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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Boldyrev K. N., Popova M. N., Bezmaternykh L. N., Gudim, I. A.
Заглавие : Uncontrolled impurity of Bi3+ in rare-earth iron borates RFe3(BO3)4
Коллективы : International Conference on the Physics of Optical Materials and Devices
Место публикации : The 4th International Conference on the Physics of Optical Materials and Devices. ICOM 2015: book of abstracts. - 2015. - P.262. - ISBN 978-86-7306-134-4
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Boldyrev K. N., Molchanova A. D., Moshkina E. M.
Заглавие : The electronic and magnetic structures of manganese doped copper metaborate Cu0.98Mn0.02B2O4
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.4OR-O-11. - P.752 (Шифр 29916280)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boldyrev K. N., Stanislavchuk T. N., Klimin S. A., Popova M. N., Bezmaternykh L. N.
Заглавие : Terahertz spectroscopy of multiferroic EuFe3(BO3)4
Место публикации : Phys. Lett. A: Elsevier Science BV, 2012. - Vol. 376, Is. 37. - P.2562-2564. - ISSN 0375-9601, DOI 10.1016/j.physleta.2012.06.028
Примечания : Cited References: 19. - This work was partially supported by the Russian Foundation for Basic Research under Grants No. 10-02-01071-a and No. 09-02-00171-a, by the Ministry of Education and Science under Grant HIII-4828.2012.2, and by the Russian Academy of Sciences under the programs for basic research.
Предметные рубрики: SINGLE-CRYSTAL
GDFE3(BO3)4
Ключевые слова (''Своб.индексиров.''): terahertz spectroscopy--multiferroics--europium iron borate
Аннотация: The terahertz spectra of a rare-earth iron borate with the huntite structure are obtained for the first time. We study the low-temperature (4.0–90 K) α-polarized transmittance spectra of the EuFe3(BO3)4 single crystal in the region 0.9–6.0 THz. Pronounced shifts of phonon frequencies and appearance of new phonon modes at the temperature T S = 58 K of the R 32 → P 3 1 21 structural phase transition are observed. Additional shifts of phonon frequencies occur at the temperature T N = 34 K of the magnetic ordering of the Fe subsystem, thus evidencing the spin–phonon coupling in this multiferroic material.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kuzmenko A. M., Mukhin A. A., Ivanov V. Yu., Shuvaev A., Dziom V., Pimenov A., Boldyrev K. N., Bezmaternykh L. N., Gudim, I. A.
Заглавие : Terahertz optical activity at crystal field transitions in Tm3+ Ions in magnetoelectric alumoborates
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-33. - P.912 (Шифр 29916280)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Molchanova A. D., Moshkina E. M., Molokeev M. S., Tropina E. V., Bovina A. F., Boldyrev K. N.
Заглавие : Synthesis and optical properties of nickel-doped copper metaborate crystals
Место публикации : Opt. Spectrosc. - 2022. - Vol. 130, Is. 1. - P.105-109. - ISSN 0030400X (ISSN), DOI 10.21883/EOS.2022.01.52994.41-21. - ISSN 15626911 (eISSN)
Примечания : Cited References: 18. - The study was performed with the support of Russian Science Foundation, RSF grant № 19-12-00413
Аннотация: This work presents information on the growth and spectroscopic study of single crystals of copper metaborate doped with nickel Cu1–xNixB2O4 (x = 0.05, 0.1). In the absorption spectra of both crystals, satellites related to Cu centers distorted by impurity Ni atoms were observed near the lines of zero phonon transitions. Polarization studies in the isotropic ab-plane of the tetragonal crystal Cu1–xNixB2O4 show the presence of linear magnetic dichroism in the magnetically ordered state, which was previously observed both in manganese-doped and undoped copper metaborates CuB2O4. The temperature of magnetic phase transitions into the collinear antiferromagnetic and into helicoidal structures, TN = 19.1 K and T* = 8.6 K, respectively, were determined from the temperature dependence of the dichroic signal.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Molchanova A. D., Moshkina E. M., Molokeev M. S., Tropina E. V., Bovina A. F., Boldyrev K. N.
Заглавие : Synthesis and optical properties of nickel-doped copper metaborate crystals
Колич.характеристики :6 с
Место публикации : Opt. Spectrosc. - 2023. - Vol. 131, Is. 8. - P.717-722. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X23060127. - ISSN 15626911 (eISSN)
Примечания : Cited References: 18. - The study was performed with the support of Russian Science Foundation, RSF grant no. 19-12-00413
Аннотация: This work presents information on the growth and spectroscopic study of single crystals of copper metaborate doped with nickel Cu1–xNixB2O4 (x = 0.05, 0.1). In the absorption spectra of both crystals, satellites related to Cu centers distorted by impurity Ni atoms were observed near the lines of zero phonon transitions. Polarization studies in the isotropic ab-plane of the tetragonal crystal Cu1–xNixB2O4 show the presence of linear magnetic dichroism in the magnetically ordered state, which was previously observed both in manganese-doped and undoped copper metaborates CuB2O4. The temperature of magnetic phase transitions into the collinear antiferromagnetic and into helicoidal structures, TN = 19.1 K and T * = 8.6 K, respectively, were determined from the temperature dependence of the dichroic signal.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Boldyrev K. N., Popova M. N., Stanislavchuk T. N., Sirenko A. A., Bezmaternykh L. N.
Заглавие : Spin-phonon and electron-phonon interactions in multiferroic RFe3(BO3)4 probed by terahertz spectroscopy
Коллективы : International Feofilov symposium on spectroscopy of crystals doped with rare earth and transition metal ions
Место публикации : XV Int. Feofilov symp. on spectroscopy of crystals doped with rare earth and transition metal ions. - Kazan, 2013. - Ст.PI_6. - P.114
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Chukalina E. P., Boldyrev K. N., Stanislavchuk T. N., Malkin B. Z., Gudim I. A.
Заглавие : Spectroscopy of f-f transitions, crystal-field calculations, and magnetic and quadrupole helix chirality in DyFe3(BO3)4 [Electronic resource]
Место публикации : ArXiv. - 2016. - Ст.1611.07092
Вид и объем ресурса: Electronic text data
Примечания : 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Chukalina E. P., Boldyrev K. N., Stanislavchuk T. N., Malkin B. Z., Gudim I. A.
Заглавие : Spectroscopy of f-f transitions, crystal-field calculations, and magnetic and quadrupole helix chirality in DyFe3(BO3)4
Место публикации : Phys. Rev. B: American Physical Society, 2017. - Vol. 95, Is. 12. - Ст.125131. - ISSN 10980121 (ISSN), DOI 10.1103/PhysRevB.95.125131
Примечания : 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.
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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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Molchanova A. D., Boldyrev K. N., Moshkina E. M.
Заглавие : Spectroscopic study and analysis of d-d transitions in Ni ions in nickel orthoborate (Cu, Ni)B2O4
Коллективы : International Baltic Conference on Magnetism: focus on nanobiomedicine and smart materials, Балтийский федеральный университет им. И. Канта
Место публикации : 4th International Baltic Conference on Magnetism (IBCM 2021): Book of abstracts. - 2021. - P.165
Примечания : Cited References: 7. - This work was supported by the Russian Science Foundation, grant № 19-12-00413
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Boldyrev K. N., Klimin S. A., Stanislavchuk T. N., Sirenko A. A., Bezmaternykh L. N.
Заглавие : Spectral signatures of spin-phonon and electron-phonon interactions in multiferroic iron borates
Коллективы : Moscow International Symposium on Magnetism , Russian Science Foundation [14-12-01033], U.S. Department of Energy [DE-FG02-07ER46382, DE-AC02-98CH10886]
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2015. - Vol. 383. - P.250-254. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2014.10.095. - ISSN 1873-4766 (eISSN)
Примечания : Cited References:32. - This work was supported by the Russian Science Foundation (Grant no. 14-12-01033). Experiments at U4-IR beamline NSLS-BNL (T.N.S. and A.A.S.) were performed under Contract no. DE-FG02-07ER46382 from the U.S. Department of Energy. The National Synchrotron Light Source is operated as a User Facility for the U.S. Department of Energy under Contract no. DE-AC02-98CH10886. M.N.P. thanks B.Z. Malkin for helpful discussions.
Предметные рубрики: SMFE3(BO3)4
SPECTROSCOPY
CRYSTALS
SM
Ключевые слова (''Своб.индексиров.''): rare-earth iron borates--spin phonon interactions--electron phonon coupling--optical spectroscopy
Аннотация: High-resolution far-infrared reflection and polarized ellipsometry, as well as Raman scattering temperature-dependent measurements are used to study spin-phonon and electron-phonon interactions in rare-earth (RE) iron borates with the R32 structure of a natural mineral huntite, namely, in RFe3(BO3)4 with R=Pr, Nd, and Sm. Pronounced peculiarities in the ω(T) dependences at the Néel temperature TN≈32 K are observed for all the compounds studied and the origin of these peculiarities is discussed. A coupling between lattice phonons and crystal-field excitations of a RE ion manifests itself by a renormalization of frequencies and intensities of coupled modes. Modeling of the spectra has revealed the value of about 15 cm−1 for the electron–phonon coupling constant in PrFe3(BO3)4.Высокоразрешающая эллипсометрия дальнего инфракрасного отражения и поляризованный света, а также температурнозависимые измерения комбинационного рассеяния используются для изучения спин-фононных и электрон-фононных взаимодействий в редкоземельных (RE) боратах железа со структурой R32 природного минерала хантита , а именно, в RFe3 (BO3) 4 с R = Pr, Nd, и Sm. Выраженные особенности ω (T) зависимостей при температуре Нееля TN ≈32 K наблюдаются для всех исследованных соединений и происхождение этих особенностей обсуждается.Связь между фононами решетки и возбуждениями кристаллического поля РЗ иона проявляется себя перенормализации частоты и интенсивности связанных мод. Моделирование спектров показал значение около 15cm-1 для константы электрон-фононной связи в PrFe3 (BO3) 4.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boldyrev K. N., Burlakov V. M., Gudim I. A., Gavrilkin S. Y., Popova M. N.
Заглавие : Regulation of the phase transition temperature and hysteresis width by changing the composition of solid solution
Место публикации : Phys. Rev. Mater. - 2021. - Vol. 5, Is. 9. - Ст.094414. - ISSN 24759953 (ISSN), DOI 10.1103/PhysRevMaterials.5.094414
Примечания : Cited References: 52. - This work is supported by the Russian Science Foundation under Grant No. 19-12-00413
Аннотация: A detailed study of the structural phase transition in Eu1–xLaxFe3(BO3)4 mixed crystals as a function of composition is reported. By analyzing a frequency shift of an electronic f-f transition in high-resolution optical spectra of Eu3+ ions, we detected a decrease in the phase transition temperature Ts from 87.05 to 12.2 K (upon cooling) and a simultaneous increase in thermal hysteresis ΔTs from 0.29 to 4.7 K with increasing x from x=0 to x=0.12. A rectangular hysteresis loop was observed. The experimental Ts(x) and ΔTs(x) dependences are described within the developed analytical model utilizing linear decrease in Ts with x and treating the increase in ΔTs in terms of the impurity-related decrease in the interaction between some local order parameters. We argue that R1−xR′xFe3(BO3)4 solid solutions, where R and R′ are different rare-earth elements, can be used to implement optical storage devices and switches operating at any chosen temperature between 0 and 450 K. It is found that the changes in the composition and, correspondingly, structural phase transition parameters do not affect the magnetic phase transformation. Eu0.88La0.12Fe3(BO3)4 demonstrates the structural phase transition at about 12 K, well below the Néel temperature TN=32K.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boldyrev K. N., Popova M. N., Bettinelli M., Temerov V. L., Gudim, Irina A., Bezmaternykh L. N., Loiseau P., Aka G., Leonyuk N. I.
Заглавие : Quality of the rare earth aluminum borate crystals for laser applications, probed by high-resolution spectroscopy of the Yb3+ ion
Место публикации : Opt. Mater.: Elsevier Science BV, 2012. - Vol. 34, Is. 11. - P.1885-1889. - ISSN 0925-3467, DOI 10.1016/j.optmat.2012.05.021
Примечания : Cited References: 20. - This work was supported by the Russian Academy of Sciences under the Programs for Basic Research, the Russian Foundation for Basic research under Grants No 10-02-01071-a and No 09-02-00171-a, and by the Ministry of Education and Science under Grant HIII-4828.2012.2.
Предметные рубрики: GROWTH
Y1-XYBXAL3(BO3)4
LUMINESCENCE
FREQUENCY
CENTERS
Ключевые слова (''Своб.индексиров.''): ytterbium--aluminum borates--impurities--high-resolution spectroscopy--uv edge
Аннотация: A comparative study was performed of the low-temperature high-resolution absorption spectra of the Yb3+ probe in R1−xYbxAl3(BO3)4 (R = Y, Tm, Lu) crystals grown by flux technique independently in four different laboratories using different solvents. We show that the incorporation of solvent components into the crystal in the course of crystallization gives rise to spectral satellites of the Yb3+ 0(2F7/2) → 0′(2F5/2) absorption lines and assign particular satellites to the Yb3+ centers near the bismuth and molybdenum impurities (which decrease the transparency of YAB in the UV spectral range). We suggest this spectroscopic method for a rapid analysis of the quality of UV laser crystals and for improvement of growth technologies.
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Boldyrev K. N., Popova M. N., Bezmaternykh L. N., Pisarev R. V.
Заглавие : Pronounced coupling of 3D-excitons with magnetic phase transitions in CuB2O4
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова
Место публикации : Moscow int. Symp. on Magnet. (MISM-2014): Book of abstracts. - 2014. - Ст.2OR-H-4. - P.697. - ISBN 978-5-91978-025-0
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boldyrev K. N., Diab M., Gudim I. A., Popova M. N.
Заглавие : Optical linear dichroism in the ab-plane of NdFe3(BO3)4 ferroborate
Колич.характеристики :6 с
Место публикации : J. Exp. Theor. Phys. - 2023. - Vol. 137, Is. 4: Special Issue dedicated to the 95th Anniversary of L. A. Prozorova. - P.486-491. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776123100011. - ISSN 10906509 (eISSN)
Примечания : Cited References: 16. - This study was supported by the Ministry of Science and Higher Education (project no. FFUU-2022-0003) and partially (K.N. B., dichroism measurements) by the Russian Science Foundation (grant no. 19-72-10132P)
Аннотация: The high-resolution optical absorption spectra of NdFe3(BO3)4 single crystals have been recorded at temperatures from 4 to 40 K in the IR range of f–f transitions in a Nd3+ ion. Light linearly polarized at different angles to the C2 axes in the basal plane has been passed along the trigonal C3 axis. Below the temperature of magnetic moment ordering into a collinear antiferromagnetic structure (TN ≈ 30 K), dichroism, that is, the absorption versus polarization dependence, arises. The temperature and angular dependences of dichroism indicate that the magnetic moments of iron are directed along the C2 axes up to about 17 K, the number of domains with variously directed C2 axes being different. The mechanism of linear dichroism has been discussed. Below 17 K, a smooth transition to the helicoidal magnetic phase has been observed, with the collinear phase coexisting with the helicoidal one. Data presented in this article contradict the earlier concept of magnetic moments fluctuating in the low-temperature phase near the C2 axis within the ±10° interval.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boldyrev K. N., Popova M. N., Molchanova A. D., Stanislavchuk T. N., Bezmaternykh L. N., Gudim, I. A.
Заглавие : Multifunctional RFe3(BO3)4 materials: Quality control
Коллективы : International Workshop on Quantum Optics
Место публикации : EPJ Web of Conf./ ed. V. V. Samartsev [et al.]. - 2015. - Vol. 103. - Ст.09001. - ISSN 2100-014X, DOI 10.1051/epjconf/201510309001
Примечания : Cited References: 3. - This work was supported by the Russian Science Foundation (Grant № 14-12-01033)
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Gudim, I. A., Eremin E. V., Begunov A. I., Demidov A. A., Boldyrev K. N.
Заглавие : Magnetization, magnetoelectric polarization, and specific heat of HoGa3(BO3)4
Коллективы : Russian Foundation for Basic Research [13-02-12442-ofi_m2]; Council of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [MK-1700.2013.2]
Место публикации : JETP Letters. - 2014. - Vol. 99, Is. 2. - P.67-75. - ISSN 0021-3640, DOI 10.1134/S0021364014020106. - ISSN 1090-6487
Примечания : Cited References: 28. - This work was supported by the Russian Foundation for Basic Research (project no. 13-02-12442-ofi_m2). K.N.B. also acknowledges the support from the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-1700.2013.2).
Предметные рубрики: HoAl3(BO3)4
Аннотация: A comprehensive experimental and theoretical study of magnetic, magnetoelectric, thermal, and spectroscopic characteristics of HoGa3(BO3)4 gallium borate single crystals has been performed. A large magnetoelectric effect exceeding its values found in all iron and aluminum borates except HoAl3(BO3)4 has been observed. The magnetoelectric polarization of HoGa3(BO3)4 equals ΔP ba (B a ) ≈ −1020 μC/m2 at T = 5 K in a magnetic field of 9 T. The theoretical treatment based on the crystal field model for rare-earth ions provides a unified approach for the consistent interpretation of all measured characteristics. The crystal-field parameters are determined. The temperature (in the 3–300 K range) and magnetic field (up to 9 T) dependences of the magnetization, the Schottky anomaly in the temperature dependence of the specific heat, and its shift in the field B || c are described. To compare the thermal properties of HoGa3(BO3)4 with those of HoAl3(BO3)4 exhibiting record values of the polarization, the specific heat of HoAl3(BO3)4 at various B values and the temperature dependence of the polarization ΔP b (T) in the applied magnetic field of 9 T have been measured.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Demidov A. A., Volkov D. V., Gudim I. A., Eremin E. V., Boldyrev K. N.
Заглавие : Magnetic, magnetoelastic, and spectroscopic properties of TmAl3(BO3)4
Коллективы : Russian Foundation for Basic Research [13-02-12442ofi_m2]; Russian Federation [MK-1700.2013.2]
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 119, Is. 4. - P.737-744. - ISSN 1063-7761, DOI 10.1134/S106377611410015X. - ISSN 1090-6509
Примечания : Cited References: 28. - This study was supported financially by the Russian Foundation for Basic Research (project no. 13-02-12442ofi_m2) and (K.N.B.) by the grant no. MK-1700.2013.2 from the President of the Russian Federation.
Предметные рубрики: THERMAL-EXPANSION
CRYSTALS
MAGNETOSTRICTION
HoAl3(BO3)4
GARNETS
Аннотация: The thermodynamic properties of alumoborate TmAl3(BO3)4 single crystal are studied experimentally and theoretically. A theoretical analysis based on the crystal field model makes it possible to interpret all measured parameters. The crystal field parameters are determined. The temperature (3–300 K) and field (up to 9 T) dependences of magnetization are described. The field and temperature dependences of multipole moments of the Tm3+ ion in TmAl3(BO3)4 make it possible to describe magnetostriction and low-temperature anomalies in thermal expansion.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova E. A., Chukalina E. P., Boldyrev K. N., Jablunovskis A., Gudim I. A.
Заглавие : Magnetic structure of ErFe3(BO3)4: Spectroscopic and thermodynamic studies
Место публикации : J. Magn. Magn. Mater. - 2020. - Vol. 500. - Ст.166374. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2019.166374
Примечания : Cited References: 14. - E.P.Ch., and K.N.B. acknowledge a financial support of the Russian Science Foundation under Grant # 19-12-00413. The calculational part of the article was prepared by . E.A.P. within the framework of the Academic Fund Program at the National Research University Higher School of Economics (HSE University) in 2019 (grant №19-04-030) and by the Russian Academic Excellence Project «5-100»
Аннотация: We report on the high-resolution spectroscopic study of multiferroic ErFe3(BO3)4. The energies of all eight Kramers doublets of the ground 4I15/2 multiplet of the Er3+ ion were determined by the high-resolution 4I13/2 → 4I15/2 infrared luminescence spectra. The spectroscopically determined temperature dependence of the splitting of the ground Kramers doublet was used to calculate the contribution of the erbium subsystem into the specific heat and the magnetic susceptibility of erbium iron borate. The analysis of the thermodynamic properties based on these calculations allowed us to suggest the domain structure in the easy-plane antiferromagnetically ordered iron subsystem, with two magnetically nonequivalent erbium positions in each domain.
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20.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Molchanova A. D., Boldyrev K. N., Erofeev A. S., Moshkina E. M., Bezmaternykh L. N.
Заглавие : Magnetic phase transitions and linear magnetic dichroism in manganese-doped copper metaborate (Cu,Mn)B2O4
Коллективы : International School and Conference on Optoelectronics, Photonics, Engineering and Nanostructures
Место публикации : J. of Phys.: Conf. Ser.: IOP, 2017. - Vol. 917. - Ст.072003. - DOI 10.1088/1742-6596/917/7/072003
Примечания : Cited References: 10. - This work was supported by the Russian Foundation for Basic Research (Grant No 15-02-07451a) and the President of the Russian Federation (Grant МК-3577.2017.2)
Аннотация: The work presents a study of manganese-doped copper metaborate (Cu,Mn)B2O4 using optical spectroscopy. The temperature of the antiferromagnetic phase transition TN = 19 K has been defined according to the absorption spectra. Polarization studies (Cu,Mn)B2O4 in isotropic ab-plane show the presence of linear antiferromagnetic dichroism in the magnetically ordered state previously observed in pure copper metaborate CuB2O4.This measurement allows to find the magnetic phase transition into an elliptical structure at the temperature T* = 7.0 K.
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