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    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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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.
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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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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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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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    Thermal properties of (NH4)2MeF6·NH4F (Me: Ti, Sn) crystals undergoing transformation between two cubic phases / E. I. Pogoreltsev [et al.] // Ferroelectrics. - 2016. - Vol. 501, Is. 1. - P. 20-25, DOI 10.1080/00150193.2016.1198659. - Cited References: 9. - The reported study was partially supported by RFBR, research project No 15-02-02009-a . - ISSN 0015-0193
   Перевод заглавия: Тепловые свойства кристаллов (NH4)2MeF6ћNH4F (Me: Ti, Sn) претерпевающих трансформацию между двумя кубическими фазами
Кл.слова (ненормированные):
Phase transitions -- fluorides -- heat capacity -- entropy -- phase diagram
Аннотация: The heat capacity, thermal expansion, and T-p phase diagrams of (NH4)3TiF7 and (NH4)3SnF7 were studied in wide temperature and pressure ranges. The total excess entropies at successive Pa-3 ↔ P4/mnc ↔ 4/m (Ti) and single Pa-3 ↔ Pm-3m (Sn) phase transitions are close to each other and characteristic for the order–disorder processes. The Pm-3m cubic phase and direct Pa-3 ↔ Pm-3m transformation were found at high pressure in (NH4)3TiF7. The different sign of baric coefficients for phase transition between two cubic phases in (NH4)3TiF7 and (NH4)3SnF7 was supposed due to nonlinear phase boundary with pressure in the latter fluoride.

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Держатели документа:
Kirensky Institute of Physics, Siberian Department of RAS, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radioelectronic, Siberian State University, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, Khabarovsk, Russian Federation
Institute of Chemistry, Far Eastern Department of RAS, Vladivostok, Russian Federation

Доп.точки доступа:
Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
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Investigation of structural and magnetic phase transitions in multiferroic rare-earth tetraborate crystals with huntite structure by Raman spectroscopy / A. S. Krylov [et al.] // Joint 13th Russia/CIS/Baltic/Japan Symp. on Ferroelectricity and Int. Workshop on Relaxor Ferroelectrics (RCBJSF-IWRF 2016) : book of abstracts. - 2016. - Ст. Oral-15. - References: 4

Материалы конференции

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Moshkina, E. M.; Мошкина, Евгения Михайловна; Sofronova, S. N.; Софронова, Светлана Николаевна; Gudim, I. A.; Гудим, Ирина Анатольевна; Temerov, V. L.; Темеров, Владислав Леонидович; Vtyurin, A. N.; Втюрин, Александр Николаевич; Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(13 ; 2016 ; Jun. ; 19-23 ; Matsue, Japan); International Workshop on Relaxor Ferroelectrics(2016 ; Jun. ; 19-23 ; Matsue, Japan)
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    Intensive electrocaloric effect in triglycine sulfate under nonequilibrium thermal conditions and periodic electric field / V. S. Bondarev [et al.] // Phys. Status Solidi B. - 2016. - Vol. 253, Is. 10. - P. 2073-2078, DOI 10.1002/pssb.201600339. - Cited References:29. - The reported study was funded by RFBR and Government of Krasnoyarsk Territory according to the research project no. 16-42-240428 p_a. . - ISSN 0370-1972. - ISSN 1521-3951
   Перевод заглавия: Интенсивный электрокалорический эффект в триглицинсульфате в неравновесных тепловых условиях и периодическом электрическом поле

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
electrocaloric effect -- ferroelectrics -- nonequilibrium processes -- phase -- transitions
Аннотация: We present the results of both direct measurements and modeling of the intensive electrocaloric effect ΔTAD in ferroelectric triglycine sulfate under nonequilibrium thermal conditions and periodically varying electric field. In the narrow region around the phase transition temperature TC, a visible difference was observed between the electrocaloric responses at applying ΔTON and removal ΔTOFF of the constant electric field: |ΔTON| <|ΔTOFF| and |ΔTON| > |ΔTOFF| at T < TC and T > TC, respectively. The variation of the frequency and profile of the periodic electric field at T < TC allowed one to obtain the gradual decrease in the average temperature of the top of the sample compared to the bottom kept at the constant temperature. At low frequency electric field, qualitative agreement was found between the time dependences of the measured experimentally and calculated ΔT values. Experimental and modeling studies of electrocaloric effect ΔTAD in triglycine sulfate showed that the applying/removal of a periodic electric field to/from the bulk sample decreases the average value of the waiving temperature of the top Ttop compared to T ≃ const of the bottom. Both frequency and duty cycle of the electric field impulses strongly affect Ttop.

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

Доп.точки доступа:
Bondarev, V. S.; Бондарев, Виталий Сергеевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; RFBR; Government of Krasnoyarsk Territory [16-42-240428 p_a]
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10.

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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