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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Frolov K. V., Smirnova E. S., Sidorova E. V., Alekseeva O. A., Sorokin T. A., Artemov V. V., Chmelenin D. N., Gudim I. A.
Заглавие : Structure and properties of multiferroic ferroborates of mixed composition SmFe3-xAlx(BO3)4 and Eu1-yLayFe3(BO3)4
Коллективы : Samarkand International Symposium on Magnetism, Samarkand State University
Место публикации : Book of abstacts of Samarkand International Symposium on Magnetism (SISM-2023)/ int. adv. com. S. G. Ovchinnikov [et al.]. - 2023. - Ст.3PO-L8-3. - P.195. - ISBN 978-5-00202-320-2
Примечания : Cited References: 6. - РНФ 23-22-00286
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Vtyurin A. N., Gudim I. A., Nemtsev I. V., Krylova S. N.
Заглавие : Phase diagram and soft modes behavior TbFe3–xGax(BO3)4 solid solutions with huntite structure
Колич.характеристики :9 с
Место публикации : Opt. Spectrosc. - 2023. - Vol. 131, Is. 9. - P.840-848. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X23070081. - ISSN 15626911 (eISSN)
Примечания : Cited References: 40. - The authors are grateful to the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory and the Krasnoyarsk Regional Science Foundation for funding within the framework of the scientific project, grant no. 20-42-240009 r_a_Krasnoyarsk, as well as the Russian Foundation for Basic Research and the German Scientific Research Community (Deutsche Forschungsgemeinschaft) for financial support within the project no. 21-52-12018 NNIO_a
Аннотация: The Raman spectra of four crystals of TbFe3–xGax(BO3)4 solid solutions (x from 0 to 0.54) were studied in the temperature range from 8 to 350 K. The temperatures of structural phase transitions were determined. The observed spectral behavior is characteristic to condensation and restoration of soft modes. Soft modes are associated with a structural phase transition from the R32 phase to the P3121 phase. The Compositions-Temperature phase diagram was constructed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gudim I. A., Eremin E. V., Mikhashenok N. V., Titova V. R.
Заглавие : Comparison of magnetic properties of GdFe3(BO3)4, ferroborates grown using various solvents
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 2. - P.235-239. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.02.55406.505. - ISSN 10906460 (eISSN)
Примечания : Cited References: 18. - This study was supported by grant No. 22-12-20019 provided by the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation (https://rscf.ru/project/22-72-00017/)
Аннотация: GdFe3(BO3)4, single crystals were grown from melt-solutions based on bismuth trimolybdate and lithium tungstate. Single crystals of gadolinium ferroborate from lithium-tungstate solution-melt were grown for the first time. The magnetic properties of the grown crystals are compared. It is shown that the GdFe3(BO3)4, ferroborate obtained using bismuth solution-melt trimolybdate contains impurities of Bi3+ ions (6% at.), which replace Gd3+ ions. Whereas GdFe3(BO3)4, ferroborate grown from a solution-melt based on lithium tungstate does not seem to contain such uncontrolled impurities.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krylov A. S.
Заглавие : Phase transitions in multiferroics ferroborates with huntite structure
Коллективы : Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина, Ural Federal University, "Materials science and nanotechnology", International conference
Место публикации : Materials Science and Nanotechnology (MSN-2023): abstract book of International conference/ Ural Federal University; org. com. A. N. Vtyurin et al. - Ekaterinburg, 2023. - Ст.114. - P.25. - ISBN 978-5-9500624-6-9
Примечания : Cited References: 3. - RFBR funded the reported study according to the research project № 21-52-12018
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Vtyurin A. N., Gudim I. A., Nemtsev I. V., Krylova S. N.
Заглавие : Phase diagram and soft modes behavior TbFe3–xGax(BO3)4 solid solutions with huntite structure
Колич.характеристики :8 с
Место публикации : Opt. Spectrosc. - 2022. - Vol. 130, Is. 1. - P.78-85. - ISSN 0030400X (ISSN), DOI 10.21883/EOS.2022.01.52990.38-21. - ISSN 15626911 (eISSN)
Примечания : Cited References: 40. - The authors are grateful to the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory and the Krasnoyarsk Regional Science Foundation for funding within the framework of the scientific project, grant № 20-42-240009 r a Krasnoyarsk, as well as the Russian Foundation for Basic Research and the German Scientific Research Community (Deutsche Forschungsgemeinschaft) for financial support within the project № 21-52-12018 NNIO_a
Аннотация: The Raman spectra of four crystals of TbFe3–xGax(BO3)4 solid solutions (x from 0 to 0.54) were studied in the temperature range from 8 to 350 K. The temperatures of structural phase transitions were determined. The observed spectral behavior is characteristic to condensation and restoration of soft modes. Soft modes are associated with a structural phase transition from the R32 phase to the P3121 phase. The Compositions-Temperature phase diagram was constructed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhachev A. L., Malakhovskii A. V., Nelson C. S., Gudim I. A., Temerov V. L.
Заглавие : Comparison of the absorption spectra of Nd3+ ions in the NdFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and Ho0.75Nd0.25Fe3(BO3)4 crystals
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 1. - P.113-121. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783421010200
Примечания : Cited References: 21. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: number 19-42-240003 “Influence of the local en-vironment on magneto-optical properties of f–f transitions in rare-earth aluminum and iron borates”
Аннотация: The polarized optical absorption spectra in the region of a series of the f–f transitions of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and NdFe3(BO3)4 crystals at 90 K have been compared. The spectral features related to the difference in the local environment of Nd3+ ions in these crystals have been established. In the region of the transition 4I9/2 → 4G5/2 + 2G7/2 of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4 crystal, the appearance of some absorption lines at the structural transition R32 → P3121 around ~200 K due to the local symmetry variation has been found. The intensity of these lines smoothly increases with a decrease in temperature from the transition point. The temperature dependence of the lattice parameters of the Ho0.75Nd0.25Fe3(BO3)4 crystal has been measured. It has been found that, at the transition temperature, the lattice parameter a changes stepwise, which is indicative of the occurrence of a first-order phase transition. The lattice parameter c changes smoothly.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Glamazda A. Yu., Gnezdilov V. P., Lemmens P., Zvyagina G. A., Gudim I. A.
Заглавие : Raman scattering study of the rare-earth binary ferroborate Nd0.75Dy0.25Fe3(BO3)4 single crystal
Место публикации : Физ. низких температур. - 2021. - Т. 47, Вып. 12. - С.1107-1118. - ISSN 01326414 (ISSN); Fiz. Nizk. Temp.
Примечания : Cited References: 26. - A. Yu. Glamazda thanks to Dr. A. V. Peschanskii for fruitful discussions. P. Lemmens acknowledges funding by the DFG Excellence Cluster Quantum Frontiers, EXC 2123-390837967, DFG Le967/16-1, and DFG-RTG 1952/1
Аннотация: We report comprehensive Raman scattering measurements on a single crystal of binary ferroborate Nd0.75Dy0.25Fe3(BO3)4 in the temperature range of 7–295 K with 532 nm (18797 cm–1) laser excitation. The performed analysis of the polarized Raman spectra revealed the bands assigned to phonon, magnetic, and electronic excitations. The temperature evolution of these quasiparticle excitations has allowed us to ascertain the intricate coupling and interplay between lattice, magnetic, and electronic degrees of freedom. Analysis of the measured Raman spectra made it possible to identify all A1 and Е phonon modes of predicted by the group-theoretical analysis. The splitting energies between the LO and TO components of the polar E phonons were determined. Below the magnetic ordering temperature of the Fe sublattice, TN, we have revealed a multiple peaked two-magnon excitation. Analyzing the temperature evolution of low-frequency modes in the spectra, we also identi-fied modes that are associated with electronic transitions between the crystal field levels of the Nd3+ ions with ground-state 4I9/2 and of the Dy3+ ions with ground-state 6H15/2 multiplets. In addition to the already known temperatures of magnetic transitions, analysis of the temperature behavior of low-frequency phonon and electronic excitations made it possible to establish a temperature T * = 100 K, presumably associated with local distortions of the crystal lattice. The presence of this temperature is confirmed by our ultrasonic study. A group of intense bands observed in the frequency range of 1700–2200 cm–1 has been associated with the mixed low-lying electronic Raman transitions 4I9/2→4I11/2 and the high-energy luminescence ones 4G5/2+2G7/2→4I9/2 for the Nd3+ ion.Представлено результати раманівських досліджень монокристала бінарного фероборату Nd0,75Dy0,25Fe3(BO3)4 при лазерному збудженні 532 нм (18797 см–1) в діапазоні температур 7–295 K. Аналіз отриманих поляризованих раманівських спектрів виявив смуги, які були віднесені до фононних, магнітних та електронних збуджень. На підставі температурної еволюції смуг встановлено складний зв’язок та взаємодію між гратковими, магнітними й електронними ступенями свободи. Аналіз отриманих спектрів дозволив виявити всі А1 та Е фононні моди, передбачені груповим теоретичним аналізом. Визначено енергії розщеплення між LO і TO компонентами полярних E-фононів. Нижче температури магнітного впорядкування Fe-підгратки, TN, виявлена складна багатопікова смуга, яка віднесена до двомагнонного збудження.Температурна залежність низькочастотних раманівських спектрів виявила моди, пов’язані з електронними переходами між рівнями мультиплетів 4I9/2 основного стану Nd3+ та 6H15/2 основного стану Dy3+, отримані в результаті дії кристалічного поля. Аналіз температурної поведінки низькочастотних фононних та електронних збуджень дозволив встановити аномалію поблизу T * = 100 K, ймовірно, пов’язану з локальними спотвореннями кристалічної гратки. Наявність цієї температури підтверджується ультразвуковими дослідженнями. Група інтенсивних смуг, що спостерігається в раманівському спектрі в діапазоні частот 1700–2200 см–1, пов’язана зі змішаними низько розташованими електронними раманівськими 4I9/2 → 4I11/2 та високоенергетичними люмінесцентними 4G5/2 + 2G7/2→4I9/2 переходами в Nd3+ іоні.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov V. V., Gudim I. A.
Заглавие : Magnetic circular dichroism and absorption spectra of f–f transitions 5I8 → 5F2 and 5F3 in the HoFe3(BO3)4 single crystal
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-02-00034]; Krasnoyarsk Krai Russian Foundation for Basic Research; Krasnoyarsk Krai Regional Fund of Science [19-42-240003]
Место публикации : Low Temp. Phys. - 2020. - Vol. 46, Is. 7. - P.734-739. - ISSN 1063-777X, DOI 10.1063/10.0001371. - ISSN 1090-6517(eISSN)
Примечания : Cited References: 16. - The study was supported by the Russian Foundation for Basic Research, grant No. 19-02-00034, and also by the Krasnoyarsk Krai Russian Foundation for Basic Research and the Krasnoyarsk Krai Regional Fund of Science as part of project No. 19-42-240003 on "The influence of the local environment on the magneto-optical properties of f-f transitions in rare-earth aluminoborates and ferroborates"
Предметные рубрики: MAGNETOOPTICAL ACTIVITY
ELECTRON-STRUCTURE
ERFE3(BO3)4
Аннотация: Magnetic circular dichroism (MCD) and absorption spectra of multiferroic HoFe3(BO3)4 of 5I8 → 5F2 and 5F3 f–f transitions are measured at T = 90 K. The absorption spectra are expanded into Lorentzian components, and the transition intensities are obtained. The Zeeman splitting of some transitions is determined using the MCD and absorption spectra. The MCD spectra and Zeeman splitting are theoretically analyzed in the free-atom |J, ±MJ〉wave function approximation by using the concept of a crystalline quantum number. An inconsistency is revealed when this concept is applied to ions with an integer moment, and a modification of the concept is proposed. Anomalously intense vibronic repetitions of electronic transitions from excited sublevels of the ground multiplet are found.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sokolov V. V., Malakhovskii A. V., Sukhachev A. L., Gudim I. A.
Заглавие : Paramagnetic magneto-optical activity of f-f transitions in HoFe3(BO3)4 and HoAl3(BO3)4 single crystals
Место публикации : Opt Mater. - 2019. - Vol. 94. - P.35-40. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2019.05.024
Примечания : Cited References: 38. - The work was supported by the Russian Foundation for Basic Researches grant 19-02-00034.
Аннотация: Absorption and magnetic circular dichroism (MCD) spectra of HoFe3(BO3)4 and HoAl3(BO3)4 single crystals were measured as a function of temperature in the range of 90–293 K. Based on integrals of f-f absorption and МСD bands, temperature dependences of the paramagnetic magneto-optical activity (MOA) of f-f transitions were obtained for the first time. It was revealed that MOA of the same f-f transitions in the studied crystals were substantially different and their temperature dependences did not follow the Curie-Weiss law in contrast to the properties of allowed transitions. The observed phenomena were accounted for as a consequence of the nature of f-f transitions allowance. In temperature dependences of the MOA of two transitions the singularities were revealed, which indicated to some local structural distortions in the corresponding excited states.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Gudim I. A., Temerov V. L., Krylov A. S.
Заглавие : Temperature-dependent absorption lines observation in Raman spectra of SmFe3 (BO3)4 ferroborate
Коллективы : RFBR [18-02-00696, 18-02-00754]
Место публикации : J. Raman Spectrosc. - 2018. - Vol. 49, Is. 10. - P.1732-1735. - ISSN 0377-0486, DOI 10.1002/jrs.5430. - ISSN 1097-4555(eISSN)
Примечания : Cited References: 12. - RFBR, Grant/Award Numbers: 18-02-00696 and 18-02-00754
Предметные рубрики: SmFe3 (BO3)4
Ho1-xNdxFe3(BO3)4
CRYSTALS
Ключевые слова (''Своб.индексиров.''): absorption--ferroborates--huntite--level splitting--magnetic phase--transitions
Аннотация: The paper demonstrates possibilities of observation and thermal dependency study of the absorption lines as a co‐product of Raman spectroscopy study in SmFe3 (BO3)4 ferroborate. Raman spectra of the ferroborate were studied in a wide temperature range (T = 10÷300 K). Temperature‐dependent absorption lines sensitive to the magnetic phase transition have been observed in Raman spectra at two spectral ranges.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhachev A. L., Malakhovskii A. V., Aleksandrovsky A. S., Gudim I. A., Temerov V. L.
Заглавие : Spectroscopic properties of HoFe3(BO3)4, NdFe3(BO3)4 and Ho0.75Nd0.25Fe3(BO3)4 single crystals
Место публикации : Opt. Mater. - 2018. - Vol. 83. - P.87-92. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2018.05.078
Примечания : Cited References: 39. - A.L. Sukhachev thanks for support Project of Russian Academy of Science No. 0356-2017-0030. A.V. Malakhovskii thanks Russian Foundation for Basic Researches (RFBR) Grant No. 16-02-00273. A.S. Aleksandrovsky thanks RFBR Grant No. 17-52-53031. I.A. Gudim and V.L. Temerov thank RFBR Grant No. 17-52-45091.
Ключевые слова (''Своб.индексиров.''): holmium and neodymium ferroborates--judd–ofelt parameters
Аннотация: Polarized absorption spectra of ferroborates HoFe3(BO3)4, NdFe3(BO3)4 and Ho0.75Nd0.25Fe3(BO3)4 were measured at room temperature in spectral range 4000–24500 cm−1 (400–2500 nm). The studied single crystals were grown from solution-melts. Intensities of the f-f transitions were measured and the Judd–Ofelt parameters Ωλ of Ho3+ and Nd3+ ions in the studied crystals were calculated. It was revealed that the crystals content not strongly influences the Judd–Ofelt parameters. The Ω2 parameter for Ho3+ ion is the most sensitive to the crystal content. Linear dichroism of the hypersensitive transitions appeared to be the largest one for both rare earth ions.
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12.

13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Gudim I. A., Temerov V. L.
Заглавие : Local properties of rare earth ferroborates in the optically excited states
Коллективы : International Feofilov Symposium on spectroscopy of crystals doped with rare earth and transition metal ions
Место публикации : XVII International Feofilov Symposium on spectroscopy of crystals doped with rare earth and transition metal ions (IFS'XVII): book of abstracts. - 2018. - P.209-210
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov V. V., Gudim I. A.
Заглавие : Influence of the low local symmetry of Er3+ ions on magnetic circular dichroism and absorption spectra of f-f transitions in ErFe3(BO3)4 single crystal
Место публикации : J. Magn. Magn. Mater. - 2018. - Vol. 465. - P.700-708. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2018.06.057
Примечания : Cited References: 29. - The work was supported by the Russian Foundation for Basic Researches grant 16-02-00273 and by the Project of Russian Academy of Science No. 0356-2017-0030.
Ключевые слова (''Своб.индексиров.''): er3+ ion--f-f transitions--magnetic circular dichroism--rare earth ferroborates
Аннотация: Linearly polarized absorption spectra and magnetic circular dichroism (MCD) spectra of ErFe3(BO3)4 single crystal were measured in the range of 9000–23000 cm−1 at 90 K. The absorption spectra of f-f transitions were decomposed into the Lorentz shape components and intensities of the components were found. MCD spectra permitted us to measure the Zeeman splitting of some transitions and so to determine changes of the Landé factor along the C3 axis of the crystal during these transitions. Optical and magneto-optical properties of f-f transitions in the ErFe3(BO3)4 crystal were compared with those in the ErAl3(BO3)4 crystal. Substantial difference of the properties connected with the difference of the Er3+ ions local symmetry in two crystals was revealed. Large splitting of one of the f-f transitions without magnetic field, which is not possible for the Kramers doublets, was observed. It was explained by appearance of two absorbing centers due to the local decrease of symmetry in the excited state. Appreciable difference of the local vibrations energy in some excited states was revealed.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gudim I. A., Titova, Veronika
Заглавие : Growth of single crystals of trigonal ferroborates (Ho1- xNdx)Fe3(BO3)4 with the huntite structure depending on the crystallochemical growth conditions
Коллективы : Байкальская международная конференция "Магнитные материалы. Новые технологии", "Магнитные материалы. Новые технологии", Байкальская международная конференция, "Magnetic materials. New tecnologies", Baikal International Conference, Иркутский государственный университет
Место публикации : Магнитные материалы. Новые технологии: тез. докл. VIII Байкал. междунар. конф. BICMM-2018/ чл. прогр. ком. R. S. Iskhakov [et al.]. - Иркутск, 2018. - P.189. - ISBN 978-5-00133-051-6
Примечания : Библиогр.: 2
РИНЦ,
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Gudim, I. A., Nemtsev I. V., Krylova S. N., Shabanov A. V., Krylov A. A.
Заглавие : Raman study of HoFe3(BO3)4 at simultaneously high pressure and high temperature: p–T phase diagram
Коллективы : International GeoRAMAN Conference
Место публикации : J. Raman Spectrosc. - 2017. - Vol. 48, Is. 11. - P.1406-1410. - ISSN 0377-0486, DOI 10.1002/jrs.5078. - ISSN 1097-4555(eISSN)
Примечания : Cited References:35. - Authors are grateful to Prof. A.N. Vtyurin for his valuable discussion. This work was supported by the Russian Foundation for Basic Research (grant no. 17-02-00694)
Предметные рубрики: HYDRATE FORMATION
SINGLE-CRYSTALS
WATER SYSTEM
TRANSITIONS
Ключевые слова (''Своб.индексиров.''): phase transitions--high hydrostatic pressure--ferroborates--p-t phase--diagram--nanocrystal
Аннотация: Raman spectra of a HoFe3(BO3)4 crystal chip has been investigated at simultaneously high temperature and high pressure (up to 7.1 GPa and 560 K). On the basis of Raman analysis, the assignment to one of the two possible crystal phases has been made. The experimental p–T phase diagram of HoFe3(BO3)4 was established. An increase in the pressure leads to an increase in the temperature of transition. The phase boundary equation was obtained. Neither triple points nor a phase with new symmetry was revealed in the phase diagram. A critical point with the temperature T = 560 K and the pressure p = 2.53 GPa was found. The nanocrystals with different shapes began to grow on crystal surface after reaching that point. The composition of new nanocrystals is identical to the composition of initial crystal.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Moshkina E. M., Sofronova S. N., Gudim, I. A., Temerov V. L., Vtyurin A. N.
Заглавие : Low-temperature features of Raman spectra below magnetic transitions in multiferroic Ho1–xNdxFe3(BO3)4 and Sm1–yLayFe3(BO3)4 single crystals
Место публикации : Ferroelectrics: Taylor & Francis, 2017. - Vol. 509, Is. 1. - P.92-96. - ISSN 00150193 (ISSN), DOI 10.1080/00150193.2017.1294040
Примечания : Cited References: 12
Ключевые слова (''Своб.индексиров.''): raman spectra--magnetic ordering--huntite--rare-earth ferroborates
Аннотация: Raman spectra changes in multiferroic Ho1–xNdxFe3(BO3)4 (x = 0, 0.25, 0.5, 0.75) and Sm1–yLayFe3(BO3)4 (y = 0, 0.75) single crystals at low temperatures have been analyzed. The anomalies corresponding to the phase transition of the second order have been detected at the temperatures of magnetic phase transitions, being consistent with previously reported results of the magnetization study. A number of anomalies in the temperature dependences of the spectral lines associated with the occurrence of magnetic order. A mode corresponding to two-magnon scattering was revealed. Comparison of the features of low-temperature low-frequency spectra of solid solutions Ho-Nd and Sm-La has been carried out.
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bilych I. V., Zhekov K. R., Gaydamak T. N., Burma N. G., Kolodyazhnaya M. P., Zvyagina G. A., Fil' V. D., Gudim, I. A.
Заглавие : Magnetopiezoelectric effects in easy plane ferroborates
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.4PO-J-46. - P.925 (Шифр 29916280)
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Demidov A. A., Ritter C., Velikanov D. A., Semenov S. V., Tugarinov V. I., Temerov V. L., Gudim, I. A.
Заглавие : Transformation from an easy-plane to an easy-axis antiferromagnetic structure in the mixed rare-earth ferroborates PrxY1-xFe3(BO3)4: Magnetic properties and crystal field calculations
Место публикации : J. Phys.: Condens. Matter: IOP Publishing, 2016. - Vol. 28, Is. 39. - Ст.396001. - ISSN 09538984 (ISSN), DOI 10.1088/0953-8984/28/39/396001
Примечания : Cited References: 27. - This work was supported by the Russian Foundation for Basic Research (project no. 15-42-04186_r_sibir'_a).
Ключевые слова (''Своб.индексиров.''): magnetic phase transitions--rare-earth ferroborates rfe3(bo3)4--antiferromagnetic resonance
Аннотация: The magnetic structure of the mixed rare-earth system PrxY1-xFe3(BO3)4 (x = 0.75, 0.67, 0.55, 0.45, 0.25) was studied via magnetic and resonance measurements. These data evidence the successive spin reorientation from the easy-axis antiferromagnetic structure formed in PrFe3(BO3)4 to the easy-plane one of YFe3(BO3)4 associated with the weakening of the magnetic anisotropy of the Pr subsystem due to its diamagnetic dilution by nonmagnetic Y. This reorientation occurs through the formation of an inclined magnetic structure, as was confirmed by our previous neutron research in the range of x = 0.67 ? 0.45. In the compounds with x = 0.75 and 0.67 whose magnetic structure is close to the easy-axis one, a two-step spin reorientation takes place in the magnetic field H||c. Such a peculiarity is explained by the formation of an interjacent inclined magnetic structure with magnetic moments of Fe ions located closer to the basal plane than in the initial state, with these intermediate states remaining stable in some ranges of the magnetic field. An approach based on a crystal field model for the Pr3+ ion and the molecular-field approximation is used to describe the magnetic characteristics of the system PrxY1-xFe3(BO3)4. With the parameters of the d-d and f-d exchange interactions, of the magnetic anisotropy of the iron subsystem and of the crystal field parameters of praseodymium thus determined, it is possible to achieve a good agreement between the experimental and calculated temperature and field dependences of the magnetization curves (up to 90 kOe) and magnetic susceptibilities (2-300 K). © 2016 IOP Publishing Ltd.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Krylov A. S., Sofronova S. N., Gudim, I. A., Temerov V. L.
Заглавие : Crystal growth and Raman spectroscopy study of Sm1-xLaxFe3(BO3)4 ferroborates
Место публикации : Cryst. Growth Des.: American Chemical Society, 2016. - Vol. 16, Is. 12. - P.6915-6921. - ISSN 15287483 (ISSN), DOI 10.1021/acs.cgd.6b01079
Примечания : Cited References: 17. - This work was supported by the Russian Foundation for Basic Research, Project No. 14-02-00307.
Ключевые слова (''Своб.индексиров.''): 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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