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Malakhovskii, A. V.
Optical and magneto-optical spectra and electron structure of ErAl3(BO3)4 single crystal / A. V. Malakhovskii, V. V. Sokolov, I. A. Gudim // J. Alloys Compd. - 2017. - Vol. 698. - P. 364-374, DOI 10.1016/j.jallcom.2016.12.200. - Cited References: 32. - The work was supported by the Russian Foundation for Basic Researches grant 16-02-00273 and by the President of Russia grant No Nsh-7559.2016.2. . - ISSN 0925-8388
Кл.слова (ненормированные):
Electron structure -- Er3+ ion -- f-f transitions -- Magnetic circular dichroism
Аннотация: Linearly polarized absorption spectra and magnetic circular dichroism (MCD) spectra of ErAl3(BO3)4 single crystal were measured in the range of 10000–27000 cm−1 at 90 K. The Stark components of the ground and excited multiplets of Er3+ ion were identified in terms of the irreducible representations, basing on the linearly polarized absorption spectra. MCD spectra permitted us to measure the Zeeman splitting of some transitions and so to determine changes of the Landé factors along the C3 axis during these transitions. Additionally, the MCD spectra permitted us to identify some states in the |J,±MJ〉function approximation. In particular, it was shown that the ground state of the Er3+ ion in this approximation has MJ = ± 13/2 that corresponds to magnetic moment m = ±7.8 μB. Very intensive f-f vibronic transitions, corresponding to electron transitions from the upper components of the ground multiplet, were revealed. Energies of the local vibrations in a number of the excited states were found.

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Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Gudim, I. A.; Гудим, Ирина Анатольевна; Малаховский, Александр Валентинович
}
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Val'kov, V. V.
Effect of intersite repulsion on the correlation functions and thermodynamics of an Ising chain with annealed magnetic disorder / V. V. Val’kov, M. S. Shustin // Bull. Russ. Acad. Sci. Phys. - 2016. - Vol. 80, Is. 11. - P. 1335-1337, DOI 10.3103/S1062873816110290. - Cited References: 6. - This work was supported by the Russian Foundation for Basic Research, project nos. 13-02-00073, 14-02-31237, and 15-42-04372. . - ISSN 1062-8738
Кл.слова (ненормированные):
Chains -- Magnetic susceptibility -- Temperature distribution -- Thermodynamics -- Transfer matrix method -- Correlation function -- Equilibrium behavior -- Equilibrium distributions -- Non-magnetic impurities -- Quantum phase transitions -- Repulsion parameter -- Temperature dependence -- Transfer matrix technique -- Phase transitions
Аннотация: An exact solution for a model describing the equilibrium behavior of an ensemble of Ising chains with nonmagnetic intersite repulsion of nearest neighbors and an equilibrium distribution of nonmagnetic impurities is obtained using the transfer matrix technique. The possibility of exciting quantum phase transitions using the intersite repulsion parameter in a system is demonstrated. Proximity to the critical points of these transitions has a substantial effect on the temperature dependence of a system’s magnetic susceptibility. © 2016, Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Влияние эффектов межузельного отталкивания на корреляционные функции и термодинамику изинговской цепочки с отожженным магнитным беспорядком [Текст] / В. В. Вальков, М. С. Шустин // Изв. РАН. Сер. физич. - 2016. - Т. 80 № 11. - С. 1504-1506

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

Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович
}
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Nature of phase transitions in ammonium oxofluorovanadates, a vibrational spectroscopy study of (NH4)3VO2F4 and (NH4)3VOF5 / Y. V. Gerasimova [et al.] // Spectrochim. Acta A. - 2017. - Vol. 176. - P. 106-113, DOI 10.1016/j.saa.2017.01.004. - Cited References: 48. - This study was partially supported by the Ministry of Education and Science of the Russian Federation and Krasnoyarsk Regional Foundation for Scientific Support and Scientific-Technical Activity. The reported study was partially funded by RFBR according to the research project No. 16-32-00351 mol_a. We thank A.M. Ziatdinov for recording EPR spectra and V.G. Kuryavyi for EDX analysis of (NH4)3VOF5. . - ISSN 1386-1425
Кл.слова (ненормированные):
Ammonium oxofluorovanadates -- Order-disorder -- Dynamics -- Phase transitions -- Infrared -- Raman
Аннотация: Two ammonium oxofluorovanadates, (NH4)3VO2F4 and (NH4)3VOF5, have been investigated by temperature-dependent infrared and Raman spectroscopy methods to determine the nature of phase transitions (PT) in these compounds. Dynamics of quasioctahedral groups was simulated within the framework of semi-empirical approach, which justified the cis-conformation of VO2F43 − (C2v) and the C4v geometry of VOF53 −. The observed infrared and Raman spectra of both compounds at room temperature (RT) revealed the presence at least of two crystallographically independent octahedral groups. The first order PT at elevated temperatures is connected with a complete dynamic disordering of these groups with only single octahedral state. At lower temperatures, the octahedra are ordered and several octahedral states appear. This PT is the most pronounced in the case of (NH4)3VOF5, when at least seven independent VOF53 − octahedra are present in the structure below 50 K, in accordance with the Raman spectra. Ammonium groups do not take part in PTs at higher and room temperatures but their reorientational motion freezes at lower temperatures.

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Держатели документа:
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Laboratory of Optical Materials, Institute of Chemistry, FEB RAS, Vladivostok, Russian Federation

Доп.точки доступа:
Gerasimova, Y. V.; Герасимова, Юлия Валентиновна; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Laptash, N. M.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Shestakov, N. P.; Шестаков, Николай Петрович; Ershov, A. A.; Ершов, Александр Андреевич; Kocharova, A. G.; Кочарова, Алла Георгиевна
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Thermophysical study of structural phase transitions in Na0.95Li0.05NbO3 solid solution / M. V. Gorev [et al.] // Bull. Russ. Acad. Sci. Phys. - 2016. - Vol. 80, Is. 9. - P. 1046-1050, DOI 10.3103/S1062873816090148. - Cited References: 18. - This work was supported by Southern Federal University, project no. 213.01-2014/012-VG. . - ISSN 1062-8738
Кл.слова (ненормированные):
Niobium oxide -- Sodium -- Specific heat -- Temperature distribution -- Thermal expansion -- Ceramic samples -- Effect of heat treatments -- Possible mechanisms -- Sodium lithium niobate -- Structural distortions -- Structural phase transition -- Temperature dependence -- Temperature range -- Lithium
Аннотация: Temperature dependences of specific heat Cp(T) and coefficient of thermal expansion α(T) for Na0.95Li0.05NbO3 sodium-lithium niobate ceramic samples are investigated in the temperature range of 100–800 K. The Cp(T) and α(T) anomalies at T3 = 310 ± 3 K, T2 = 630 ± 8 K, and T1 = 710 ± 10 K are observed, which correspond to the sequence of phase transitions N ↔ Q ↔ S(R) ↔ T2(S). The effect of heat treatment of the samples on the sequence of structural distortions was established. It is demonstrated that annealing of the samples at 603 K leads to splitting of the anomaly corresponding to the phase transition Q → R/S in two anomalies. After sample heating to 800 K, the only anomaly is observed in both the Cp(T) and α(T) dependence. Possible mechanisms of the observed phenomena are discussed.

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Публикация на русском языке Теплофизические исследования структурных фазовых переходов в твердом растворе Na0.95Li0.05NbO3 [Текст] / М. В. Горев [и др.] // Изв. РАН. Сер. физич. - 2016. - Т. 80 № 9. - С. 1145-1149

Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Southern Federal University, Rostov-on-Don, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Raevskaya, S. I.; Flerov, I. N.; Флёров, Игорь Николаевич; Malitskaya, M. A.; Raevskii, I. P.
}
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Spectroscopy of f-f transitions, crystal-field calculations, and magnetic and quadrupole helix chirality in DyFe3(BO3)4 / M. N. Popova [et al.]. - Electronic text data // ArXiv. - 2016. - Ст. 1611.07092. - Cited References: 47. - This work was supported by the Russian Science Foundation (Grant No14-12-01033). I. A. G. thanks L. N. Bezmaternykh for useful comments concerning the crystal growth and the Russian Foundation for Basic Research for a financial support under Grant No 14-02-00307a.
Аннотация: Recently, quadrupole helix chirality and its domain structure was observed in resonant x-ray diffraction experiments on DyFe3(BO3)4 using circularly polarized x rays [T. Usui et al., Nature Materials 13, 611 (2014)]. We show that this effect can be explained quantitatively by calculating the quadrupole moments of the Dy3+ ions induced by the low-symmetry (C2) crystal-field (CF) component. In this work, the CF parameters for the Dy3+ ions in the P3121 (P3221) phase of DyFe3(BO3)4 are obtained from CF calculations based on the analysis of high-resolution temperature-dependent optical spectroscopy data. We also consider the helix chirality of the single-site magnetic susceptibility tensors of the Dy3+ ions in the paramagnetic P3121 (P3221) phase and suggest a neutron diffraction experiment to reveal it.

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Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, 108840 Moscow, Troitsk, Russia
Department of Physics, New Jersey Institute of Technology, 07102 Newark, New Jersey, USA
Kazan Federal University, 420008 Kazan, Russia
Kirensky Institute of Physics, Siberian Branch of RAS, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Popova, M. N.; Chukalina, E. P.; Boldyrev, K. N.; Stanislavchuk, T. N.; Malkin, B. Z.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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    Val'kov, V. V.
    The modification of low-temperature magnetic properties of the Fe-based double-zigzag single-chain magnet under irradiation / V. V. Val'kov, M. S. Shustin // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 19-22, DOI 10.1016/j.jmmm.2016.12.100. - Cited References: 14. - This study was supported by the Presidium of the Russian Academy of Sciences, program Actual problems of low temperature physics (project 0358-2015-0005); the Russian Foundation for Basic Research, projects nos. 16-42-243057 (partly with Government of Krasnoyarsk Territory) and 15-42-04372; Technology Support Fund to the research project nos. 14/16. The work of M.S.S. was supported by grant of the President of the Russian Federation (project MK-1398.2017.2). . - ISSN 0304-8853
   Перевод заглавия: Модификация низкотемпературных свойств железо содержащего одноцепочечного магнетика с магнитной топологией двойного зигзага

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPIN-CROSSOVER
MODEL
Кл.слова (ненормированные):
Single-chain magnets -- Light-induced spin crossover -- Magnetic susceptibility -- Quantum phase transitions
Аннотация: An exact solution for a generalized Ising model describing single-chain magnet {[FeIII(Tp*)(CN)3]2FeII(bpmh)}·2H2O with alternating high-spin and low-spin iron ions and double-zigzag magnetic topology has been calculated making use of the transfer-matrix technique. The introduction of a statistical ensemble taking into account the presence of iron ions with high-spin (HS) and low-spin (LS) states made it possible to describe the modification of magnetic susceptibility under optical irradiation. It has been shown that joint implementation of iron ions with photoinduced magnetic states and non-magnetic intersite repulsion ions of these states is caused by the difference of the ionic radii of HSFeIIHSFeII and LSFeIILSFeII leads to the quantum phase transitions in the system.

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Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
}
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Terahertz spectroscopy of crystal-field transitions in magnetoelectric TmAl3(BO3)4 / A. M. Kuzmenko [et al.] // Phys. Rev. B. - 2016. - Vol. 94, Is. 17. - Ст. 174419, DOI 10.1103/PhysRevB.94.174419. - Cited References:35. - This work was partially supported by the Russian Foundation for Basic Research (Grants No. 14-02-91000, No. 15-02-07647, No. 14-02-00307, No. 13-02-12442, and No. 15-42-04186), Sci. school-924.2014.2, and by the Austrian Science Funds (Grants No. I815-N16, No. W-1243, and No. P27098-N27). . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Physics, Condensed Matter
Рубрики:
ELECTRIC POLARIZATION
PHASE-TRANSITIONS
SINGLE-CRYSTALS
Аннотация: Dynamic magnetic properties of magnetoelectric TmAl3(BO3)4 borate have been investigated by terahertz spectroscopy. Crystal-field transitions within the ground multiplet H36 of Tm3+ ions are observed and they are identified as magnetic-dipole transitions from the ground singlet A1 to the next excited doublet E of Tm3+ ions. Unexpected fine structure of the transitions is detected at low temperatures. The new modes are assigned to local distortions of the sites with D3 symmetry by Bi3+ impurities, which resulted in the splitting of the A1→E transition. Two types of locally distorted sites are identified and investigated. The main contribution to the static magnetic susceptibility is shown to be determined by the matrix elements of the observed magnetic transitions. We demonstrate that even in case of local distortions the symmetry of the undistorted crystal is recovered for magnetic and for quadratic magnetoelectric susceptibilities.

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Держатели документа:
Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow 119991, Russia.
Vienna Univ Technol, Inst Solid State Phys, A-1040 Vienna, Austria.
Siberian Branch RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kuzmenko, A. M.; Mukhin, A. A.; Ivanov, V. Yu.; Komandin, G. A.; Shuvaev, A.; Pimenov, A.; Dziom, V.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Research [14-02-91000, 15-02-07647, 14-02-00307, 13-02-12442, 15-42-04186]; Sci. school [924.2014.2]; Austrian Science Funds [I815-N16, W-1243, P27098-N27]
}
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    Crystal structure and phase transitions of a layered perovskite-like CsScF4 crystal / A. S. Krylov [et al.] // CrystEngComm. - 2016. - Vol. 18, Is. 43. - P. 8472-8486, DOI 10.1039/c6ce01144f. - Cited References:47. - The authors are grateful to Prof. I. N. Flerov for valuable support and useful discussions. This work was partly supported by the Russian Foundation for Basic Research, Project 16-02-00102. The research is partially conducted within the framework of the state task of the Ministry of Education and Science of the Russian Federation for Siberian Federal University on R&D performance in 2014 (Task 3.2534.2014/K). X-ray data from powders, Raman NMR, and IR spectra were obtained with use the analytical equipment of Krasnoyarsk Center of collective use SB RAS. . - ISSN 1466-8033
   Перевод заглавия: Кристаллическая структура и фазовые переходы в слоистом перовскитоподобном кристалле CsScF4

РУБ Chemistry, Multidisciplinary + Crystallography
Рубрики:
NEGATIVE THERMAL-EXPANSION
RAMAN-SCATTERING
LATTICE-DYNAMICS
Аннотация: This work is devoted to the complex research on temperature phase transitions in a CsScF4 crystal. The crystal structure was solved and refined at different temperatures by using the Rietveld method. Structural phase transitions were investigated by using the following spectroscopic methods, some of them for the first time: Brillouin spectroscopy, Raman spectroscopy, IR absorption spectroscopy and NMR. The symmetry analysis of the Brillouin zone center of all phases is presented. The vibrational spectra of the crystal in three phases have been calculated. The structural phase transition mechanism was determined. The transitions at T-1 = 475 K and T-2 = 317.5 K are of displacement type. The Raman soft modes have been associated with rotations of the ScF6 octahedral group.

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Держатели документа:
SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
SB RAS, Inst Automat & Electrometry, Novosibirsk 630090, Russia.

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Misyul, S. V.; Krylova, S. N.; Крылова, Светлана Николаевна; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Ivanenko, A. A.; Иваненко, Александр Анатольевич; Zykova, V. A.; Ivanov, Y. N.; Иванов, Юрий Николаевич; Sukhovsky, A. A.; Суховский, Андрей Андреевич; Voronov, V. N.; Воронов, Владимир Николаевич; Safonov, I. N.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Russian Foundation for Basic Research [16-02-00102]
}
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Klimin, S. A.
Spin-phonon and electron-phonon interactions in multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 evidenced by IR reflection spectroscopy / S. A. Klimin, M. A. Kashchenko, L. N. Bezmaternykh // J. Low Temp. Phys. - 2016. - Vol. 185, Is. 5-6. - P. 538-543, DOI 10.1007/s10909-016-1597-6. - Cited References:19. - The authors thank Alexey Kuzmenko and Marina Popova for fruitful discussions. This paper was supported by the Russian Science Foundation under Grant No. 14-12-01033, by the Swiss National Science Foundation (SNSF), and by the Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva. . - ISSN 0022-2291. - ISSN 1573-7357

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   GdFe3(BO3)4
   CRYSTALS
   SPECTRUM
Кл.слова (ненормированные):
Multiferroics -- IR-active phonons -- Spin-phonon interaction -- Coupled -- electron-phonon mode
Аннотация: We study temperature-dependent polarized reflection spectra of multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 single crystals. Signatures of spin–lattice interactions in both compounds and of a formation of the electron–phonon coupled mode in TbFe3(BO3)4 are discussed.

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Держатели документа:
Inst Spect RAS, Moscow 108840, Russia.
Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia.
RAS, Siberian Branch, Kirenskiy Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kashchenko, M. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Russian Science Foundation [14-12-01033]; Swiss National Science Foundation (SNSF); Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva
}
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10.

    Crystal growth and Raman spectroscopy study of Sm1-xLaxFe3(BO3)4 ferroborates / E. Moshkina [et al.] // Cryst. Growth Des. - 2016. - Vol. 16, Is. 12. - P. 6915-6921, DOI 10.1021/acs.cgd.6b01079. - Cited References: 17. - This work was supported by the Russian Foundation for Basic Research, Project No. 14-02-00307. . - ISSN 1528-7483
   Перевод заглавия: Рост кристаллов и исследование ферроборатов Sm1-xLaxFe3(BO3)4 методом спектроскопии комбинационного рассеяния света
Кл.слова (ненормированные):
Crystal lattices -- Iron compounds -- Raman spectroscopy -- Single crystals -- Crystal nucleation -- Flux methods -- Internal structure -- Magnetic phase transitions -- Magnon scattering -- Spectral region -- Temperature range -- Wave numbers -- Lanthanum
Аннотация: Sm1-xLaxFe3(BO3)4 (x = 0, 0.75) single crystals were synthesized using the flux method. The crystal nucleation procedure and flux parameters are reported. Conditions for growing the Sm1-xLaxFe3(BO3)4 (x = 0, 0.75) single crystals are described. The prepared crystals were studied by Raman spectroscopy in the temperature range of T = 10-300 K. The spectral region corresponding to temperatures of T = 10-55 K, which involves the temperatures of the magnetic phase transition TN = 32 K for x = 0 and TN = 31 K for x = 0.75, was thoroughly analyzed. Anomalies related to the magnetic ordering established in both compounds were found. The main changes occur in the low-wavenumber region (up to 100 cm-1), where the mode corresponding to magnon scattering arises. This mode is shown to have the internal structure indicative of the occurrence of unstable vibrations (40-80 cm-1). The results obtained are analyzed by calculating the empirical lattice dynamics in Sm1-xLaxFe3(BO3)4 with x = 0 and x = 1. © 2016 American Chemical Society.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Krylov, A. S.; Крылов, Александр Сергеевич; Sofronova, S. N.; Софронова, Светлана Николаевна; Gudim, I. A.; Гудим, Ирина Анатольевна; Temerov, V. L.; Темеров, Владислав Леонидович
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11.

Investigation of phase transitions and physical properties of LiNH4SO4 / K. S. Aleksandrov [и др.] // The first Soviet-Japanese symposium on ferroelectricity : abstracts / предс. орг. ком.: K. S. Aleksandrov, J. Kobayashi ; зам. предс. орг. ком.: A. T. Shuvalov, G. A. Smolensky, T. Nakamura ; секр. орг. ком. A. T. Anistratov ; чл. орг. ком. Y. E. Nesterikhin [и др.]. - Krasnoyarsk, 1976. - С. 85-87

Доп.точки доступа:
Aleksandrov, K. S. \предс. орг. ком.\; Александров, Кирилл Сергеевич; Kobayashi, J. \предс. орг. ком.\; Shuvalov, A. T. \зам. предс. орг. ком.\; Smolensky, G. A. \зам. предс. орг. ком.\; Nakamura, T. \зам. предс. орг. ком.\; Anistratov, A. T. \секр. орг. ком.\; Nesterikhin, Y. E. \чл. орг. ком.\; Rzhanov, A. V. \чл. орг. ком.\; Sakudo, T. \чл. орг. ком.\; Onaka, R. \чл. орг. ком.\; Hoshino, S. \чл. орг. ком.\; Ikada, T. \чл. орг. ком.\; Kinase, V. \чл. орг. ком.\; Aleksandrov, K. S.; Aleksandrova, I. P.; Anistratov, A. T.; Shabanov, V. F.
Нет сведений об экземплярах (Источник в БД не найден)
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12.

    Sequence of phase transitions in (NH4)3SiF7 / S. V. Mel'nikova [et al.] // Dalton Trans. - 2017. - Vol. 46, Is. 8. - P. 2609-2617, DOI 10.1039/c6dt04874a. - Cited References: 26. - The reported study was partially supported by RFBR, research project no. 15-02-02009a. . - ISSN 1477-9226
   Перевод заглавия: Последовательность фазовых переходов в (NH4)3SiF7
Кл.слова (ненормированные):
Group theory -- Single crystals -- X ray diffraction -- Atomic displacement -- Double salts -- Driving forces -- Group-theoretical analysis -- Order parameter -- Polarization optics -- Temperature changes -- Hydrogen bonds
Аннотация: Single crystals of silicon double salt (NH4)3SiF7 = (NH4)2SiF6·NH4F = (NH4)3[SiF6]F were grown and studied by the methods of polarization optics, X-ray diffraction and calorimetry. A sequence of symmetry transformations with the temperature change was established: P4/mbm (Z = 2) (G1) ↔ Pbam (Z = 4) (G2) ↔ P21/c (Z = 4) (G3) ↔ P1 (Z = 4) (G4) ↔ P21/c (Z = 8) (G5). Crystal structures of different phases were determined. The experimental data were also interpreted by a group-theoretical analysis of the complete condensate of order parameters taking into account critical and noncritical atomic displacements. Strengthening of the N–H⋯F hydrogen bonds can be a driving force of the observed phase transitions.

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Держатели документа:
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Laptash, N. M.; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Misyul, S. V.; Flerov, I. N.; Флёров, Игорь Николаевич
}
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13.

    Аверьянов, Евгений Михайлович.
    Изменение поляризуемости молекул при фазовых переходах изотропная жидкость – нематик – смектик A – кристалл B в жидком кристалле 4O.8 / Е. М. Аверьянов // Жидк. кристаллы и их практич. использ. - 2017. - Т. 17, Вып. 2. - С. 6-13 ; Liquid Crystals and their Application, DOI 10.18083/LCAppl.2017.2.6. - Библиогр.: 24. - Данная работа выполнена в рамках проекта 0356-2015-0411 Комплексной программы Сибирского отделения РАН № II.2П. . - ISSN 1991-3966
   Перевод заглавия: Change of polarizability of molecules at the isotropic liquid - nematic - smectic A - crystal B phase transitions of the liquid crystal 4O.8
Кл.слова (ненормированные):
поляризуемость мезогенных молекул -- фазовые переходы в жидких кристаллах -- конформация молекул -- межмолекулярные взаимодействия -- polarizability of mesogenic molecules -- phase transitions in liquid crystals -- molecular conformation -- intermolecular interactions
Аннотация: Определены температурные зависимости параметров молекулярной поляризуемости (продольной и поперечной компонент, среднего значения и анизотропии) в нематической, смектической А и кристаллической В фазах жидкого кристалла 4-бутилоксибензилиден-4'-октиланилина. Для нематической фазы установлены предсказанные ранее нелинейные зависимости параметров поляризуемости от параметра ориентационного порядка молекул. Обнаружено влияние конденсации одномерной волны плотности при переходе нематик – смектик А и квазидвумерной кристаллизации слабо связанных слоев при переходе смектик А – кристалл В на изменение параметров поляризуемости. Установлена связь изменений поляризуемости в каждой фазе с изменением конформации ароматических остовов молекул и межмолекулярными взаимодействиями.
The temperature dependences of molecular polarizability parameters (longitudinal and transverse components, mean value and anisotropy) were determined in nematic, smectic A and crystalline B phases of 4-butyloxybenzylidene-4'-octylaniline (4O.8) liquid crystal. For the nematic phase, the earlier predicted nonlinear dependences of polarizability parameters on the orientational order parameter were revealed. The influence of the one-dimensional density-wave condensation at the nematic - smectic A phase transition and the quasi-twodimensional crystallization of weekly-connected smectic layers at the smectic A - crystal B phase transition on polarizability parameters was discovered. It was established that the changes of polarizability parameters within each phase of the studied liquid crystal are connected either with the change in the conformation of the aromatic molecular cores or with intermolecular interactions.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 50 Akademgorodok, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aver'yanov, E. M.

}
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14.

Malakhovskii, A. V.
Natural optical activity of f-f transitions in ErAl3(BO3)4 single crystal / A. V. Malakhovskii, V. V. Sokolov, I. A. Gudim // Chem. Phys. - 2017. - Vol. 493. - P. 102-110, DOI 10.1016/j.chemphys.2017.06.011. - Cited References: 50. - The work was supported by the Russian Foundation for Basic Researches grant 16-02-00273 and by the President of Russia grant No Nsh-7559.2016.2. . - ISSN 0301-0104
Кл.слова (ненормированные):
f-f transitions -- Natural circular dichroism -- Er3+ ion
Аннотация: Absorption and natural circular dichroism (NCD) spectra of ErAl3(BO3)4 single crystal were measured at 90 K in the range of 10,000–28,200 cm−1. The spectra were decomposed on the Lorentz shape components and the natural optical activities (NOA) of f-f transitions between Stark components of the ground and excited multiplets were found. The NCD spectra permitted us to find out existence of two non equivalent positions of Er3+ ion in one of its excited states, which are due to the local decrease of the crystal symmetry in this state. Very large NOA of a vibronic line was revealed. This phenomenon was accounted for basing on the new quantum mechanical formula for the NOA of electron transitions. The principle difference of the NOA properties of electric dipole allowed and parity forbidden transitions is discussed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Gudim, I. A.; Гудим, Ирина Анатольевна; Малаховский, Александр Валентинович
}
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15.

Raman scattering and phase transitions in fluorides with elpasolite structure / A. Vtyurin [et al.] // Ferroelectrics : Proceedings of the Joint International Symposium. - 2017. - Vol. 512, Is. 1. - P. 58-64, DOI 10.1080/00150193.2017.1349863. - Cited References: 22 . - ISSN 0015-0193
Кл.слова (ненормированные):
Ferroelectric materials -- Ferroelectricity -- Elpasolite -- First-order phase transitions -- Fluorescence process -- Raman lines -- Raman scattering spectra -- Temperature phase -- Temperature range -- Raman scattering
Аннотация: Raman scattering spectra of Rb2KHoF6 and Rb2KDyF6 crystals have been studied in temperature range from 20 K to 399 K and from 7 K to 500 K respectively. Raman spectra of Rb2KHoF6 crystal are distorted due to the fluorescence process. Parameters of Raman lines have been quantitatively analyzed. The investigation points to the considerable role of CX6 groups in the temperature phase transition in Rb2KHoF6 and Rb2KDyF6 crystals. The anomalies of spectra changes with temperature testify the first order phase transitions in these crystals. © 2017 Taylor & Francis Group, LLC.

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Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Krylova, S. N.; Крылова, Светлана Николаевна; Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(13 ; 2016 ; June 19-24 ; Matsue, Japan); International Workshop on Relaxor Ferroelectrics(8 ; June 19-24, 2016 ; Matsue, Japan)
}
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16.

Gorev, M. V.
T-p phase diagrams and the barocaloric effect in materials with successive phase transitions / M. V. Gorev, E. V. Bogdanov, I. N. Flerov // J. Phys. D. - 2017. - Vol. 50, Is. 38. - Ст. 384002, DOI 10.1088/1361-6463/aa8025. - Cited References:51. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project no. 17-42-240076 p-a. . - ISSN 0022-3727. - ISSN 1361-6463

РУБ Physics, Applied
Рубрики:
SOLID-STATE REFRIGERATION
ELECTROCALORIC REFRIGERATION
MAGNETIC
Кл.слова (ненормированные):
barocaloric effect -- phase transition -- phase diagram -- entropy
Аннотация: An analysis of the extensive and intensive barocaloric effect (BCE) at successive structural phase transitions in some complex fluorides and oxyfluorides was performed. The high sensitivity of these compounds to a change in the chemical pressure allows one to vary the succession and parameters of the transformations (temperature, entropy, baric coefficient) over a wide range and obtain optimal values of the BCE. A comparison of different types of schematic T-p phase diagrams with the complicated dependences observed experimentally shows that in some ranges of temperature and pressure the BCE in compounds undergoing successive transformations can be increased due to a summation of caloric effects associated with distinct phase transitions. The maximum values of the extensive and intensive BCE in complex fluorides and oxyfluorides can be realized at rather low pressure (0.1-0.3 GPa). In a narrow temperature range around the triple points conversion from conventional BCE to inverse BCE is observed, which is followed by a gigantic change of both |ΔSBCE| and |ΔTAD|.

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Держатели документа:
RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660074, Russia.
Krasnoyarsk State Agrarian Univ, Inst Engn Syst & Energy, Krasnoyarsk 660049, Russia.

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Flerov, I. N.; Флёров, Игорь Николаевич; Горев, Михаил Васильевич; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [17-42-240076 p-a]
}
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17.

Magnetic and structural phase transitions in systems with spin crossover under pressure / Y. S. Orlov [et al.] // JETP Letters. - 2017. - Vol. 105, Is. 12. - P. 771-774, DOI 10.1134/S0021364017120104. - Cited References:12. - This work was supported by the Government of Krasnoyarsk region, by the Krasnoyarsk Regional Foundation for Support of the Scientific and Scientific-Technical Activity (project nos. 16-42-243048, 16-42-240746, and 16-42-240413), by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project nos. SP-1844.2016.1 and NSh-7559.2016.2), by the Foundation for the Development of Theoretical Physics "Bazis," and by the Russian Foundation for Basic Research (project nos. 17-02-00826, 16-02-00507, 16-02-00098, and 16-02-00273). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
FEBO3
Аннотация: The effect of the exchange interaction between excited high-spin terms of transition metal ions in magnetic Mott–Hubbard insulators on the thermodynamics of the system with singlet terms of ions in the ground state near the crossover of singlet and high-spin terms with the increase in the pressure is studied with the effective Hamiltonian. It is shown that the crossover at the temperature below the critical T* ‹ TN is a first-order phase transition and is accompanied by a volume jump. The crossover at the temperature above T* is accompanied by a smooth change in the crystal volume.

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Публикация на русском языке Магнитные и структурные фазовые переходы в системах со спиновым кроссовером под давлением [Текст] / Ю. С. Орлов [и др.] // Письма в ЖЭТФ : Наука, 2017. - Т. 105 Вып. 11-12. - С. 732-736

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Univ Guadalajara, Dept Fis, CUCEI, Guadalajara 44420, Jalisco, Mexico.

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Nesterov, A. I.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Government of Krasnoyarsk region by the Krasnoyarsk Regional Foundation for Support of the Scientific and Scientific-Technical Activity [16-42-243048, 16-42-240746, 16-42-240413]; Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools [SP-1844.2016.1, NSh-7559.2016.2]; Foundation for the Development of Theoretical Physics "Bazis"; Russian Foundation for Basic Research [17-02-00826, 16-02-00507, 16-02-00098, 16-02-00273]
}
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18.

In situ Raman spectroscopic study of interaction between phengite and water under P–T conditions typical of subduction zones / S. V. Goryainov [et al.] // Bull. Russ. Acad. Sci. Phys. - 2017. - Vol. 81, Is. 5. - P. 590-593, DOI 10.3103/S1062873817050100. - Cited References: 14 . - ISSN 1062-8738
Кл.слова (ненормированные):
High pressure engineering -- Spectroscopic analysis -- Cold subduction -- Diamond-anvil cell -- High temperature and pressure -- High-pressure and temperatures -- In-situ Raman spectroscopy -- Polymorphic transitions -- Resistively heated -- Subduction zones -- Raman spectroscopy
Аннотация: In situ Raman spectroscopy is used to study the layered mineral phengite K(Al, Mg)2(Si, Al)4O10(OH)2 in water under the high temperature and pressure conditions typical of cold subduction zones (T up to 373°C and P = 12.5 GPa). High pressure and temperature were created in a resistively heated diamond anvil cell. Raman spectra show the high P–T stability of phengite. No reversible polymorphic transitions (overhydration or notable amorphization) are observed. © 2017, Allerton Press, Inc.

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Публикация на русском языке In situ КР-исследование взаимодействия фенгита с водной средой при субдукционных P-J-параметрах [Текст] / С. В. Горяйнов [и др.] // Изв. РАН. Сер. физич. - 2017. - Т. 81 № 5. - С. 637-640

Держатели документа:
Sobolev Institute of Geology and Mineralogy, Russian Academy of Sciences, Siberian Branch, Novosibirsk, Russian Federation
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Akademgorodok, Krasnoyarsk, Russian Federation
Ural State University of Economics, Yekaterinburg, Russian Federation

Доп.точки доступа:
Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Polyansky, O. P.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Zmeeva, N. Y.
}
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19.

Spectroscopy of f-f transitions, crystal-field calculations, and magnetic and quadrupole helix chirality in DyFe3(BO3)4 / M. N. Popova [et al.] // Phys. Rev. B. - 2017. - Vol. 95, Is. 12. - Ст. 125131, DOI 10.1103/PhysRevB.95.125131. - Cited References: 49. - This paper was supported by the Russian Scientific Foundation (Grant No. 14-12-01033). I.A.G. thanks L. N. Bezmaternykh for useful comments concerning the crystal growth and the Russian Foundation for Basic Research for financial support under Grant No. 14-02-00307a. . - ISSN 1098-0121
Аннотация: We present the results of temperature- and polarization-dependent high-resolution optical spectroscopy studies of DyFe3(BO3)4 performed in spectral ranges 40-300cm-1 and 3000-23000cm-1. The crystal-field (CF) parameters for the Dy3+ ions in the P3121 (P3221) phase of DyFe3(BO3)4 are obtained from calculations based on the analysis of the measured f-f transitions. Recently, quadrupole helix chirality and its domain structure was observed in resonant x-ray diffraction experiments on DyFe3(BO3)4 using circularly polarized x rays [T. Usui, Y. Tanaka, H. Nakajima, M. Taguchi, A. Chainani, M. Oura, S. Shin, N. Katayama, H. Sawa, Y. Wakabayashi, and T. Kimura, Nat. Mater. 13, 611 (2014)10.1038/nmat3942]. Using the obtained set of the CF parameters, we calculate temperature dependencies of the electronic quadrupole moments of the Dy3+ ions induced by the low-symmetry (C2) CF component and show that the quadrupole helix chirality can be explained quantitatively. We also consider the temperature dependencies of the bulk magnetic dc-susceptibility and the helix chirality of the single-site magnetic susceptibility tensors of the Dy3+ ions in the paramagnetic P3121 (P3221) phase and suggest the neutron and resonant x-ray diffraction experiments in a magnetic field to reveal the helix chirality of field-induced magnetic moments. © 2017 American Physical Society.

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Доп.точки доступа:
Popova, M. N.; Chukalina, E. P.; Boldyrev, K. N.; Stanislavchuk, T. N.; Malkin, B. Z.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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20.

Low-temperature absorption spectra and electron structure of HoFe3(BO3)4 single crystal / A. V. Malakhovskii [et al.] // Физ. низких температур. - 2017. - Т. 43, Вып. 5. - С. 764-771. - Библиогр.: 33 . - ISSN 0132-6414
Кл.слова (ненормированные):
f-f transitions -- Ho3+ ion -- Excited states -- Local properties
Аннотация: Polarized absorption spectra of HoFe3(BO3)4 single crystal in the range of 8500-24500 cm-1 were studied as a function of temperature beginning from 2 K. The ground and excited electron states of Ho3+ were identified. The abrupt changes of the spectra at the reorientation phase transition at 4.7 K were observed. The exchange splitting of some excited states were revealed and measured. They changed at the reorientation phase transition. Several vibronic transitions were observed. The splitting of absorption lines corresponding to the C2 local symmetry of the Ho ion was not observed. Moreover, spectra of some absorption bands correspond to splitting in the cubic crystal field. There are some absorption lines, whose polarization can not be explained both in D3 and C2 local symmetries. Some lines appear or disappear as a result of the transition from the easy axis to the easy plane state of the crystal. All these observations testify to the substantial changes of the local magnetic and structural properties in the excited states of the Ho3+ ion and to the strong influence of the magnetic moments orientation on the polarization of the electron transitions.

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"Переводная" версия Low-temperature absorption spectra and electron structure of HoFe3(BO3)4 single crystal [Текст] / A. V. Malakhovskii [et al.] // Low Temp. Phys : American Institute of Physics, 2017. - Vol. 43 Is. 5.- P.610-616

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkov, Ukraine

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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