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Bifurcations of coupled electron-phonon modes in an antiferromagnet subjected to a magnetic field / K. N. Boldyrev [et al.] // Phys. Rev. Lett. - 2017. - Vol. 118, Is. 16. - Ст. 167203, DOI 10.1103/PhysRevLett.118.167203. - Cited References: 26. - This research was supported by the Russian Scientific Foundation under Grant No. 14-12-01033, the President of Russian Federation (MK-3577.2017.2, K. N. B.), and the U.S. Department of Energy under Grant No. DE-FG02-07ER46382 (experiments at U4-IR beam line NSLS-BNL, T. N. S. and A. A. S.). The National Synchrotron Light Source is operated as a user facility for the U.S. Department of Energy under Contract No. DE-AC02-98CH10886. Part of this work was supported by EMFL (Contract No. 26211). M. N. P. thanks B. Z. Malkin and A. V. Popov for helpful discussions. . - ISSN 0031-9007
Кл.слова (ненормированные):
Antiferromagnetic materials -- Bifurcation (mathematics) -- Electron-phonon interactions -- Electrons -- Magnetic fields -- Magnetism -- Temperature -- Antiferromagnetic crystals -- Bifurcation points -- Electron phonon couplings -- Electronic excitation -- External magnetic field -- Field independents -- Low temperatures -- Reflection spectra -- Phonons
Аннотация: We report on a new effect caused by the electron-phonon coupling in a stoichiometric rare-earth antiferromagnetic crystal subjected to an external magnetic field, namely, the appearance of a nonzero gap in the spectrum of electronic excitations in an arbitrarily small field. The effect was registered in the low-temperature far-infrared (terahertz) reflection spectra of an easy-axis antiferromagnet PrFe3(BO3)4 in magnetic fields Bext-c. Both paramagnetic and magnetically ordered phases (including a spin-flop one) were studied in magnetic fields up to 30 T, and two bifurcation points were observed. We show that the field behavior of the coupled modes can be successfully explained and modeled on the basis of the equation derived in the framework of the theory of coupled electron-phonon modes, with the same field-independent electron-phonon interaction constant |W|=14.8 cm-1. © 2017 American Physical Society.

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Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russian Federation
Department of Physics, New Jersey Institute of Technology, Newark, NJ, United States
High Field Magnet Laboratory (HFML-EMFL), Radboud University, Nijmegen, Netherlands
Kirenskiy Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Boldyrev, K. N.; Stanislavchuk, T. N.; Sirenko, A. A.; Kamenskyi, D.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Popova, M. N.
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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.] // 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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Terahertz optical activity at crystal field transitions in Tm3+ Ions in magnetoelectric alumoborates / A. M. Kuzmenko [et al.] // Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 4PO-J-33. - P. 912

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Доп.точки доступа:
Kuzmenko, A. M.; Mukhin, A. A.; Ivanov, V. Yu.; Shuvaev, A.; Dziom, V.; Pimenov, A.; Boldyrev, K. N.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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Boldyrev, K. N.
The electronic and magnetic structures of manganese doped copper metaborate Cu0.98Mn0.02B2O4 / K. N. Boldyrev, A. D. Molchanova, E. M. Moshkina // Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 4OR-O-11. - P. 752

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Доп.точки доступа:
Molchanova, A. D.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Болдырев, Кирилл Николаевич; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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High-resolution spectroscopy, crystal-field calculations, and quadrupole helix chirality of DyFe3(BO3)(4) / M. N. Popova [et al.] ; ed. E. A. Vinogradov [et al.] // XXV Congress on Spectroscopy. - 2017. - Vol. 132. - Ст. 03041. - (EPJ Web of Conferences), DOI 10.1051/epjconf/201713203041. - Cited References:2 . - ISSN 2100-014X

РУБ Spectroscopy

Аннотация: High-resolution polarized transmission spectra of DyFe3(BO3)(4) single crystals were investigated in broad spectral (10-23000 cm(-1)) and temperature (3.5-300 K) ranges. Energies of the dysprosium levels in the paramagnetic and antiferromagnetic phases were determined. On the basis of these data and preliminary calculations in the frameworks of the exchange-charge model, we determined the crystal-field and Dy-Fe exchange interaction parameters of the Dy3+ ions at sites with the point C-2 symmetry corresponding to the enantiomorphic P3(1)21 and P3(2)21 space groups. The values of electronic quadrupole moments of the Dy3+ ions were calculated, which enabled us to interpret results of the work [Usui et al., Nature Mater. 13, 611 (2014)] on the observation of domains of different quadrupole chirality in DyFe3(BO3)(4).

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Доп.точки доступа:
Popova, M. N.; Попова, Марина Николаевна; Malkin, B. Z.; Stanislavchuk, T. N.; Chukalina, E. P.; Boldyrev, K. N.; Болдырев, Кирилл Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Vinogradov, E.A. \ed.\; Naumov, A.V. \ed.\; Gladush, M.G. \ed.\; Karimullin, K.R. \ed.\; Congress on Spectroscopy(25 ; 2016 ; Oct ; 03-07 ; Troitsk)
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    Evidence for a collinear easy-plane magnetic structure of multiferroic EuFe3(BO3)4: Spectroscopic and theoretical studies / M. N. Popova [et al.] // Phys. Rev. B. - 2016. - Vol. 94, Is. 18. - Ст. 184418, DOI 10.1103/PhysRevB.94.184418. - Cited References: 49. - This work was supported by the Russian Science Foundation under Grant No. 14-12-01033. I.A.G. and V.L.T. are grateful to L. N. Bezmaternykh for useful comments concerning the crystal growth, to M. S. Molokeev for the XRD characterization of the samples, and to the Russian Foundation for Basic Research for a financial support (Grants No. 13-02-12442 and No. 14-02-00307a). . - ISSN 1098-0121
   Перевод заглавия: Фактические данные по коллинеарности легкоплоскостной магнитной структуры мультиферроика EuFe3 (BO3) 4: спектроскопические и теоретические исследования
Аннотация: We performed high-resolution polarized optical transmission spectroscopy and theoretical studies of multiferroic EuFe3(BO3)4 single crystals in the three phases: paramagnetic R32(T˃Ts=84K) and P3121(Ts˃T˃TN=34K), and antiferromagnetic (T˂TN) ones. The analysis of the spectra reveals interesting details of the magnetic structure, namely, a collinear arrangement of the iron magnetic moments along the C2 symmetry axis in the ab crystallographic plane of EuFe3(BO3)4 below TN. Spectral signatures of the phase transitions and the spin-phonon interaction are observed and discussed. Reliable crystal-field and exchange-interaction parameters are obtained and used to model the magnetic susceptibility of the compound. The results of detailed calculations of the electric polarization of EuFe3(BO3)4 in the R32 phase are presented, and mechanisms of the magnetoelectric response are discussed. We detect a strong effect of impurities (that enter the crystal from a flux in the course of the crystal growth) on the structural phase-transition temperature and demonstrate a coexistence of both R32 and P3121 phases down to the lowest temperatures in a EuFe3(BO3)4 crystal grown with the Bi2Mo3O12 based flux, due to inhomogeneous distribution of impurity Bi3+ ions. Our study can be considered as a demonstration of the abilities of optical spectroscopy in delivering new information on a magnetic compound, even in the case when other methods fail. © 2016 American Physical Society.

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Держатели документа:
Institute for Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russian Federation
Kazan Federal University, Kazan, Russian Federation
Department of Physics, New Jersey Institute of Technology, Newark, NJ, United States
Moscow Institute of Physics and Technology, State University, Dolgoprydny, Moscow region, Russian Federation
L. V. Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popova, M. N.; Malkin, B. Z.; Boldyrev, K. N.; Stanislavchuk, T. N.; Erofeev, D. A.; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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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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Bifurcations observed in the spectra of coupled electron-phonon modes in multiferroic PrFe3(BO3)4 subjected to a magnetic field / K. N. Boldyrev [et al.]. - Electronic text data // ArXiv. - 2016. - Ст. 1609.02125. - Cited References: 19. - This research was supported by the Russian Scientific Foundation under Grant No 14-12-01033, the President of Russian Federation (MK-3521-2015.2, K.N.B.), and the U.S. Department of Energy under Grant No DE-FG02-07ER46382 (experiments at U4-IR beamline NSLS-BNL, T.N.S. and A.A.S.). The National Synchrotron Light Source is operated as a User Facility for he U.S. Department of Energy under Contract No. DE-AC02-98CH10886. Part of this work was supported by EMFL (contract No. 26211). M.N.P. thanks B.Z. Malkin helpful discussions.
Аннотация: We report on bifurcations effect mediated by the electron-phonon coupling in a concentrated rare-earth-containing antiferromagnet, observed in the spectra of coupled 4f-electron-phonon modes under the influence of an external magnetic field. The effect was observed in the low-temperature far-infrared (terahertz) reflection spectra of a multiferroic easy-axis antiferromagnet PrFe3(BO3)4 in magnetic fields Bext||c. Both paramagnetic and magnetically ordered phases (including a spin-flop one) were studied in magnetic fields up to 30 T. We show that the field behavior of the coupled modes can be successfully explained and modeled on the base of the equation derived in the frame of the theory of coupled electron-phonon modes, with the same field-independent electron-phonon interaction constant |W|=14.8cm−1.

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Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, 108840 Troitsk, Moscow, Russia
Department of Physics, New Jersey Institute of Technology, 07102 Newark, New Jersey, USA
High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, Netherlands
Kirenskiy Institute of Physics, Siberian Branch of RAS, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Boldyrev, K. N.; Stanislavchuk, T. N.; Sirenko, A. A.; Kamenskyi, D.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Popova, M. N.
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Synthesis and optical properties of nickel-doped copper metaborate crystals / A. D. Molchanova, E. M. Moshkina, M. S. Molokeev [et al.] // Opt. Spectrosc. - 2022. - Vol. 130, Is. 1. - P. 105-109, DOI 10.21883/EOS.2022.01.52994.41-21. - Cited References: 18. - The study was performed with the support of Russian Science Foundation, RSF grant № 19-12-00413 . - ISSN 0030-400X. - ISSN 1562-6911
Кл.слова (ненормированные):
3d-ions -- crystal growth -- optical spectroscopy -- magnetic ordering -- cuprates
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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Публикация на русском языке Синтез и оптические свойства кристаллов метабората меди, легированного никелем [Текст] / А. Д. Молчанова, Е. М. Мошкина, М. С. Молокеев [и др.] // Оптика и спектроскопия. - 2022. - Т. 130 Вып. 1. - С. 111-115

Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Scientific and innovative management, Kemerovo State University, Kemerovo, Russia

Доп.точки доступа:
Molchanova, A. D.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Tropina, E. V.; Bovina, A. F.; Бовина, Ася Федоровна; Boldyrev, K. N.
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10.

Higt-resolution spectroscopy of Yb3+ centers in RAl3(BO3)4:Yb single crystals / K. N. Boldyrev, M. N. Popova [et al.] // Excit. St. of Trans. Elem. and Worksh. on Luminesc.: ESTE2010 : book of abstracts. - Wrocław : Wydział Chemii Uniwersytetu Wrocławskiego, 2010. - Ст. Tu-7

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Доп.точки доступа:
Boldyrev, K.N.; Popova, M. N.; Попова, Марина Николаевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bettinelli, M.; Loiseau, P.; Leonyuk, N. I.; Excited States of Transition Elements and Workshop on Luminescence(2010 ; Sept. ; 04-09 ; Wrocław & Piechowice, Poland)
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11.

Synthesis and optical properties of nickel-doped copper metaborate crystals / A. D. Molchanova, E. M. Moshkina, M. S. Molokeev [et al.] // Opt. Spectrosc. - 2023. - Vol. 131, Is. 8. - P. 717-722, DOI 10.1134/S0030400X23060127. - Cited References: 18. - The study was performed with the support of Russian Science Foundation, RSF grant no. 19-12-00413 . - ISSN 0030-400X. - ISSN 1562-6911
Кл.слова (ненормированные):
3d-ions -- crystal growth -- optical spectroscopy -- magnetic ordering -- cuprates
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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Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, 108840, Moscow, Troitsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Scientific and Innovation Department, Kemerovo State University, 650000, Kemerovo, Russia

Доп.точки доступа:
Molchanova, A. D.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Tropina, E. V.; Bovina, A. F.; Бовина, Ася Федоровна; Boldyrev, K. N.
}
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12.

Optical linear dichroism in the ab-plane of NdFe3(BO3)4 ferroborate / K. N. Boldyrev, M. Diab, I. A. Gudim, M. N. Popova // J. Exp. Theor. Phys. - 2023. - Vol. 137, Is. 4 : Special Issue dedicated to the 95th Anniversary of L. A. Prozorova. - P. 486-491, DOI 10.1134/S1063776123100011. - 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) . - ISSN 1063-7761. - ISSN 1090-6509
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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Публикация на русском языке Оптический линейный дихроизм в ab-плоскости ферробората NdFe3(BO3)4 [Текст] / К. Н. Болдырев, М. Диаб, И. А. Гудим, М. Н. Попова. - 6 с. // Журн. эксперим. и теор. физ. - 2023. - Т. 164 Вып. 4 : Специальный выпуск, посвященный 95-летию Л. А. Прозоровой. - С. 563-568

Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, 108840, Troitsk, Moscow, Russia
Moscow Institute of Physics and Technology (State University), 141700, Dolgoprudnyi, Moscow oblast, Russia
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Boldyrev, K. N.; Diab, M.; Gudim, I. A.; Гудим, Ирина Анатольевна; Popova, M. N.
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13.

Magnetic structure of ErFe3(BO3)4: Spectroscopic and thermodynamic studies / E. A. Popova, E. P. Chukalina, K. N. Boldyrev [et al.] // J. Magn. Magn. Mater. - 2020. - Vol. 500. - Ст. 166374, DOI 10.1016/j.jmmm.2019.166374. - 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» . - ISSN 0304-8853
Кл.слова (ненормированные):
Erbium iron borate -- High-resolution optical spectroscopy -- Modeling of magnetic properties
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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Держатели документа:
National Research University Higher School of Economics, Moscow, 101000, Russian Federation
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, 108840, Russian Federation
Moscow Institute of Physics and Technology (National Research University), Dolgoprudnyi, 141701, Russian Federation
Kirenskiy Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Popova, E. A.; Chukalina, E. P.; Boldyrev, K. N.; Jablunovskis, A.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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14.

    Magnetic phase transitions and linear magnetic dichroism in manganese-doped copper metaborate (Cu,Mn)B2O4 / A. D. Molchanova [et al.] // J. of Phys.: Conf. Ser. : IOP, 2017. - Vol. 917. - Ст. 072003DOI 10.1088/1742-6596/917/7/072003. - 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)
   Перевод заглавия: Магнитные фазовые переходы и линейный магнитный дихроизм в допированном марганцем метаборате меди (Cu,Mn)B2O4
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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Доп.точки доступа:
Molchanova, A. D.; Boldyrev, K. N.; Erofeev, A. S.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; International School and Conference on Optoelectronics, Photonics, Engineering and Nanostructures(4 ; 2017 ; 3-6 Apr. ; Saint Petersburg)
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15.

Regulation of the phase transition temperature and hysteresis width by changing the composition of solid solution / K. N. Boldyrev, V. M. Burlakov, I. A. Gudim [et al.] // Phys. Rev. Mater. - 2021. - Vol. 5, Is. 9. - Ст. 094414, DOI 10.1103/PhysRevMaterials.5.094414. - Cited References: 52. - This work is supported by the Russian Science Foundation under Grant No. 19-12-00413 . - ISSN 2475-9953
Кл.слова (ненормированные):
Crystal impurities -- Electronic cooling -- Hysteresis -- Hysteresis loops -- Magnetic materials -- Magnetic storage -- Optical switches -- Rare earths -- Temperature -- Virtual storage -- F-f transitions -- Frequency shift -- Hysteresis widths -- Mixed crystals -- Optical spectrum -- Phase transition temperatures -- Rectangular hysteresis loop -- Structural phase transition -- Thermal hysteresis -- Transition hysteresis -- Solid solutions
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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Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, 108840, Russian Federation
Linacre College, University of Oxford, St Cross Road, Oxford, OX1 3JA, United Kingdom
Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, 660036, Russian Federation
Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russian Federation

Доп.точки доступа:
Boldyrev, K. N.; Burlakov, V. M.; Gudim, I. A.; Гудим, Ирина Анатольевна; Gavrilkin, S. Y.; Popova, M. N.
}
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16.

Molchanova, A. D.
Spectroscopic study and analysis of d-d transitions in Ni ions in nickel orthoborate (Cu, Ni)B2O4 / A. D. Molchanova, K. N. Boldyrev, E. M. Moshkina // 4th International Baltic Conference on Magnetism (IBCM 2021) : Book of abstracts. - 2021. - P. 165. - Cited References: 7. - This work was supported by the Russian Science Foundation, grant № 19-12-00413

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

Доп.точки доступа:
Boldyrev, K. N.; Болдырев, Кирилл Николаевич; Moshkina, E. M.; Мошкина, Евгения Михайловна; International Baltic Conference on Magnetism: focus on nanobiomedicine and smart materials(4 ; 2021 ; Aug. 29-Sept. 2 ; Svetlogorsk, Russia); Балтийский федеральный университет им. И. Канта
}
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17.

Investigation of manganese-doped copper metaborate Cu1-xMnxB2O4 by linear antiferromagnetic dichroism / A. D. Molchanova [et al.] // Магнитные материалы. Новые технологии : тез. докл. VII Байкал. Междунар. конф. / Иркутский гос. ун-т. - Иркутск, 2016. - P. 166. - Библиогр.: 4 назв. - This work was supported by the Russian Foundation for Basic Research (Grant No 15-02-07451a) and the President of the Russian Federation (Grant No MK-3521-2015.2) . - ISBN 978-591-345-152-1. - ISBN 978-591-345-152-1

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Доп.точки доступа:
Исхаков, Рауф Садыкович \чл. прогр. ком.\; Iskhakov, R. S.; Аплеснин, Сергей Степанович \чл. прогр. ком.\; Aplesnin, S. S.; Овчинников, Сергей Геннадьевич \чл. прогр. ком.\; Ovchinnikov, S. G.; Molchanova, A. D.; Boldyrev, K. N.; Болдырев, Кирилл Николаевич; Moshkina, E. M.; Мошкина, Евгения Михайловна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; "Магнитные материалы. Новые технологии", Байкальская международная конференция(7 ; 2016 ; авг. ; 22-26 ; Листвянка, пос. (Иркутская обл.)); "Magnetic materials. New tecnologies", Baikal International Conference(7 ; 2016 ; Aug. ; 22-26 ; Listvyanka, Irkutsk region); Байкальская международная конференция "Магнитные материалы. Новые технологии"(7 ; 2016 ; авг. ; 22-26 ; п. Листвянка, Иркутская обл.); Иркутский государственный университет
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18.

Magnetic and magnetoelastic properties of TmAl3(BO3)4 [Текст] / A. I. Begunov [et al.] // Moscow int. Symp. on Magnet. (MISM-2014) : Book of abstracts. - 2014. - Ст. 30PO-M-18. - P. 275 . - ISBN 978-5-91978-025-0

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Доп.точки доступа:
Begunov, A. I.; Demidov, A. A.; Volkov, D. V.; Волков, Д. В.; Gudim, I. A.; Гудим, Ирина Анатольевна; Eremin, E. V.; Еремин, Евгений Владимирович; Boldyrev, K. N.; Moscow International Symposium on Magnetism(6 ; 2014 ; 29 June-3 July ; Moscow); Московский государственный университет им. М.В. Ломоносова
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19.

    Coupling between phonon and crystal-field excitations in multiferroic PrFe3(BO3)4 / K. N. Boldyrev [et al.] // Phys. Rev. B. - 2014. - Vol. 90, Is. 12. - Ст. 121101, DOI 10.1103/PhysRevB.90.121101. - Cited References: 35. - This research was supported by the Russian Scientific Foundation under Grant No. 14-12-01033, the President of Russian Federation (MK-1700.2013.2; K.N.B.), and the U.S. Department of Energy under Grant No. DE-FG02-07ER46382 (experiments at U4-IR beamline NSLS-BNL; T.N.S. and A.A.S.). 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 drawing her attention to the work [33] and for helpful discussions. . - ISSN 1098-0121. - ISSN 1550-235X
   Перевод заглавия: Взаимодействие между фононами и возбуждениями кристаллического поля в мультиферроике PrFe3(BO3)4

РУБ Physics, Condensed Matter
Рубрики:
MAGNETOELECTRIC PROPERTIES
GROUND-STATE
SM
Аннотация: Far-infrared reflection and ellipsometry measurements on multiferroic PrFe3(BO3)4 and SmFe3(BO3)4 single crystals were used to investigate the interaction between lattice phonons and electronic excitations associated with 4f crystal-field transitions. A temperature-dependent interference between two types of excitations was observed in PrFe3(BO3)4 in which the frequency of 4f crystal-field electronic excitation of Pr3+ falls into the TO-LO frequency interval of the optical phonon mode near 50 cm−1 (1.5 THz). Experimental data were explained on the basis of a theoretical model of coupled electron-phonon modes. The fitting procedure revealed the value 14.8 cm−1 for the electron-phonon coupling constant. This rather large value points to an essential role played by the electron-phonon interaction in the physics of multiferroics.

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Держатели документа:
RAS, Inst Spect, Troitsk 142190, Russia
New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Boldyrev, K. N.; Stanislavchuk, T. N.; Sirenko, A. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Popova, M. N.; Russian Scientific Foundation [14-12-01033]; President of Russian Federation [MK-1700.2013.2]; U.S. Department of Energy [DE-FG02-07ER46382, DE-AC02-98CH10886]
}
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20.

Magnetic, magnetoelastic, and spectroscopic properties of TmAl3(BO3)4 / A. A. Demidov [et al.] // J. Exp. Theor. Phys. - 2014. - Vol. 119, Is. 4. - P. 737-744, DOI 10.1134/S106377611410015X. - 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. . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
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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Публикация на русском языке Магнитные, магнитоупругие и спектроскопические свойства TmAl3(BO3)4 [Текст] / А. А. Демидов [и др.] // Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 146 Вып. 4. - С. 835-843

Держатели документа:
Bryansk State Tech Univ, Bryansk 241035, Russia
Moscow MV Lomonosov State Univ, Moscow 119992, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Spect, Moscow 142190, Russia

Доп.точки доступа:
Demidov, A. A.; Volkov, D. V.; Gudim, I. A.; Гудим, Ирина Анатольевна; Eremin, E. V.; Еремин, Евгений Владимирович; Boldyrev, K. N.; Russian Foundation for Basic Research [13-02-12442ofi_m2]; Russian Federation [MK-1700.2013.2]
}
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