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Structural and magnetic interplay in multiferroic Ho0.5Nd0.5Fe3(BO3)4 / A. Tripathy, K. Gautam, K. Dey [et al.] // Phys. Rev. B. - (ISSN). - 2023. - Vol. 107, Is. 21. - Ст. 214106, DOI 10.1103/PhysRevB.107.214106. - Cited References: 63. - A.T. and D.K.S. gratefully acknowledge financial support from the Department of Science and Technology (DST) in India for travel support through the India-DESY Collaboration for performing experiments at PETRA-III, DESY. D.K.S. acknowledges support from the DST, New Delhi, India, through Grant No. INI/RUS/RFBR/P-269 (DST-RSF project). The authors acknowledge K. Sharma for help during magnetization measurements . - ISSN 2469-9950. - ISSN 2469-9969
Аннотация: Rare-earth iron borates, RFe3(BO3)4 (R = rare earth), are of considerable interest because of their structural and magnetic complexities due to the involvement of both 3d and 4f magnetic interactions in a helical lattice. Among them Ho0.5Nd0.5Fe3(BO3)4 has attracted the most attention, as it exhibits a multiferroic property with a large, spontaneous, and magnetic-field-induced electric polarization (P) below the antiferromagnetic transition temperature (TN ~ 32 K). This compound has been reported to be noncentrosymmetric (nonpolar) down to the lowest temperature, and the origin of spontaneous electric polarization below TN is not known. By utilizing temperature-dependent synchrotron x-ray powder diffraction, we report here the observation of structural phase transition, i.e., the lowering of crystal symmetry from R32 to P3121 below TN in Ho0.5Nd0.5Fe3(BO3)4, which is further confirmed by single-crystal x-ray diffraction measurements as well as substantiated by dielectric and Raman spectroscopic results. With the help of x-ray resonant magnetic scattering, we have studied the element-specific magnetic ordering behavior, and by combining all the results, we show that the spontaneous electric polarization below the antiferromagnetic ordering transition emerges through the p-d hybridization mechanism associated with the FeO6 octahedra. The observations of subtle structural changes at low temperature and element-specific magnetic ordering behavior provide a comprehensive understanding of the multiferroicity in this family of compounds.

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Держатели документа:
UGC-DAE Consortium for Scientific Research, Indore 452001, India
Department of Physics, Aligarh Muslim University, Aligarh 202002, India
Accelerator Physics and Synchrotrons Utilization Division, Raja Ramana Centre for Advance Technology, Indore 452013, India
Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
Deutsches Elektronen-Synchrotron, Notkestrasse 85, D-22607 Hamburg, Germany
L. V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Tripathy, A.; Gautam, K.; Dey, K.; Sahu, S. R.; Ahad, A.; Upadhyay, A.; Sagdeo, A.; Francoual, S.; Bereciartua, P. J.; Gudim, I. A.; Гудим, Ирина Анатольевна; Strempfer, J.; Sathe, V. G.; Shukla, D. K.
}
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Magnetic ordering and chirality in multiferroic Dy1-xHoxMnO3 (x = 0.2) / A. N. Matveeva, I. A. Zobkalo, A. Sazonov [и др.] // Phys. B: Condens. Matter. - 2023. - Vol. 658. - Ст. 414821, DOI 10.1016/j.physb.2023.414821. - Cited References: 41. - The authors are grateful to D.A. Balaev for fruitful discussions and crystal growth management. This work was supported by the Russian Foundation for Basic Research grant # 19-52-12047, and DFG grant # SA3688/1-1, also by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects number 18-42-243024 and 20-42-243008. The neutron data were obtained at the instrument POLI operated jointly by RWTH Aachen University and Jülich Centre for Neutron Science within JARA cooperation . - ISSN 0921-4526. - ISSN 1873-2135
Кл.слова (ненормированные):
Neutron diffraction -- Crystal structure -- Multiferroics -- Magnetic structure -- Manganites
Аннотация: Effect of substitution Dy by Ho on the magneto-electric behavior of the compound Dy0.8Ho0.2MnO3 was investigated by the different methods of polarized and classical neutron diffraction and macroscopic methods. It is shown that substitution by Ho of 20% on the position of Dy do not change overall crystal symmetry of compound. It remains of Pbnm type down to the very low temperatures. Magnetic ordering, its temperature and field evolution was determined by the use of single crystal neutron diffraction and magnetization measurements. Chiral type of magnetic structure on Mn subsystem is confirmed below Tc ≈ 16 K. Using polarized neutron diffraction the 3-component character of rare earth magnetic ordering in Dy0.8Ho0.2MnO3 in contrast to DyMnO3 could be revealed. It was shown that doping by 20% Ho suppresses the spontaneous rare-earth ordering with its own propagation vector and provides the situation when two magnetic subsystems, manganese and rare earth ones have a coherent incommensurate spatial propagation. The influence of the external electric field on the magnetic chirality could be directly evidenced, proving strong magneto-electric coupling in multiferroic phase. The study of the electric polarization under similar temperatures and fields on the same samples provides the direct correlation between the results of the microscopic and macroscopic investigations.

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Держатели документа:
Petersburg Nuclear Physics Institute by B.P. Konstantinov of NRC «Kurchatov Institute», 188300, Gatchina, Russia
Institute of Crystallography, RWTH Aachen University and Jülich Centre for Neutron Science at Heinz Maier- Leibnitz Zentrum, Garching, Germany
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia

Доп.точки доступа:
Matveeva, A. N.; Zobkalo, I. A.; Sazonov, A.; Freidman, A. L.; Фрейдман, Александр Леонидович; Semenov, S. V.; Семёнов, Сергей Васильевич; Kolkov, M. I.; Колков, Максим Игоревич; Terentjev, K. Yu.; Терентьев, Константин Юрьевич; Pavlovskiy, N. S.; Павловский, Николай Сергеевич; Shaykhutdinov, K. A.; Hutanu, V.
}
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Complex interplay between 3d and 4f magnetic systems in multiferroic DyMnO3 / A. N. Matveeva, I. A. Zobkalo, M. Meven [et al.] // J. Magn. Magn. Mater. - 2023. - Vol. 569. - Ст. 170415, DOI 10.1016/j.jmmm.2023.170415. - Cited References: 28. - The authors are grateful to S.V. Gavrilov for the technical assistance. This work was supported by the Russian Foundation for Basic Research grant # 19-52-12047, and DFG grant # SA 3688/1-1, also by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects number 18-42-243024 and 20-42-243008. The neutron data were obtained at the instrument HEiDi operated jointly by RWTH Aachen University and Jülich Centre for Neutron Science within JARA cooperation . - ISSN 0304-8853
Кл.слова (ненормированные):
Neutron diffraction -- Crystal structure -- Multiferroics -- Magnetic structure -- Manganites
Аннотация: Structural and magnetic properties of single crystals of DyMnO3 were investigated by neutron diffraction in order to study the peculiarities of 3d-4f interactions in this compound. Precise magnetic order and its detailed temperature evolution were determined using single crystal neutron diffraction. Elliptical cycloid on manganese subsystem below TCh = 19 K was confirmed, with temperature decrease the elipticity of the Mn magnetic structure reduces significantly, creating almost circular cycloid. Temperature evolution of the magnetic structure demonstrate specific hysteretic behavior. The results show a complex interplay between transition metal and rare earth magnetic sublattices leading to so-called “Mn- controlled” and “Dy- controlled” magnetic states. The strong and complicate 3d-4f interaction leads to the unusual very slow magnetic structure relaxation.

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Держатели документа:
Petersburg Nuclear Physics Institute by B.P. Konstantinov of NRC «Kurchatov Institute», Gatchina, 188300, Russian Federation
Institute of Crystallography, RWTH Aachen University and Julich Centre for Neutron Science at Heinz Maier- Leibnitz Zentrum, Garching, Germany
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Matveeva, A. N.; Zobkalo, I. A.; Meven, M.; Freidman, A. L.; Фрейдман, Александр Леонидович; Semenov, S. V.; Семёнов, Сергей Васильевич; Terentjev, K. Yu.; Терентьев, Константин Юрьевич; Pavlovskiy, N. S.; Павловский, Николай Сергеевич; Kolkov, M. I.; Колков, Максим Игоревич; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Hutanu, V.
}
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Effect of uncontrolled impurities on magnetic and structural transitions of the GdFe3(BO3)4 multiferroic / I. A. Gudim, E. V. Eremin, A. S. Krylov, V. R. Titova // V International Baltic Conference on Magnetism. IBCM : Book of abstracts. - 2023. - P. 128. - Cited References: 3. - Support by RSF and KRFS № 22-12-20019 are acknowledged

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

Доп.точки доступа:
Gudim, I. A.; Гудим, Ирина Анатольевна; Eremin, E. V.; Еремин, Евгений Владимирович; Krylov, A. S.; Крылов, Александр Сергеевич; Titova, V. R.; International Baltic Conference on Magnetism(5 ; 2023 ; Aug. 20-24 ; Svetlogorsk, Russia); Балтийский федеральный университет им. И. Канта
}
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Structure and properties of multiferroic ferroborates of mixed composition SmFe3-xAlx(BO3)4 and Eu1-yLayFe3(BO3)4 / K. V. Frolov, E. S. Smirnova, E. V. Sidorova [et al.] // 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. - Cited References: 6. - РНФ 23-22-00286 . - ISBN 978-5-00202-320-2

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Держатели документа:
Kirensky Institute of Physics SB RAS

Доп.точки доступа:
Ovchinnikov, S. G. \int. adv. com.\; Овчинников, Сергей Геннадьевич; Frolov, K. V.; Smirnova, E. S.; Sidorova, E. V.; Alekseeva, O. A.; Sorokin, T. A.; Artemov, V. V.; Chmelenin, D. N.; Gudim, I. A.; Гудим, Ирина Анатольевна; Samarkand International Symposium on Magnetism(2023 ; July 2-6 ; Samarkand); Samarkand State University
}
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Magnetic circular dichroism of f-f transitions in multiferroic antiferromagnet Ho0.75Nd0.25Fe3(BO3)4 / A. V. Malakhovskii, V. V. Sokolov, A. L. Sukhachev, I. A. Gudim // International conference "Functional materials" : book of abstracts / ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2023. - P. 100-101. - Cited References: 2

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Держатели документа:
Kirensky Institute of Physics, FRC KSC SB RAS,

Доп.точки доступа:
Berzhansky, V. N. \ed.\; Бержанский, Владимир Наумович; Ovchinnikov, S. G. \org. com.\; Овчинников, Сергей Геннадьевич; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sokolov, V. V.; Соколов, Валерий Владимирович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; "Functional materials", International conference(2023 ; Oct. 2-6 ; Crimea, Foros); Крымский федеральный университет имени В.И. Вернадского
}
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Eremin, E. V.
Magnetic properties of GdFe3(BO3)4 multiferroic grown from various melt solutions / E. V. Eremin, I. A. Gudim, V. R. Titova // V International Baltic Conference on Magnetism. IBCM : Book of abstracts. - 2023. - P. 76. - Cited References: 1. - РНФ № 22-12-20019 ; Красноярский регион. фонд науки

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

Доп.точки доступа:
Gudim, I. A.; Гудим, Ирина Анатольевна; Titova, V. R.; Титова, Вероника Романовна; Еремин, Евгений Владимирович; International Baltic Conference on Magnetism(5 ; 2023 ; Aug. 20-24 ; Svetlogorsk, Russia); Балтийский федеральный университет им. И. Канта
}
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Phase transitions and p–T phase diagram of the multiferroic TbFe3(BO3)4 crystal / A. Krylov, M. Pavlovskiy, Y. Kitaev [et al.] // J. Raman Spectrosc. - 2022. - Vol. 53, Is. 6. - P. 1179-1187, DOI 10.1002/jrs.6341. - Cited References: 48. - Russian Foundation for Basic Research; RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, Grant/Award Number: 20-42-240009; Russian Foundation for Basic Research and DFG (Deutsche Forschungsgemeinschaft), Grant/Award Numbers: 448809307, 21-52-12018 . - ISSN 0377-0486. - ISSN 1097-4555

РУБ Spectroscopy
Рубрики:
BILBAO CRYSTALLOGRAPHIC SERVER
RAMAN-SPECTRA
HIGH-TEMPERATURE
Кл.слова (ненормированные):
ab initio calculation -- ferroborate -- multiferroic -- phase transitions -- p-T phase diagram
Аннотация: The structural phase transitions in multiferroic TbFe3(BO3)4 with change hydrostatic pressures and temperatures have been studied by Raman spectroscopy and calculation within density functional theory. Lattice dynamics calculations in the TbFe3(BO3)4 crystal in the ��32 phase under various values of applied hydrostatic pressure (from 0 up to 5 GPa with 1 GPa step) were performed. The calculation performed in this work in a TbFe3(BO3)4 crystal showed that the applied pressure can increase the phase transition temperature. Raman spectra of the TbFe3(BO3)4 crystal have been investigated at simultaneously high temperature and high pressure (up to 5.14 GPa and 465 K). The appearance of a soft mode was observed with decreasing temperature at normal pressure. The manifestations of the interaction of the structural and magnetic order parameters in the range from 13 to 50 K were observed at normal pressure. With increasing pressure and a fixed temperature, recovery of the soft modes is also observed. The experimental p–T phase diagram of TbFe3(BO3)4 was established. An increase in pressure leads to an increase in the temperature of transition.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia.
Siberian Fed Univ, Photon & Laser Technol, Krasnoyarsk, Russia.
Ioffe Inst, Politekhnicheskaya 26, St Petersburg, Russia.
Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan, Peoples R China.
Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan, Peoples R China.

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Pavlovskiy, M. S.; Павловский, Максим Сергеевич; Kitaev, Y.; Gudim, I. A.; Гудим, Ирина Анатольевна; Andryshin, N. D.; Андрюшин, Никита Дмитриевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Jiang, Qinghui; Krylova, S. N.; Крылова, Светлана Николаевна; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science [20-42-240009]; Russian Foundation for Basic Research and DFG (Deutsche Forschungsgemeinschaft)German Research Foundation (DFG) [448809307, 21-52-12018]
}
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Crystal structure of bismuth-containing NdFe3(BO3)4 in the temperature range 20–500 K / E. S. Smirnova, O. A. Alekseeva, A. P. Dudka [et al.] // Acta Crystallogr. B. - 2022. - Vol. 78, Pt. 1. - P. 1-13, DOI 10.1107/S205252062101180X. - Cited References: 44. - This work was performed using the equipment of the Shared Research Center FSRC `Crystallography and Photonics' RAS supported by the Russian Ministry of Science and Higher Education. This work was supported by the Ministry of Science and Higher Education within the State assignment FSRC `Crystallography and Photonics' RAS . - ISSN 2052-5206

РУБ Chemistry, Multidisciplinary + Crystallography
Рубрики:
MAGNETIC PHASE-TRANSITIONS
UNIT-CELL PARAMETERS
DIFFRACTION
Кл.слова (ненормированные):
neodymium iron borate -- multiferroic -- crystal structure -- multi-temperature -- single-crystal X-ray diffraction -- Mossbauer spectroscopy -- characteristic temperature
Аннотация: Neodymium iron borate NdFe3(BO3)4 is an intensively studied multiferroic with high electric polarization values controlled by a magnetic field. It is characterized by a large quadratic magnetoelectric effect, rigidity in the base plane and a rather strong piezoelectric effect. In this work, the atomic structure of (Nd0.91Bi0.09)Fe3(BO3)4 was studied by single-crystal X-ray diffraction in the temperature range 20–500 K (space group R32, Z = 3). The Bi atoms found in the composition partially substitute the Nd atoms in the 3a position; they entered the structure due to the growth conditions in the presence of Bi2Mo3O12. It was shown that in the temperature range 20–500 K there is no structural phase transition R32→P3121, which occurs in rare-earth iron borates (RE = Eu–Er, Y) with an effective rare-earth cation radius smaller than that of Nd. The temperature dependence of the unit-cell c parameter reveals a slight increase on cooling below 90 K, which is similar to the results obtained previously for iron borates of Gd, Y and Ho. The atomic distances (Nd,Bi)—O, (Nd,Bi)—B, (Nd,Bi)—Fe, Fe—O, Fe—B and Fe—Fe in the iron chains and between chains decrease steadily with decreasing temperature from 500 to 90 K, whereas the B1(3b)—O distance does not change and the average B2(9e)—O distance increases slightly. There is a uniform decrease in the atomic displacement parameters with decreasing temperature, with a more pronounced decrease for the Nd(3a) and O2(9e) atoms. The O2(9e) atoms are characterized by the maximum atomic displacement parameters and the most elongated atomic displacement ellipsoids. The characteristic Debye and Einstein temperatures, and the static component in the atomic displacements were determined for cations using multi-temperature diffraction data. It was shown that the Nd cations have the weakest bonds with the surrounding atoms and the B cations have the strongest.

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Держатели документа:
Russian Acad Sci, Fed Sci Res Ctr Crystallog & Photon, Shubnikov Inst Crystallog, Moscow 119333, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Smirnova, E. S.; Alekseeva, O. A.; Dudka, A. P.; Verin, I. A.; Artemov, V. V.; Lyubutina, M. V.; Gudim, I. A.; Гудим, Ирина Анатольевна; Frolov, K. V.; Lyubutin, I. S.; Russian Ministry of Science and Higher Education; Ministry of Science and Higher Education within the State assignment FSRC 'Crystallography and Photonics' RAS
}
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10.

    Pressure–temperature phase diagram of multiferroic TbFe2.46Ga0.54(BO3)4 / A. Krylov, S. Krylova, I. Gudim [et al.] // Magnetochemistry. - 2022. - Vol. 8, Is. 6. - Ст. 59, DOI 10.3390/magnetochemistry8060059. - Cited References: 48. - The research of Krylov A. and Gudim I. was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project number 20-42-240009. This work of Vtyurin A., Krylova S. was financially supported by the Russian Foundation for Basic Research and DFG (Deutsche Forschungsgemeinschaft) project number No 21-52-12018. The experiments were performed in the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 2312-7481
   Перевод заглавия: Фазовая диаграмма температура-давление мультиферроика TbFe2.46Ga0.54(BO3)4
Кл.слова (ненормированные):
ferroborate -- phase transitions -- multiferroics -- p–T phase diagram
Аннотация: The pressure–temperature phase diagram of the multiferroic TbFe2.46Ga0.54(BO3)4 was studied for hydrostatic pressures up to 7 GPa and simultaneously with temperatures up to 400 K by the Raman spectroscopy technique. The structural phase transition from the R32 phase to the P3121 phase was determined by observing the condensation of soft modes and the appearance of new lines. An increase in pressure leads to an increase in the temperature of the structural phase transition. These phases are stable over the entire investigated temperature and pressure range. No other phases have been found.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Ioffe Institute, Politekhnicheskaya 26, St. Petersburg, 194021, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Gudim, I. A.; Гудим, Ирина Анатольевна; Kitaev, Y.; Golovkina, E.; Zhang, H.; Vtyurin, A. N.; Втюрин, Александр Николаевич
}
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11.

Magnetic properties and structural anomalies observed in multiferroic NdFe3(BO3)4 by 57Fe Mossbauer spectroscopy / K. V. Frolov, I. S. Lyubutin, O. A. Alekseeva [et al.] // J. Alloys Compd. - 2022. - Vol. 909. - Ст. 164747, DOI 10.1016/j.jallcom.2022.164747. - Cited References: 61. - This work was supported by the Russian Ministry of Science and Higher Education within the State assignment FSRC "Crystallography and Photonics" RAS and performed using the equipment of the Shared Research Center "Structural diagnostics of materials" of FSRC "Crystallography and Photonics" RAS . - ISSN 0925-8388
Кл.слова (ненормированные):
Multiferroics -- Rare earth - iron compounds -- X-ray diffraction -- Mossbauer spectroscopy -- Commensurate and incommensurate magnetic structures
Аннотация: The results of studies of the NdFe3(BO3)4 by 57Fe Mossbauer spectroscopy in comparison with the data of single crystal X-ray diffraction measurements are presented. Scanning of the crystal cell parameters in a wide temperature range T = 15–500 K revealed a negative thermal expansion along the c axis and structural anomalies. The temperature dependences of the Mössbauer parameters of hyperfine interaction in the paramagnetic state of NdFe3(BO3)4 correlate well with the behavior of crystal cell parameters obtained by X-ray diffraction data. The temperature of the magnetic phase transition TN = 32.54(4) K is established, below which the iron ions form a 3D magnetic order of the Izing type. The magnetic transition of the iron subsystem from a commensurate to an incommensurate structure at a temperature of about T ≈ 15 K is discussed. The "Mössbauer" Debye temperature ΘM was estimated to be 485(2) K.

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Держатели документа:
Shubnikov Institute of Crystallography of FSRC “Crystallography and Photonics” RAS, Moscow, 119333, Russian Federation
Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Frolov, K. V.; Lyubutin, I. S.; Alekseeva, O. A.; Smirnova, E. S.; Dudka, A. P.; Verin, I. A.; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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12.

X-ray Natural Circular Dichroism imaging of multiferroic crystals / M. S. Platunov, I. A. Gudim, E. N. Ovchinnikova [et al.] // Crystals. - 2021. - Vol. 11, Is. 5. - Ст. 531, DOI 10.3390/cryst11050531. - Cited References: 70. - This research was funded by the Russian Science Foundation (grant 19-72-00002). K.A.K. acknowledges support from the Russian Foundation for Basic Research (project no. 19-52-12029 and project no. 19-02-00483). V.E.D. was partly supported by the Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC "Crystallography and Photonics" RAS. V.Y.I. and A.A.M. were supported by the Russian Science Foundation [grant 16-12-10531] . - ISSN 2073-4352

РУБ Crystallography + Materials Science, Multidisciplinary
Рубрики:
OPTICAL-ACTIVITY
MAGNETOELASTIC PROPERTIES
SINGLE-CRYSTAL
Кл.слова (ненормированные):
multiferroics -- X-ray optical activity -- twinning -- mapping -- X-ray Natural Circular Dichroism
Аннотация: The polarizing spectroscopy techniques in visible range optics have been used since the beginning of the 20th century to study the anisotropy of crystals based on birefringence and optical activity phenomena. On the other hand, the phenomenon of X-ray optical activity has been demonstrated only relatively recently. It is a selective probe for the element-specific properties of individual atoms in non-centrosymmetric materials. We report the X-ray Natural Circular Dichroism (XNCD) imaging technique which enables spatially resolved mapping of X-ray optical activity in non-centrosymmetric materials. As an example, we present the results of combining micro-focusing X-ray optics with circularly polarized hard X-rays to make a map of enantiomorphous twinning in a multiferroic SmFe3(BO3)4 crystal. Our results demonstrate the utility and potential of polarization-contrast imaging with XNCD as a sensitive technique for multiferroic crystals where the local enantiomorphous properties are especially important. In perspective, this brings a novel high-performance method for the characterization of structural changes associated with phase transitions and identification of the size and spatial distribution of twin domains.

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia.
ESRF European Synchrotron, CS 40220, F-38043 Grenoble 9, France.
Hebrew Univ Jerusalem, Rachel & Selim Sch Engn, Dept Appl Phys, IL-9190401 Jerusalem, Israel.
Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow 119991, Russia.
RAS, FSRC Crystallog & Photon, AV Shubnikov Inst Crystallog, Moscow 119333, Russia.

Доп.точки доступа:
Platunov, M. S.; Платунов, Михаил Сергеевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Ovchinnikova, Elena N.; Kozlovskaya, Ksenia A.; Wilhelm, Fabrice; Rogalev, Andrei; Hen, Amir; Ivanov, Vsevolod Y.; Mukhin, Alexander A.; Dmitrienko, Vladimir E.; Russian Science FoundationRussian Science Foundation (RSF) [19-72-00002, 16-12-10531]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-12029, 19-02-00483]; Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC "Crystallography and Photonics" RAS
}
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13.

High-resolution optical spectroscopy, magnetic properties, and single-crystal neutron diffraction of multiferroic HoFe3(BO3)4: Magnetic structure / M. N. Popova, E. P. Chukalina, D. A. Erofeev [et al.] // Phys. Rev. B. - 2021. - Vol. 103, Is. 9. - Ст. 094411, DOI 10.1103/PhysRevB.103.094411. - Cited References: 65. - Financial support of the Russian Science Foundation under Grant No. 19-12-00413 is acknowledged. I.V.G. acknowledges financial support of the neutron scattering studies from the Russian Foundation for Basic Research under Grant No. 20-02-00109. The analysis of the measured neutron diffraction data was performed by A.A.M. with support of the Russian Science Foundation under Grant No. 16-12-10531 . - ISSN 2469-9950
Кл.слова (ненормированные):
Antiferromagnetic structures -- Elastic neutron scattering -- High-resolution spectroscopy -- Magnetic susceptibility tensors -- Magnetoelectric properties -- Neutron diffraction measurements -- Single-crystal neutron diffraction -- Temperature dependencies
Аннотация: The magnetic structure is usually determined by the neutron diffraction measurements. However, in the case of complex multisublattice magnetics, this method fails to give an unambiguous result. Here, on the example of multiferroic HoFe3(BO3)4, we show that in the case of rare-earth (RE) compounds the right magnetic structure can be determined by additionally using optical spectroscopy and a theoretical analysis based on spectroscopic data. HoFe3(BO3)4 demonstrates a series of phase transitions and interesting magnetic and magnetoelectric properties. The available information on the magnetic structure of the compound, necessary for understanding and utilizing these properties, is contradictory. To resolve the existing ambiguities, we apply a combined approach. The high-resolution spectroscopy data deliver a set of the Ho3+ crystal-field (CF) levels in the paramagnetic and both easy-plane and easy-axis magnetic phases. These data are used to determine CF and Ho3+-Fe3+ exchange parameters and, then, to calculate the temperature dependencies of the magnetic susceptibility tensor of HoFe3(BO3)4. Based on these calculations, we suggest an easy-plane antiferromagnetic structure with a collinear arrangement of the Fe spins along the a axis and induced noncolinear moments of magnetically nonequivalent Ho ions. The suggested structure is further confirmed by single-crystal elastic neutron scattering experiments. We argue that specific features of the magnetic properties of RE iron borates isostructural to HoFe3(BO3)4 are governed by the energy patterns and the symmetry properties of the wave functions of the lower CF levels of the RE ground multiplet in the crystal field of the C2 symmetry.

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Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, Moscow, Troitsk, 108840, Russian Federation
L. V. Kirensky Institute of Physics, Siberian Branch of Ras, Krasnoyarsk, 660036, Russian Federation
National Research Center "kurchatov Institute", B.P. Konstantinov Petersburg Nuclear Physics Institute, Gatchina, 188300, Russian Federation
Laboratoire Leon Brillouin, CEA-CNRS, CE-Saclay, Gif-sur-Yvette, 91191, France
Prokhorov General Physics Institute, Ras, Moscow, 119991, Russian Federation
Kazan Federal University, Kazan, 420008, Russian Federation

Доп.точки доступа:
Popova, M. N.; Chukalina, E. P.; Erofeev, D. A.; Gudim, I. A.; Гудим, Ирина Анатольевна; Golosovsky, I. V.; Gukasov, A.; Mukhin, A. A.; Malkin, B. Z.
}
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14.

Gavrichkov, V. A.
Nd-Fe exchange interaction in Nd ferroborate with multiferroic properties under optical pumping / V. A. Gavrichkov, A. V. Malakhovskii // International conference "Functional materials" : book of abstracts / ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P. 253-254. - Библиогр.: 1 назв. - The reported study was supported by the grant RFFI 19-02-00034 and the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science according to the research project ”Studies of superexchange and ICFM’2021 254 electron-phonon interactions in correlated systems as a basis for searching for promising functional materials No. 20-42-240016

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Доп.точки доступа:
Berzhansky, V. N. \ed.\; Бержанский, Владимир Наумович; Ovchinnikov, S. G. \org. com.\; Овчинников, Сергей Геннадьевич; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Ovchinnikov, S. G.; Гавричков, Владимир Александрович; "Functional materials", International conference(2021 ; Oct. 4-8 ; Alushta, Russia); Крымский федеральный университет имени В.И. Вернадского
}
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15.

Gavrichkov, V. A.
Effect of optical f - f excitations on the Nd-Fe exchange interaction in Nd ferroborate with multiferroic properties / V. A. Gavrichkov, A. V. Malakhovskii, S. G. Ovchinnikov // Phys. Rev. B. - 2021. - Vol. 104, Is. 6. - Ст. 064445, DOI 10.1103/PhysRevB.104.064445. - Cited References: 28. - The reported study was supported by the RFBR Grant 19-02-00034. V.A.G. is also grateful to the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science according to the research project "Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials" No. 20-42-240016 . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
LOCAL MAGNETIC-PROPERTIES
SINGLE-CRYSTAL
EXCITED-STATES
Аннотация: We considered the effect of optical pumping at the f−f transitions frequency on d−f superexchange in the rare-earth antiferromagnetic ferroborate Nd0.5Gd0.5Fe3(BO3)4 between Nd3+ ions in the excited states of the 4G5/2, 2G7/2, and Fe3+ in the ground state 6A1. In the ferroborate, d−f superexchange is directly related to the strong magnetoelectric coupling observed in the ground state of the material. We show that under optical pumping at the frequency of f−f transitions 4I9/2↔(4G5/2+2G7/2) in the Nd3+ ion, the nature of the d−f interaction changes to FM. The phenomena can be explained by the occupation of the excited Nd3+ “spin pure” states with spin 1/2, or their mixing to the optically excited states with spin 3/2 due to the spin-orbit interaction. Near optically excited ions Nd3+, magnetic frustrations change from FM ordering under the d−f AFM interaction to AFM ordering under the FM interaction in the basal hexagonal plane.

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Держатели документа:
Kirensky Inst Phys, Akademgorodok 50,Bld 38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович; RFBRRussian Foundation for Basic Research (RFBR) [19-02-00034]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Krasnoyarsk Regional Fund of Science [20-42-240016]; Government of Krasnoyarsk Territory
}
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16.

    Synthesis of NdSc3(BO3)4 single crystals and study of its structure properties / E. V. Eremin, M. S. Pavlovskiy, I. A. Gudim [et al.] // J. Alloys Compd. - 2020. - Vol. 828. - Ст. 154355, DOI 10.1016/j.jallcom.2020.154355. - Cited References: 35. - This study was supported by the Russian Foundation for Basic Research and Government of Krasnoyarsk Territory , Krasnoyarsk Region Science and Technology Support Fund by project № 18-42-240011 р_а . - ISSN 0925-8388
   Перевод заглавия: Синтез монокристаллов NdSc3(BO3) 4 и изучение его структурных свойств
Кл.слова (ненормированные):
Phase transition -- Crystal growth -- Lattice dynamics -- Multiferroic
Аннотация: Using the group method, single crystals of NdSc3(BO3)4 are grown from a melt solution and X-ray structural studies are performed. It is shown that at room temperature the NdSc3(BO3)4 crystal has a huntite-type structure with space group P3121. The temperature dependence of the heat capacity shows anomalous behaviour at Т = 504 ± 1 K. This anomaly corresponds to a structural phase transition from R32 to P3121. It is known that a similar transition occurs in RFe3(BO3)4 crystals; an anomaly in the specific heat is also observed. Theoretical calculations are carried out from the first principles of the lattice dynamics of the crystal under study in a high-symmetry phase with the R32 space group. An unstable (soft) mode in the boundary point of Brillouin zone was found. It was determined that this structural instability is responsible for the structural displacement-type phase transition R32 → P3121.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660037, Russian Federation
Institute of Engineering Systems and Energetics, Krasnoyarsk State Agrarian University, Krasnoyarsk, 660049, Russian Federation

Доп.точки доступа:
Eremin, E. V.; Еремин, Евгений Владимирович; Pavlovskiy, M. S.; Павловский, Максим Сергеевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Temerov, V. L.; Темеров, Владислав Леонидович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Andryushin, N. D.; Андрюшин, Никита Дмитриевич; Bogdanov, E. V.; Богданов, Евгений Витальевич
}
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17.

High-resolution optical spectroscopy and modeling of spectral and magnetic properties of multiferroic ErFe3(BO3)4 / M. N. Popova, E. P. Chukalina, D. S. Erofeev [et al.] // Phys. Rev. B. - 2020. - Vol. 101, Is. 20. - Ст. 205108, DOI 10.1103/PhysRevB.101.205108. - Cited References: 38. - Financial support of the Russian Science Foundation under Grant No. 19-12-00413 is acknowledged. . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
F-F TRANSITIONS
   ENERGY-LEVELS
   ER3+ IONS
   GROWTH
Аннотация: We carried out the high-resolution broadband temperature-dependent polarized optical spectroscopy and theoretical studies of ErFe3(BO3)4 single crystals in the paramagnetic and antiferromagnetic (T˂TN=39K) phases. On the basis of the experimentally determined 45 crystal-field (CF) levels of Er3+ ions at sites with the C2 point symmetry, CF calculations were performed, a set of physically grounded CF parameters was obtained and used to model the temperature dependences of the Er magnetic moments measured in neutron-scattering experiments, as well as the magnetic susceptibility and magnetization of the compound; the contributions of the quasi-one-dimensional iron magnetic subsystem were calculated in the frame of the previously developed self-consistent four-particle cluster model. The modeling strongly supports an easy-plane collinear structure of iron magnetic moments and excludes earlier proposed additional magnetic phase.

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Держатели документа:
Russian Acad Sci, Inst Spect, Moscow 108840, Russia.
Natl Res Univ, Moscow Inst Phys & Technol, Dolgoprudnyi 141701, Moscow Region, Russia.
LV Kirenskii Inst Phys, Siberian Branch RAS, Krasnoyarsk 660036, Russia.
Kazan Fed Univ, Kazan 420008, Russia.

Доп.точки доступа:
Popova, M. N.; Chukalina, E. P.; Erofeev, D. S.; Jablunovskis, A.; Gudim, I. A.; Гудим, Ирина Анатольевна; Malkin, B. Z.; Russian Science FoundationRussian Science Foundation (RSF) [19-12-00413]
}
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18.

Mapping the twinning in multiferroic single crystals / Gudim, E. Ovchinnikova, K. Kozlovskaya, F. Wilhelm, V. Ivanov, A. Mukhin, V. Dmitrienko, A. Rogalev, and M. Platunov // 3-я Всероссийская научная конференция «Методы исследования состава и структуры функциональных материалов» (МИССФМ-2020) : 1-4 сент. 2020, Новосибирск : сб. тез. докл. - Новосибирск, 2020. - Ст. УД-I-3. - P. 354-355. - Библиогр.: 3 . - ISBN 978-5-906376-29-9

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Доп.точки доступа:
Gudim, I. A.; Гудим, Ирина Анатольевна; Ovchinnikova, E.; Kozlovskaya, K.; Wilhelm, Fabrice; Ivanov, V.A.; Mukhin, A. A.; Dmitrienko, V.; Rogalev, Andrei; Platunov, M. S.; Платунов, Михаил Сергеевич; Российская академия наук; Сибирское отделение РАН; Институт катализа им. Г.К. Борескова Сибирского отделения РАН; Новосибирский государственный университет; Институт ядерной физики им. Г.И. Будкера Сибирского отделения РАН; Новосибирский институт органической химии им. Н. Н. Ворожцова СО РАН; Институт неорганической химии им. А.В. Николаева Сибирского отделения РАН; "Методы исследования состава и структуры функциональных материалов", Всероссийская научная конференция(3 ; 2020 ; сент. ; Новосибирск)
}
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19.

Structural features associated with multiferroic behavior in the RX3(BO3)4 system / H. Zhang [et al.] // J. Phys. Condens. Matter. - 2019. - Vol. 31, Is. 50. - Ст. 505704, DOI 10.1088/1361-648X/ab415f. - Cited References: 38 . - ISSN 0953-8984
Кл.слова (ненормированные):
multiferroic -- magnetoelectric -- crystal structure -- ferroelectric -- spin-lattice coupling
Аннотация: The magnetoelectric effect in the RX3(BO3)4 system (R = Ho, Eu, Sm, Nd, Gd; X = Fe, Al) varies significantly with the cation R despite very similar structural arrangements. Our structural studies reveal a symmetry reducing tilting of the BO3 planes and of the FeO6 polyhedra in the systems exhibiting low magnetic field induced electric polarization. Neutron scattering measurements reveal a lack of magnetic ordering indicating the primary importance of the atomic structure in the multiferroic behavior of this system.

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Держатели документа:
Department of Physics, New Jersey Institute of Technology, Newark, NJ 071022, United States
National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973, United States
L.V. Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
Center for Advanced Radiation Sources, University of Chicago, Argonne, Chicago, IL 60439, United States
Laboratoire de Physique et d'Etude des Materiaux (LPEM), ESPCI Paris, PSL University, CNRS, Paris, 75005, France
Sorbonne Universite, CNRS, LPEM, Paris, 75005, France
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States

Доп.точки доступа:
Zhang, H.; Liu, S.; Nelson, C. S.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Chen, Y. -S.; Wang, S. G.; Lobo, R. P.S.M.; Page, K.; Matsuda, M.; Pajerowski, D. M.; Williams, T. J.; Tyson, T. A.
}
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20.

IR-range photoinduced diode effect in the manganese-substituted bismuth ferrite films / S. S. Aplesnin [et al.] // Semicond. Sci. Technol. - 2019. - Vol. 34, Is. 9. - Ст. 095007, DOI 10.1088/1361-6641/ab3160. - Cited References: 45. - The reported study was funded by RFBR according to the research project No 18-52-00009 Bel_ a; No 18-32-00079 mol_ a and Belarusian Foundation project No F18R-084. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science No 18-42-240001 r_ a, to the research project: "Inversion of the sign of the components of the magnetoelectric tensor on the temperature in films of bismuth garnet ferrite replaced by neodymium". This work is part of the research program the state order No 3.5743.2017/6.7. . - ISSN 0268-1242. - ISSN 1361-6641

РУБ Engineering, Electrical & Electronic + Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
POOLE-FRENKEL CONDUCTION
BIFEO3 FILMS
LIGHT
Кл.слова (ненормированные):
multiferroic -- films -- diode effect -- polarization -- I-V characteristics -- optical absorption
Аннотация: The photoinduced diode effect has been found in BiMnxFe1-xO3 (0 < X < 0.15) films in the near-infrared and violet spectral ranges in a wide temperature interval. The dependences of the diode effect on temperature, wavelength, and illumination power have been established. The mechanism of the ferroelectric diode has been determined using its I-V characteristics at different illumination powers, optical spectra, far-infrared absorption spectra, and electric polarization hysteresis. The interplay between the photodiode effect and conductivity mechanism has been elucidated. The model of strong Coulomb potential fluctuations and quantum well asymmetry caused by the electric polarization in the film and difference between the times of carrier thermalization and recombination of electrons and holes is proposed.
В пленках феррита висмута BiMnxFe1-xO3 (0< x < 0.15) обнаружен фотоиндуцированный диодный эффект в ближней инфракрасной и фиолетовой областях спектра в широкой области температур. Определена зависимость диодного эффекта от температуры, длины волны, мощности освещения. Механизм ферроэлектрического диода определяется из вольт-амперных характеристик при разных интенсивностях освещения, оптических спектров и спектров поглощения в дальней ИК области, гистерезиса электрической поляризации. Устанавливается связь фотодиодного эффекта с механизмом проводимости. Предложена модель сильных флуктуаций кулоновского потенциала, асимметрия квантовых ям в результате наличия электрической поляризации в пленке и отличие времен термолизации носителей тока и рекомбинации электронов и дырок.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.
Sci Pract Mat Res Ctr NAS Belarus, Minsk, BELARUS.

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Kretinin, V. V.; Masyugin, A. N.; Romanova, O. B.; Романова, Оксана Борисовна; Sitnikov, M. N.; Begisheva, O. B.; Galyas, A., I; Demidenko, O. F.; Yanushkevich, K., I; RFBR [18-52-00009 Bel_ a, 18-32-00079 mol_ a]; Belarusian Foundation [F18R-084]; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-42-240001 r_ a]; [3.5743.2017/6.7]
}
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