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    Аверьянов, Евгений Михайлович.
    Молекулярно-оптическая и структурная анизотропия нематической смеси Е7 / Е. М. Аверьянов // Жидк. крист. и их практич. использ. - 2019. - Т. 19, № 1. - С. 42-51 ; Liq. Cryst. Appl., DOI 10.18083/LCAppl.2019.1.42. - Библиогр.: 20 . - ISSN 1991-3966. - ISSN 2499-–964
   Перевод заглавия: Molecular-optical and structural anisotropy of the nematic mixture E7

РУБ Crystallography
Рубрики:
LIQUID
ORDER
POLARIZABILITY
Кл.слова (ненормированные):
нематические смеси -- ориентационный порядок нематических смесей -- анизотропия локального поля в нематических смесях -- свойства молекул в нематических смесях -- нематические смеси, ориентационный порядок нематических смесей, анизотропия локального поля в нематических смесях, свойства молекул в нематических смесях -- nematic mixtures -- orientational order of nematic mixtures -- local-field anisotropy in nematic mixtures -- molecular properties in nematic mixtures
Аннотация: Для нематической смеси E7 производных цианобифенила исследована связь показателей преломления nj при поляризациях световой волны вдоль (j = ||) и нормально оптической оси (j = ⊥) с параметрами поляризуемости (компонентами γjα, средним значением γmα = (γ||α + 2γ⊥α)/3, анизотропией δγα = γ||α - γ⊥α) и ориентационным порядком молекул типа α, составляющих смесь. Для смеси введен тензор локального поля с компонентами fj =1+Lj(nj2 – 1). Получена связь компонент тензора Лорентца Lj с компонентами Ljα. Температурные зависимости Lj(Т) для смеси Е7 определены с использованием экспериментальных зависимостей nj(λ,Т) от длины световой волны λ. Подтверждена связь Lj(Ljα). Получена температурная зависимость S(Т) материального параметра порядка смеси. Обнаружено изменение среднего значения γm(Т) = ((γ|| + 2γ⊥)/3 для исследованной смеси за счет изменения S(Т). Показано, что зависимость γm(S) обусловлена противоположными по знаку вкладами от изменения конформации бифенильных остовов молекул и межмолекулярных взаимодействий. Полученные результаты сопоставлены со следствиями использования модельных тензоров fj, известных в литературе для смесей.
The relation of the refractive indices nj of the nematic mixture E7 consisting of cyanobiphenyl derivatives for the light-wave polarization along (j = ||) and across (j = ⊥) the optical axis with the polarizability parameters (components γjα, mean value γmα = (γ||α + 2γ⊥α)/3, anisotropy δγα = γ||α - γ⊥α) and orientational order of α-type molecules comprising the mixture was investigated. The local-field tensor with components fj =1+Lj(nj2 – 1) was introduced for the mixture and the relationship between the Lorentz-tensor components Lj and the components Ljα was established. The temperature dependences Lj(Т) for the E7 mixture were obtained using experimental dependences nj(λ,T). The relationship Lj(Ljα) was confirmed. The temperature dependence of the material order parameter S(T) was obtained. The change of the mean value γm(Т) = ((γ|| + 2γ⊥)/3 for the studied mixture due to changing of S(Т) was observed. The dependence γm(S) was shown to be caused by two opposite-sign contributions due to changing conformation of molecular biphenyl cores and intermolecular interactions. The obtained results were compared with the consequences of using model tensors fj, which literature data are known for mixtures.

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Держатели документа:
Институт физики им. Л. В. Киренского, ФИЦ КНЦ СО РАН, Академгородок, 50, строение № 38, 660036 Красноярск, Россия

Доп.точки доступа:
Aver'yanov, E. M.

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Zhandun, V. S.
Lattice dynamics, ferroelectric and antiferroeelctric instabilities, and the ferroelectric phase transition in disordered PbB(1/2)' B(1/2)'' O(3) (B ' = Ga, In, Lu; B '' = Nb, Ta) solid solutions / V. S. Zhandun, N. G. Zamkova, V. I. Zinenko // J. Exp. Theor. Phys. - 2008. - Vol. 106, Is. 6. - P. 1109-1117, DOI 10.1134/S1063776108060101. - Cited References: 29 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
STATISTICAL-MECHANICS
   PEROVSKITES
   CRYSTALS
   ORDER
   RELAXOR
   BATIO3
   PBTIO3
Кл.слова (ненормированные):
Crystal lattices -- Ferroelectricity -- Lattice vibrations -- Solids -- Ferroelectric (barium strontium titanate) -- Ferroelectric phase transitions -- Lattice (CO) -- Lattice dynamics -- Vibration spectrum -- Ferroelectric materials
Аннотация: The lattice vibration spectra, rf permittivity, and dynamic Born charges of disordered PbB(1/2)'B(1/2)'' O(3) (B' = Ga, In, Lu; B '' = Nb, Ta) solid solutions are calculated in terms of the generalized Gordon-Kim model. All the compounds are found to have soft modes related to the center (Gamma(15)) and boundary point R (R(15)) of the Brillouin zone; the frequencies of these modes are close. The ferroelectric phase transition temperatures and the spontaneous polarization in the ferroelectric phase are calculated for the solid solutions using a model Hamiltonian in the local mode approximation and the Monte Carlo method. These temperatures for the tantalum compounds are found to be higher than for the niobium compounds, and temperature t(s) increases with the atomic number of ion B'. A model where the antiferroelectric state is related to the condensation of modes Gamma(15) and R(15) is proposed. It is found that, for all compounds except for PbSc(1/2)Nb(1/2)O(3) and PbSc(1/2)Ta(1/2)O(3), the ferroelectric phase, which is only related to the condensation of mode R(15), and the antiferroelectric phase have similar energies. In PbIn(1/2)Ta(1/2)O(3), the antiferroelectric phase turns out to be energetically favorable.

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Держатели документа:
[Zhandun, V. S.
Zamkova, N. G.
Zinenko, V. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zinenko, V. I.; Зиненко, Виктор Иванович; Жандун, Вячеслав Сергеевич
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Sukhinin, Y. V.
Ising-like model of tilted phase transitions in Langmuir monolayers / Y. V. Sukhinin // Phys. Rev. B. - 2006. - Vol. 74, Is. 19. - Ст. 195423, DOI 10.1103/PhysRevB.74.195423. - Cited References: 27 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
MONTE-CARLO-SIMULATION
   FATTY-ACID MONOLAYERS
   AIR-WATER-INTERFACE
   AMPHIPHILE MONOLAYERS
   ROTATOR PHASES
   ALKANES
   DIAGRAM
   POTENTIALS
   ORDER
Аннотация: Two Ising models on a rectangular lattice (sigma(1) model and sigma(2) model) linked to three- and four-spin interactions are used to describe the sequence of tilted phase transitions in monolayers of amphiphilic long-chain molecules on an air-water surface. Starting from Morse atom-atom potentials self-consistent equations for basic thermal averages are derived in terms of a mean-field approximation. We employ the model for CH3(CH2)(18)COOH at two values of the molecule density and obtain all known tilted phases, including an intermediate one.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation
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Single magnetic chirality in the magnetoelectric NdFe3((BO3)-B-11)(4) / M. . Janoschek [et al.] // Phys. Rev. B. - 2010. - Vol. 81, Is. 9. - Ст. 94429, DOI 10.1103/PhysRevB.81.094429. - Cited References: 55 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
NEUTRON-DIFFRACTION
   PHASE-TRANSITIONS
   SLOW-NEUTRONS
   CRYSTAL
   NDFE3(BO3)(4)
   EXTINCTION
   NUCLEAR
   ORDER
   MNSI
   ANTIFERROMAGNETS
Аннотация: We have performed an extensive study of single crystals of the magnetoelectric NdFe3 ((BO3)-B-11)(4) by means of a combination of single-crystal neutron diffraction and spherical neutron polarimetry. Our investigation did not detect significant deviations at low temperatures from space group R32 concerning the chemical structure. With respect to magnetic ordering our combined results demonstrate that in the commensurate magnetic phase below T-N approximate to 30 K all three magnetic Fe moments and the magnetic Nd moment are aligned ferromagnetically in the basal hexagonal plane but align antiferromagnetically between adjacent planes. The phase transition to the low-temperature incommensurate (IC) magnetic structure observed at T-IC approximate to 13.5 K appears to be continuous. By means of polarized neutron studies it could be shown that in the incommensurate magnetic phase the magnetic structure of NdFe3((BO3)-B-11)(4) is transformed into a long-period antiferromagnetic helix with single chirality. Close to the commensurate-incommensurate phase transition third-order harmonics were observed, which in addition indicate the formation of magnetic solitons.

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Держатели документа:
[Janoschek, M.
Fischer, P.
Schefer, J.
Roessli, B.
Pomjakushin, V.] Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
[Janoschek, M.
Fischer, P.
Schefer, J.
Roessli, B.
Pomjakushin, V.] ETH, CH-5232 Villigen, Switzerland
[Janoschek, M.] Tech Univ Munich, Phys Dept E21, D-85748 Garching, Germany
[Meven, M.] Tech Univ Munich, Forsch Neutronenquelle Heinz Maier Leibnitz FRM 2, D-85748 Garching, Germany
[Petricek, V.] ASCR, Vvi, Inst Phys, Prague 18221 8, Czech Republic
[Petrakovskii, G.
Bezmaternikh, L.] RAS, SB, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Laboratory for Neutron Scattering, Paul Scherrer Institut and ETH Zurich, CH-5232 Villigen PSI, Switzerland
Physik Department E21, Technische Universitat Munchen, D-85748 Garching, Germany
Department of Physics, University of California, San Diego, San Diego, CA 92093-0354, United States
Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universitat Munchen, D-85748 Garching, Germany
Institute of Physics, ASCR, V.v.i, Na Slovance 2, 182 21 Praha 8, Czech Republic
Institute of Physics, SB RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Janoschek, M.; Fischer, P.; Schefer, J.; Roessli, B.; Pomjakushin, V.; Meven, M.; Petricek, V.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
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    Phase transitions in fluoride KFe2F6 with tetragonal tungsten bronze structure / M. V. Gorev [et al.] // J. Fluor. Chem. - 2014. - Vol. 168. - P. 204-211, DOI 10.1016/j.jfluchem.2014.09.031. - Cited References: 14. - This work was supported by RFBR, project no. 12-02-00056, and the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (grant NSh-924.2014.2). . - ISSN 0022-1139. - ISSN 1873-3328
   Перевод заглавия: Фазовые переходы во фториде KFe2F6 со структурой тетрагональной вольфрамовой бронзы

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
K3FE5F15
490-K
ORDER
Кл.слова (ненормированные):
Tetragonal tungsten bronze structure -- Phase transition -- Charge ordering -- Thermal properties
Аннотация: Heat capacity, thermal dilatation, structure, Mossbauer spectra and dielectric permittivity of fluoride KFe2F6 with tetragonal tungsten bronze crystal structure were studied. The as-made sample undergoes two structural phase transitions P4/mbm (T-1 approximate to 340 K) -> Pbam (T-2 approximate to 250 K) -> G(2) and magnetic phase transformation at T-m approximate to 133 K. Heating up to 600-700 K and subsequent cooling in helium atmosphere leads to a change of phase transition temperatures and diffused anomalies in thermal expansion. The results obtained and influence of thermal prehistory of the sample on its physical properties are discussed in the context of previous studies on related fluorides KFe2F6, which sometimes suggest conflicting structural details. (C) 2014 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, Siberian Dept, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
CNRS, Inst Chim Matiere Condensee, F-33608 Pessac, France

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Tressaud, A.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Bayukov, O. A.; Баюков, Олег Артемьевич; RFBR [12-02-00056]; Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-924.2014.2]
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P = T-PHASE DIAGRAMS OF ELPASOLITES RB2KB3+F6(B3+ = HO,DY,TB) / M. V. GOREV [и др.] // Fiz. Tverd. Tela. - 1993. - Vol. 35, Is. 4. - P. 1022-1027. - Cited References: 16 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
RIGID SPHERE MODEL
   RB2KMIIIF6 ELPASOLITES
   TRANSITIONS
   ORDER

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Доп.точки доступа:
GOREV, M. V.; FLEROV, I. N.; VORONOV, V. N.; MISYUL, S. V.
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Martynov, S. N.
Ground state of an antiferromagnet with uniform antisymmetric exchange in a magnetic field / S. N. Martynov, V. I. Tugarinov // JETP Letters. - 2010. - Vol. 92, Is. 2. - P. 115-119, DOI 10.1134/S0021364010140092. - Cited References: 12 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
INCOMMENSURATE
TRANSITION
ORDER
Аннотация: A system of two nonlinear differential equations for sublattice angles is proposed to describe the spin orientation distribution in a planar antiferromagnet with uniform antisymmetric exchange in a magnetic field. This system involves the initial symmetry of the problem and is reduced to a single delay differential equation. The solutions of this system are parameterized by the initial condition imposed on the angle of one sublattice at the hyperbolic singular point of the phase space. The numerical analysis of the stability boundary of soliton solutions demonstrates that the transition to the commensurate phase takes place outside the region where the stochastic solutions appear and is accompanied by the magnetization jump Delta m similar to 10(-1) m.

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Держатели документа:
[Martynov, S. N.
Tugarinov, V. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Tugarinov, V. I.; Тугаринов, Василий Иванович; Мартынов, Сергей Николаевич
}
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Makarov, I. A.
Temperature dependence of the electronic structure of La2CuO4 in the multielectron LDA+GTB approach / I. A. Makarov, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2015. - Vol. 121, Is. 3. - P. 457-464, DOI 10.1134/S1063776115090174. - Cited References: 38. - The work was supported by the Russian Science Foundation (project no. 14-12-00061) . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
Copper oxides
   Model
   Superconductivity
   Excitations
   Instability
   Spectrum
   States
   Order
Аннотация: The band structure of La2CuO4 in antiferromagnetic and paramagnetic phases is calculated at finite temperatures by the multielectron LDA+GTB method. The temperature dependence of the band spectrum and the spectral weight of Hubbard fermions is caused by a change in the occupation numbers of local multielectron spin-split terms in the antiferromagnetic phase. A decrease in the magnetization of the sublattice with temperature gives rise to new bands near the bottom of the conduction band and the top of the valence band. It is shown that the band gap decreases with increasing temperature, but La2CuO4 remains an insulator in the paramagnetic phase as well. These results are consistent with measurements of the red shift of the absorption edge in La2CuO4 with increasing temperature. © 2015, Pleiades Publishing, Inc.

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Публикация на русском языке Макаров, Илья Анатольевич. Температурная зависимость электронной структуры La2CuO4 в многоэлектронном подходе LDA+GTB [Текст] / И. А. Макаров, С. Г. Овчинников // Журн. эксперим. и теор. физ. : Наука, 2015. - Т. 148 Вып. 3. - С. 526-534

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

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
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Magnetic-field-induced structural transition in polymer-dispersed liquid crystals / A. M. Parshin [et al.] // Mol. Cryst. Liquid Cryst. - 2012. - Vol. 557, Is. 1. - P. 50-59, DOI 10.1080/15421406.2011.632237. - Cited References: 19. - This study was supported by the Presidium of the Russian Academy of Sciences (Project no. 24.1) and the Siberian Branch of the Russian Academy of Sciences (grant no. 43). . - ISSN 1542-1406

РУБ Crystallography
Рубрики:
FRANK CONSTANTS
   ELECTRIC-FIELD
   NEMATIC DROPS
   ANISOTROPY
   ALIGNMENT
   FILMS
   ORDER
Кл.слова (ненормированные):
Anchoring energy -- magnetic field -- polymer-dispersed liquid crystals -- structural transition -- temperature fluctuations
Аннотация: The structural transition occurring in droplets of nematic liquid crystals formed in a polymer in magnetic field is studied. The transition is caused by field-driven weakening of tangential surface anchoring and develops following two scenarios: bipolar structure/homogeneous structure or bipolar structure/radial structure. The first scenario suggests a cyclic transition occurring upon thermal fluctuations without field. The structural transition is considered within a model of the biaxial liquid crystal/polymer interface. The model describes tendency of the nematic director to align tangentially on a droplet's surface, normally under the action of flexoelectric polarization, and axially along the magnetic-field-imposed easy orientation axis.

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Держатели документа:
[Parshin, A. M.
Nazarov, V. G.
Zyryanov, V. Ya.
Shabanov, V. F.] Krasnoyarsk Sci Ctr, LV Kirensky Inst Phys, Krasnoyarsk, Russia

Доп.точки доступа:
Parshin, A. M.; Паршин, Александр Михайлович; Nazarov, V. G.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович
}
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10.

Magnetic properties and the mechanism of formation of the uncompensated magnetic moment of antiferromagnetic ferrihydrite nanoparticles of a bacterial origin / D. A. Balaev [et al.] // J. Exp. Theor. Phys. - 2014. - Vol. 119, Is. 3. - P. 479-487, DOI 10.1134/S1063776114080044. - Cited References: 42. - This work was supported by the Ministry of Education and Science of the Russian Federation (state contract in 2014-2016) and a program of the Siberian Branch of the Russian Academy of Sciences. . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
Рубрики:
NIO NANOPARTICLES
   EXCHANGE BIAS
   HYSTERESIS ANOMALIES
   FERRITIN
   SURFACE
   MOSSBAUER
   ORDER
   SIZE
Аннотация: The magnetic properties of the superparamagnetic ferrihydrite nanoparticles that form as a result of the vital activity of Klebsiella oxytoca bacteria are studied. Both an initial powder with an average number of iron atoms N Fe ∼ 2000–2500 in a particle and this powder after annealing at 140°C for 3 h in air are investigated. The following substantial modifications of the magnetic properties of the ferrihydrite nanoparticles are detected after annealing: the superparamagnetic blocking temperature increases from 23 to 49.5 K, and the average magnetic moment of a particle increases (as follows from the results of processing of magnetization curves). The particles have antiferromagnetic ordering, and the magnetic moment resulting in the superparamagnetism of the system appears due to random spin decompensation inside the particle. For this mechanism, the number of uncompensated spins is proportional to the number of magnetically active atoms raised to the one-half power, and this relation holds true for the samples under study at a good accuracy. The possible causes of the detected shift of magnetic hysteresis loops at low temperatures upon field cooling are discussed.

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Публикация на русском языке Магнитные свойства и механизм формирования нескомпенсированного магнитного момента антиферромагнитных наночастиц ферригидрита бактериального происхождения [Текст] / Д. А. Балаев [и др.] // Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 146 Вып. 3. - С. 546–556

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660041, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Int Sci Ctr Extreme States Organisms, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Ladygina, V. P.; Ладыгина, Валентина Петровна; Ishchenko, L. A.; Ищенко, Л. А.; Ministry of Education and Science of the Russian Federation; Siberian Branch of the Russian Academy of Sciences
}
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