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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Shinkorenko A. S., Zinenko V. I., Pavlovskii M. S.
Заглавие : Ab initio investigation of physical properties and phase diagram of magnetic tetraborate crystals M+2B4O7
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст.K.P20. - P.354. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 4
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pavlovskii M. S., Shinkorenko A. S., Zinenko V. I.
Заглавие : Band structure, lattice dynamics and magnetoelectric properties of double perovskite La2CuTiO6
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P3.17. - P.201. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Ключевые слова (''Своб.индексиров.''): lattice dynamics--magnetoelectrics
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pavlovskii M. S., Andryushin N. D.
Заглавие : Calculating the Lattice Dynamics in the RFe3(BO3)4 Crystals in the Quasi-Harmonic Approximation
Место публикации : Phys. Solid State. - 2019. - Vol. 61, Is. 11. - P.2019-2025. - ISSN 10637834 (ISSN), DOI 10.1134/S106378341911026X
Примечания : Cited References: 14. - This study was supported by the Russian Science Foundation, project no. 17-72-10122.
Аннотация: The frequencies of lattice vibrations in the RFe3(BO3)4 (R = Pr, Nd, Tb, Dy, or Ho) crystals in the high-temperature R32 phase and their temperature dependence have been calculated using the quasi-harmonic approximation. It has been found that, at the boundary point Λ of the Brillouin zone, the frequency of the unstable vibration mode the structural phase transition R32 → P3121 is related to strong changes with temperature in the TbFe3(BO3)4, DyFe3(BO3)4, and HoFe3(BO3)4 crystals. With increasing temperature, the frequency of the soft mode stabilizes and takes a real value. No significant changes in the phonon spectra, including the boundary point Λ, with increasing temperature for the PrFe3(BO3)4 and NdFe3(BO3)4 crystals have been observed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Andryushin N. D., Zinenko V. I., Pavlovskii M. S., Shinkorenko A. S.
Заглавие : Calculation and Comparison of Electronic, Vibrational, Polarization, and Magnetic Properties of Double Perovskites CaMnTi2O6 and CaFeTi2O6
Место публикации : J. Exp. Theor. Phys. - 2019. - Vol. 129, Is. 6. - P.1036-1044. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776119110013
Примечания : Cited References: 18. - This work was supported by the Russian Foundation for Basic Research (project no. 18-02-00130-a)
Аннотация: Vibrational, polarization, magnetic, and electronic properties of double perovskites CaMnTi2O6 and CaFeTi2O6 with a rare type of “column” ordering of divalent metal cations have been calculated based on the density functional theory. Analysis of the crystal lattice dynamics for paraelectric phase P42/nmc of both compounds has revealed that ferroelectric instability exists only in CaMnTi2O6. It is found that the structure distortion of the paraphrase of CaMnTi2O6 in the eigenvector of the unstable polar mode leads to a structure with the P42/nmc space group. The calculated spontaneous polarization for the ferroelectric phase of CaMnTi2O6 is Ps = 25 μC/cm2. The spin-polarization calculations have shown that the ground state is ferromagnetic in the CaFeTi2O6 crystal and antiferromagnetic in the CaMnTi2O6 crystal. The exchange interaction constants have been calculated using the Heisenberg model and the mean field approximation; the phase transition temperature for each compound has been estimated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pavlovskii M. S., Shinkorenko A. S., Zinenko V. I.
Заглавие : Calculation of lattice dynamics, elastic and dielectric properties of γ-BiB3O6 and δ-BiB3O6
Коллективы : Council on Grants from the President of the Russian Federation for Support of the "Leading Scientific Schools" [NSh-924.2014.2]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 4. - P.675-682. - ISSN 1063, DOI 10.1134/S1063783415040241. - ISSN 10906460(eISSN)
Примечания : Cited References:14. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of the "Leading Scientific Schools" (grant no. NSh-924.2014.2).
Предметные рубрики: BISMUTH BORATE BiB3O6
OPTICAL-PROPERTIES
CRYSTAL
RAMAN
Аннотация: The crystal lattice vibration frequencies, densities of phonon states, elastic moduli, and high-frequency permittivities have been calculated in terms of the density functional theory method for two polymorphs γ-BiB3O6 and δ-BiB3O6. Based on the calculated densities of phonon states, the temperature dependences of the free energies of two considered bismuth triborate modifications have been constructed, and the temperature of the phase transition between these modifications has been determined (1100 K). The structure of a possible nonpolar praphase of δ-BiB3O6 has been proposed. The polarization of δ-BiB3O6 has been estimated as 131 μC/cm2.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shinkorenko A. S., Pavlovskii M. S., Zinenko V. I.
Заглавие : Calculation of the electronic structure, lattice dynamics, and optical and magnetic properties of europium tetraborate EuB4O7
Место публикации : Phys. Solid State: Maik Nauka-Interperiodica Publishing, 2016. - Vol. 58, Is. 11. - P.2300-2306. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416110329
Примечания : Cited References: 20
Аннотация: The electronic band structure, lattice vibration frequencies, and optical and magnetic properties of EuB4O7 crystal with α-SrB4O7-type structure are calculated within the density functional method. It is found that this compound is a dielectric with a band gap of the order of 4 eV. It is found that the ground state of this crystal is the state with ferromagnetic ordering of Eu2+ spins. Exchange interaction constants are calculated; the ferromagnetic ordering temperature is estimated within the molecular field approximation (Tc ≈ 1 K). The EuB4O7 compound is a magnetic pyroelectric and, hence, can exhibit magnetoelectric properties. The calculated polarization change during ferromagnetic ordering of this crystal is 3973 μC/m2. © 2016, Pleiades Publishing, Ltd.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Shinkorenko A. S., Zinenko V. I., Pavlovsky M. S.
Заглавие : Calculation of the electronic structure, lattice dynamics, optical and magnetic properties of the tetraborate crystal EuB4O7
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P1.35. - P.96. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 3
Ключевые слова (''Своб.индексиров.''): optical properties--magnetic properties
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Eremin E. V., Veligzhanin, Alexey, Pavlovskiy M. S., Sofronova S. N., Titova, Veronika, Bezmaternykh L. N.
Заглавие : Concentration transition in Cu2(Mn,Ga)BO5 solid solutions
Колич.характеристики :13 с
Место публикации : J. Magn. Magn. Mater. - 2023. - Vol. 584. - Ст.171072. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2023.171072. - ISSN 18734766 (eISSN)
Примечания : Cited References: 27
Аннотация: The effects related to the conversion of magnetic structures of a Cu2MnBO5 ferrimagnet to a Cu2GaBO5 antiferromagnet under the Mn3+ → Ga3+ substitution were studied. The properties of four single crystal samples with the gallium concentration x = 0.04, 0.11, 0.17, 0.25 were examined. The chemical composition and valence state of the samples were determined by X-ray absorption spectroscopy element-sensitive technique. Distribution of the 3d metal ions over crystallographic positions was studied using the first principle calculations by Wien2k program. The evolution of the magnetic properties was investigated by the measurements of the temperature and field dependences of magnetization, dc and ac magnetic susceptibility. In agreement with the previous study of the structure evolution of Cu2Mn1-xGaxBO5 solid solutions, the critical concentration upon a change in the magnetic ordering type was found in the range x = 0.17–0.25. The non-monotonic behavior of magnetization in terms of the gallium content was found in the concentration range of 0.04–0.17. A complex pattern of magnetic phase transitions belonging to the concentration phase boundary was obtained in the compounds with gallium being within the range x = 0.17–0.25. One could observe the splitting of the peaks of the real part of ac-susceptibility of the high-temperature phase transition in the Cu2MnBO5-like phase (x = 0.04, 0.11) and that of the low-temperature one at the concentration boundary (x = 0.17, 0.25) with different frequency and orientational dependence. The type and origin of the multiple phase transitions observed in the studied samples were analyzed.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Eremin E. V., Molokeev M. S., Veligzhanin A. A., Pavlovsky M. S., Kuchesheva-Titova V. R., Bezmaternykh L. N., Moshkina E. M.
Заглавие : Concentrational transition in Cu2(Mn,Ga)BO5 solid solutions
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. G: Frustrated and disordered magnetism. - Ст.G.O1. - P.2-3. - ISBN 978-5-94469-051-7
Примечания : Cited References: 4. - The study was supported by the Russian Science Foundation (grant No. 21-72-00130)
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pavlovskiy M. S., Zinenko V. I., Shinkorenko A. S.
Заглавие : Effect of a rare-earth ion on the structural instability in RFe3(BO3)4 crystals
Коллективы : Russian Science Foundation [17-72-10122]
Место публикации : JETP Letters. - 2018. - Vol. 108, Is. 2. - P.116-120. - ISSN 0021-3640, DOI 10.1134/S0021364018140114. - ISSN 1090-6487(eISSN)
Примечания : Cited References: 17. - This work was supported by the Russian Science Foundation (project no. 17-72-10122).
Предметные рубрики: Iron
GdFe3(BO3)4
Аннотация: The dynamics of the crystal lattice of RFe3(BO3)4 (R = Pr, Nd, Sm, Gd, Tb, Dy, and Ho) compounds in the high-symmetry R32 phase has been calculated. Significant changes in spectra of compounds with various rare-earth ions have been obtained only near the edge Λ point of the Brillouin zone (qΛ = 1/3(−2b1 + b2 + b3, where b1, b2, and b3 are the reciprocal lattice vectors) for acoustic oscillation branches. A decrease in the frequency of an acoustic mode at the point Λ has been revealed in all studied compounds. This frequency depends on the type of rare-earth ion and decreases from a compound with Pr to a compound with Ho down to imaginary values. Such a behavior of the frequency of the unstable acoustic mode is in good agreement with experimental data on the dependence of the temperature of the R32 → P3121 structural phase transition on the type of rare-earth ion in ferroborates.
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