-triplet splitting Delta epsilon greater than or equal to 1 eV is also observed. As the parameters decrease, a singlet-triplet crossover is observed. Two mechanisms are identified for stabilization of the tripler term B-3(1g)(0) as the ground state. It is shown that for realistic values of the parameters, reduction of the p-d model to the three-band model is limited by the low energies of the current excitations because of the presence of the lower excited B-3(1g), and (1)A(1g) cluster states. Intercluster hopping causes strong mixing of singlet and triplet states far from the Gamma point. The results of the calculations are compared with data obtained by angle-resolved photoelectron emission in Sr2CuO2Cl2. (C) 1998 American Institute of Physics.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович
}
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Martynov, S. N.
The incommensurate magnetic structure of a tetragonal antiferromagnet with antisymmetric exchange / S. N. Martynov // J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 6. - P. 979-988, DOI 10.1134/S1063776109120097. - Cited References: 34 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
FLUCTUATION-INDUCED PHASE
   FIELD-INDUCED GAP
   COPPER METABORATE
   WEAK FERROMAGNETISM
   SOLITON LATTICE
   SPIN-WAVES
   CUB2O4
   BA2CUGE2O7
   CSCUCL3
   CHAINS
Кл.слова (ненормированные):
Anti-symmetric -- Antiferromagnetic sublattices -- Antiferromagnets -- Antisymmetric exchange -- Exchange bonds -- Ferromagnetic component -- Ferromagnetic moments -- Ginzburg-Landau functional -- Incommensurate magnetic structures -- Mean field approximation -- Modulation vectors -- Polarization planes -- Polarization vectors -- Symmetry groups -- Antiferromagnetic materials -- Antiferromagnetism -- Crystal orientation -- Crystal symmetry -- Ferromagnetic materials -- Ferromagnetism -- Magnetic devices -- Magnetic structure -- Modulation -- Polarization -- Vector spaces -- Vectors -- Crystallography
Аннотация: Analysis of the incommensurate magnetic structure that emerges for two coexisting types of the antisymmetric Dzyaloshinski-Moriya exchange interaction (the weakly ferromagnetic component of vector D along the tetragonal axis and the helicoidal component distributed in the tetragonal plane) is carried out for the first time for a tetragonal antiferromagnet. The helicoidal component for each pair of interacting spins has a 2D distribution; its direction in the tetragonal plane depends on the direction of the exchange bond in each pair. The Lifshits invariant of the Ginzburg-Landau functional is obtained, which is responsible for the formation of an incommensurate magnetic structure for such a distribution. It is shown in the mean field approximation that the incommensurate magnetic structure that forms in this case is a nonlinear double helicoid with a modulation vector lying in the tetragonal plane and with a varying angle between the polarization planes of quasi-antiferromagnetic sublattices. The ground state of the magnet is degenerate in the orientation of the modulation vector in the tetragonal plane. The rate of variation in the orientations of moments in the polarization planes passing through the tetragonal axis is controlled by the angle between the directions of the moments and the tetragonal axis. The local weakly ferromagnetic moment remaining in the polarization plane varies in magnitude and sign. The relation between the orientations of the modulation and polarization vectors is derived for the cases of simple and inversion tetragonal axes in the space symmetry group of the crystal.

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Мартынов, Сергей Николаевич
}
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Ryzhkov, I. I.
Convective stability of multicomponent fluids in the thermogravitational column / I. I. Ryzhkov, V. M. Shevtsova // Phys. Rev. E. - 2009. - Vol. 79, Is. 2. - Ст. 26308, DOI 10.1103/PhysRevE.79.026308. - Cited References: 26 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
THERMAL-DIFFUSION
   SORET COEFFICIENT
   MIXTURES
   SEPARATION
   LIQUID
Кл.слова (ненормированные):
convection -- density -- flow instability -- Galerkin method -- heat transfer -- mass transfer -- thermal diffusion -- Binary mixtures -- Fluids -- Galerkin methods -- Linear stability analysis -- Ternary systems -- Thermal diffusion -- Planes -- Binary fluids -- Convective stabilities -- Cross-diffusion effects -- Density stratifications -- Individual components -- Linear stabilities -- Longitudinal instabilities -- Longitudinal waves -- Multi-component fluids -- Separation ratios -- Soret effects -- Stability problems -- Temperature gradients -- Ternary fluids -- Ternary mixtures -- Thermal diffusion coefficients -- Transversal waves -- Vertical axis -- Vertical directions -- System stability
Аннотация: A comprehensive linear stability analysis of convection in the thermogravitational column is first performed for multicomponent fluids. Two types of perturbations are investigated: Longitudinal waves propagating in vertical direction of the column and transversal waves propagating perpendicular to the vertical axis and temperature gradient. The stability problems are reduced to those without cross-diffusion effect by a special transformation. The calculations are performed for binary and ternary mixtures by the Galerkin method. It is found that in binary fluids, the onset of longitudinal instability can be monotonic or oscillatory depending on the separation ratio, which characterizes the Soret effect. The difference between stability characteristics of binary and ternary fluids is associated with different diffusion times of components in a ternary system. It is shown that the mechanism of transversal instability is related to the unstable density stratification in the column (in total or due to individual components). The unstable stratification can only be realized in fluids with negative Soret effect. The analogue of exchange of stabilities principle for a plane column with a multicomponent fluid is proved. The obtained results indicate that the thermogravitational column can be used for measuring diffusion and thermal diffusion coefficients in ternary and higher mixtures with one or several components having negative Soret effect.

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Держатели документа:
[Ryzhkov, Ilya I.
Shevtsova, Valentina M.] Univ Libre Bruxelles, Dept Chem Phys, MRC, B-1050 Brussels, Belgium
[Ryzhkov, Ilya I.] Inst Computat Modelling SB RAS, Krasnoyarsk 660036, Russia
ИВМ СО РАН
MRC, Department of Chemical Physics, Universite Libre de Bruxelles, av. F.D. Roosevelt 50, B-1050 Brussels, Belgium
Institute of Computational Modelling, SB, RAS, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shevtsova, V. M.
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10.

APLESNIN, S. S.
MAGNETIC-PROPERTIES OF ANTIFERROMAGNETICS WITH FLUCTUATIONALLY INTERACTING PLANES / S. S. APLESNIN // Fiz. Tverd. Tela. - 1993. - Vol. 35, Is. 8. - P. 2105-2109. - Cited References: 5 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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