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    Giant hydrogen effect on the structure and physical properties of ZnO and Co-doped ZnO films fabricated by the RF magnetron sputtering in Ar + H2 atmosphere / I. S. Edelman [et al.] // J. Magn. Magn. Mater. - 2019. - Vol. 489. - Ст. 165461, DOI 10.1016/j.jmmm.2019.165461. - Cited References: 39. - The work is supported by the Russian Academy of Sciences in the frames of Project No 0356-2017-0030 and by the Ministry of Science and Technology of Taiwan MOST 106-2112-M-110-001. . - ISSN 0304-8853. - ISSN 1873-4766
   Перевод заглавия: Колоссальное влияние водорода на структуру и физические свойства пленок ZnO и ZnO допированных кобальтом, полученных методом высокочастотного магнетронного распыления в атмосфере аргона и водорода

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
MAGNETOOPTICAL PROPERTIES
OPTICAL-PROPERTIES
FERROMAGNETISM
Кл.слова (ненормированные):
ZnO films -- Co-doped ZnO films -- Films hydrogenation -- Magnetic circular -- dichroism -- Room temperature ferromagnetism
Аннотация: ZnO and Co-doped ZnO films were synthesized by the radio frequency magnetron sputtering in mixed atmosphere of Ar + 20% O2 and Ar + 20–50% H2. The morphology, chemical composition, crystal structure, optical transmission, electrical resistance, and magnetic circular dichroism of the films were investigated. It was established that the films thickness decreased several times when Ar was partly replaced by hydrogen in the sputtering chamber. At the same time, for the Co-doped ZnO films, the increase in the relative Co content with the increasing hydrogen concentration was observed. These phenomena are explained by the formation of gaseous ZnH2 because of the hydrogen reaction with the growing films under the conditions of the high substrate temperature (450 °C) and, respectively, the decrease in the Zn component in the films. The hydrogenated Co-doped ZnO films exhibit an increase in electric conductivity and ferromagnetic behavior at room temperature. The magnetic nature of the films is explained by a combination of the intrinsic ferromagnetism (due to the formation of the Co-H-Co complex) with the inclusion of metallic Co clusters.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Natl Sun Yat Sen Univ, Dept Phys, Kaohsiung 80424, Taiwan.
Natl Univ Kaohsiung, Dept Appl Phys, Kaohsiung 81148, Taiwan.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
ESRF, CS 40220, F-38043 Grenoble, France.

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Chou, Hsiung; Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Petrov, D. A.; Петров, Дмитрий Анатольевич; Lin, Hsien C.; Chan, Wen L.; Sun, Shih-Jye; Zharkov, S. M.; Жарков, Сергей Михайлович; Bondarenko, G. V.; Бондаренко, Геннадий Васильевич; Platunov, M. S.; Платунов, Михаил Сергеевич; Rogalev, A.; Russian Academy of Sciences [0356-2017-0030]; Ministry of Science and Technology of Taiwan [MOST 106-2112-M-110-001]
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    Magnetic and magneto-optical properties of Fe3O4 nanoparticles modified with Ag / D. A. Petrov [et al.] // J. Magn. Magn. Mater. - 2020. - Vol. 493. - Ст. 165692, DOI 10.1016/j.jmmm.2019.165692. - Cited References: 45. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project № 18-42-243021 and by Joint Research Project of Russian Foundation for Basic Research № 19-52-52002 and Ministry of Science and Technology, Taiwan MOST № 108-2923-M-153-001-MY3 and № 106-2112-M-153-001-MY3. . - ISSN 0304-8853
   Перевод заглавия: Магнитные и магнитооптические свойства наночастиц Fe3O4, модифицированных серебром
Кл.слова (ненормированные):
Fe3O4–Ag nanostructures -- Superparamagnetism -- Magnetic circular dichroism
Аннотация: Effect of Ag inclusions on magnetic properties and magnetic circular dichroism (MCD) of Fe3O4 nanoparticles (NPs) in the mixed system of Fe3O4 and Ag NPs in dependence on the relative concentration of the components is presented. The samples were synthesized by the thermal decomposition of the mixture of constant concentration of Fe(NO3)3·9H2O and varied concentration of AgNO3. The synthesized powdered samples consisted of Fe3O4 and Ag NPs located very close with each other, and in the most cases the Fe3O4 NPs were bordered with the Ag nanocrystals. The Ag introducing in the samples does not effect, practically, in the Fe3O4 NPs morphology and size distribution. At the same time, Ag NPs in the powdered samples cause a decrease in the Fe3O4 NPs magnetization and shift of the blocking temperature to lower temperatures, both approximately proportional to the Ag concentration. Most significant changes are revealed in the MCD spectra in the energy region of 1.2–2.2 eV. We have discussed the influence of the Ag NPs on the MCD spectra features in terms of the charge-transfer electron transitions. © 2019 Elsevier B.V.

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Держатели документа:
Kirensky Institute of Physics SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodny Av., 79, Krasnoyarsk, 660041, Russian Federation
National Pingtung University, Pingtung City, Pingtung County 90003, Taiwan

Доп.точки доступа:
Petrov, D. A.; Петров, Дмитрий Анатольевич; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lin, C. -R.; Tso, C. -T.; Hsu, H. -S.; Tseng, Y. -T.; Lin, E. -S.; Edelman, I. S.; Эдельман, Ирина Самсоновна
}
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Magnetic circular dichroism of 5 I8 5F5 transition in HoAl3(BO3)4 and HoFe3(BO3)4 crystals / V. V. Sokolov [et al.] // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 1. - Ст. E.P2. - P. 423-424. - Cited References: 4. - Support by the Russian Foundation for Basic Researches grant 19-02-00034 is acknowledged . - ISBN 978-5-9500855-7-4

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

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Sokolov, V. V.; Соколов, Валерий Владимирович; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gudim, I. A.; Гудим, Ирина Анатольевна; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
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Element selective magnetism in Ho0.5Nd0.5Fe3(BO3)4 single crystal probed with hard X-ray magnetic circular dichroism / M. Platunov [et al.] // J. Magn. Magn. Mater. - 2019. - Vol. 479. - P. 312-316, DOI 10.1016/j.jmmm.2019.02.040. - Cited References: 40. - The study was supported in part by the grants of the Russian Foundation for Basic Research (project Nos. 16-32-60049, 17-02-00826, 18-42-243007) and the Foundation for Assistance to Small Innovative Enterprises (FASIE, UMNIK program). The magnetic measurements were carried out in the Shared Facility Centre of P.N. Lebedev Physical Institute of RAS. We are grateful to Dr. Alexey Bosak for providing assistance of the structural experiments on the ID28 beamline. We are also grateful to Dr. Evgeniy Eremin from Kirensky Institute of Physics for providing the results of magnetic measurements and for useful discussions. The authors thank the ID12 beamline staffs for help during the XMCD experiment and also gratefully acknowledge the beamtime provision (proposal HC-1804) by the ESRF. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
MICROSTRUCTURE
TRANSITIONS
ND
Кл.слова (ненормированные):
X-ray magnetic circular dichroism -- X-ray absorption -- Magnetic properties
Аннотация: We present a study of a Ho0.5Nd0.5Fe3(BO3)4 single crystal aiming at understanding the roles of each magnetic sublattices in magnetic transitions at low temperatures. The crystal structure is determined to have the R32 symmetry in whole studied temperature range but the crystal appears to be racemic. Element selective magnetic properties studied with X-ray magnetic circular dichroism at the L2,3-edges of Ho and Nd, and at the Fe K-edge at T = 3 K under magnetic fields of ±17 T are compared with the results of macroscopic magnetization measurements in pure and substituted crystals. All three magnetic sublattices are shown to be strongly coupled and to undergo a spin-reorientation transition when magnetic field is applied along the trigonal c-axis. On the contrary, when magnetic field is applied in the ab-plane only the holmium atoms exhibit a sizeable magnetization jump. This result allows us to conclude that the spin-flop transitions observed in macroscopic magnetization curves and associated anomalies of electric polarization are due to the Ho3+ magnetic moment reorientation.

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Akademgorodok 50,Bld 38, Krasnoyarsk 660036, Russia.
European Synchrotron, ESRF, 71 Ave Martyrs CS40220, F-38043 Grenoble 9, France.
Swiss Norwegian Beamlines ESRF, 71 Ave Martyrs CS40220, F-38043 Grenoble 9, France.
RAS, PN Lebedev Phys Inst, Moscow 119991, Russia.

Доп.точки доступа:
Platunov, M. S.; Платунов, Михаил Сергеевич; Kazak, N. V.; Казак, Наталья Валерьевна; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Knyazev, Yu. V.; Князев, Юрий Владимирович; Gavrilkin, S. Yu.; Dyadkin, Vadim; Dovgaliuk, Iurii; Chernyshov, Dmitry; Hen, Amir; Wilhelm, Fabrice; Rogalev, Andrei; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research [16-32-60049, 17-02-00826, 18-42-243007]; Foundation for Assistance to Small Innovative Enterprises (FASIE, UMNIK program)
}
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Magnetic circular dichroism and absorption spectra of 5I8 → 5F5 transition in HoAl3(BO3)4 and HoFe3(BO3)4 single crystals / A. V. Malakhovskii [et al.] // Phys. Lett. A. - 2019. - Vol. 383, Is. 16. - P. 1960-1966, DOI 10.1016/j.physleta.2019.03.016. - Cited References: 34. - The work was supported by the Russian Foundation for Basic Researches grant 19-02-00034. . - ISSN 0375-9601
Кл.слова (ненормированные):
Ho3+ ion -- f-f transitions -- Magnetic circular dichroism -- Electron structure
Аннотация: Comparative study of magnetic circular dichroism (MCD) and absorption spectra of HoAl3(BO3)4 and HoFe3(BO3)4 single crystals in the region of 5I8 → 5F5 transition of the Ho3+ ion was carried out. Absorption spectra were decomposed into the Lorentz shape components and intensities of transitions were obtained. Unusually strong vibronic transitions were observed in HoAl3(BO3)4, but were not observed in HoFe3(BO3)4 that testified to the strong non diagonal vibronic interaction in HoAl3(BO3)4. The MCD spectra were analyzed in approximation of the ∣J,± MJ≻ of the wave functions of the free atom and using concept of the crystal quantum number. Peculiarity of application of this concept to ions with integer moments was revealed and modification of the concept was suggested. With the help of the MCD spectra, the Zeeman splitting of some transitions was found. In particular, the Landé factor gC ≈2 of the ground state of the Ho3+ ion in HoAl3(BO3)4 in the trigonal axis direction was determined. It appeared to be five times less than that in HoFe3(BO3)4 also found with the help of the MCD.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sokolov, V. V.; Соколов, Валерий Владимирович; Gudim, I. A.; Гудим, Ирина Анатольевна; Rautskii, M. V.; Рауцкий, Михаил Владимирович
}
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Paramagnetic magneto-optical activity of f-f transitions in HoFe3(BO3)4 and HoAl3(BO3)4 single crystals / V. V. Sokolov [et al.] // Opt Mater. - 2019. - Vol. 94. - P. 35-40, DOI 10.1016/j.optmat.2019.05.024. - Cited References: 38. - The work was supported by the Russian Foundation for Basic Researches grant 19-02-00034. . - ISSN 0925-3467
Кл.слова (ненормированные):
Magnetic circular dichroism -- f-f transitions -- Rare earth ferroborates -- Rare earth alumoborates
Аннотация: Absorption and magnetic circular dichroism (MCD) spectra of HoFe3(BO3)4 and HoAl3(BO3)4 single crystals were measured as a function of temperature in the range of 90–293 K. Based on integrals of f-f absorption and МСD bands, temperature dependences of the paramagnetic magneto-optical activity (MOA) of f-f transitions were obtained for the first time. It was revealed that MOA of the same f-f transitions in the studied crystals were substantially different and their temperature dependences did not follow the Curie-Weiss law in contrast to the properties of allowed transitions. The observed phenomena were accounted for as a consequence of the nature of f-f transitions allowance. In temperature dependences of the MOA of two transitions the singularities were revealed, which indicated to some local structural distortions in the corresponding excited states.

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Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна
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Magnetic linear dichroism of 5 I8 → 5F3 transition in HoFe3(BO3)4 crystal / A. V. Malakhovskii [et al.] // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov ; чл. прогр. ком. D. M. Dzebisashvili. - 2019. - Vol. 1. - Ст. E.P5. - P. 428-429. - Cited References: 4. - A.V. Malakhovskii acknowledges the support from the Russian Foundation for Basic Researches grant . - ISBN 978-5-9500855-7-4

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Gudim, I. A.; Гудим, Ирина Анатольевна; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
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Competing magnetic states in silicene and germanene 2D ferromagnets / D. V. Averyanov, I. S. Sokolov, M. S. Platunov [et al.] // Nano Res. - 2020. - Vol. 13, Is. 12. - P. 3396-3402, DOI 10.1007/s12274-020-3027-y. - Cited References: 58. - This work was supported by National Research Center (NRC) "Kurchatov Institute" (No. 1359, characterization) and the Russian Science Foundation (No. 19-19-00009 (synthesis) and No. 20-79-10028 (magnetization measurements)). D. V. A. also acknowledges support from the President's scholarship (SP 1398.2019.5). The measurements have been carried out using equipment of the resource centers of electrophysical and electron microscopy techniques in NRC "Kurchatov Institute" . - ISSN 1998-0124. - ISSN 1998-0000

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science,
Рубрики:
RAY CIRCULAR-DICHROISM
ABSORPTION
Кл.слова (ненормированные):
silicene -- germanene -- 2D ferromagnetism -- X-ray magnetic circular dichroism (XMCD) -- monolayer
Аннотация: Two-dimension (2D) magnets have recently developed into a class of stoichiometric materials with prospective applications in ultra-compact spintronics and quantum computing. Their functionality is particularly rich when different magnetic orders are competing in the same material. Metalloxenes REX2 (RE = Eu, Gd; X = Si, Ge), silicene or germanene — heavy counterparts of graphene — coupled with a layer of rare-earth metals, evolve from three-dimension (3D) antiferromagnets in multilayer structures to 2D ferromagnets in a few monolayers. This evolution, however, does not lead to fully saturated 2D ferromagnetism, pointing at a possibility of coexisting/competing magnetic states. Here, REX2 magnetism is explored with element-selective X-ray magnetic circular dichroism (XMCD). The measurements are carried out for GdSi2, EuSi2, GdGe2, and EuGe2 of different thicknesses down to 1 monolayer employing K absorption edges of Si and Ge as well as M and L edges of the rare-earths. They access the magnetic state in REX2 and determine the seat of magnetism, orbital, and spin contributions to the magnetic moment. High-field measurements probe remnants of the bulk antiferromagnetism in 2D REX2. The results provide a new platform for studies of complex magnetic structures in 2D materials.

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Natl Res Ctr Kurchatov Inst, Kurchatov Sq 1, Moscow 123182, Russia.
ESRF European Synchrotron, CS 40220, F-38043 Grenoble 9, France.
ALBA Synchrotron Light Source, Barcelona 08290, Spain.
LOrme Merisiers, Synchrotron SOLEIL, F-91192 Gyf Sur Yvette, France.
RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Akad Gorodok 50,Bld 38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Averyanov, D. V.; Sokolov, Ivan S.; Platunov, M. S.; Платунов, Михаил Сергеевич; Wilhelm, Fabrice; Rogalev, Andrei; Gargiani, Pierluigi; Valvidares, Manuel; Jaouen, Nicolas; Parfenov, Oleg E.; Taldenkov, Alexander N.; Karateev, Igor A.; Tokmachev, Andrey M.; Storchak, V. G.
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    Synthesis and characterization of core-shell magnetic nanoparticles NiFe2O4@Au / D. Saykova, S. Saikova, Y. Mikhlin [et al.] // Metals. - 2020. - Vol. 10, Is. 8. - Ст. 1075, DOI 10.3390/met10081075. - Cited References: 45 . - ISSN 2075-4701
   Перевод заглавия: Синтез и характеристика магнитных наночастиц ядро-оболочка NiFe2O4@Au

РУБ Materials Science, Multidisciplinary + Metallurgy & Metallurgical
Рубрики:
NICKEL FERRITE NANOPARTICLES
   GOLD NANOPARTICLES
   OXIDATION
   REDUCTION
Кл.слова (ненормированные):
nickel ferrite nanoparticles -- NiFe2O4@Au core-shell nanoparticles -- synthesis -- X-ray photoelectron spectroscopy -- magnetic circular dichroism
Аннотация: In this study, NiFe2O4@Au core–shell nanoparticles were prepared by the direct reduction of gold on the magnetic surface using amino acid methionine as a reducer and a stabilizing agent simultaneously. The obtained nanoparticles after three steps of gold deposition had an average size of about 120 nm. The analysis of particles was performed by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis spectroscopy techniques. The results indicate successful synthesis of core–shell particles with the magnetic core, which consists of a few agglomerated nickel ferrite crystals with an average size 25.2 ± 2.0 nm, and the thick gold shell consists of fused Au0 nanoparticles (NPs). Magnetic properties of the obtained nanoparticles were examined with magnetic circular dichroism. It was shown that the magnetic behavior of NiFe2O4@Au NPs is typical for superparamagnetic NPs and corresponds to that for NiFe2O4 NPs without a gold shell. The results indicate the successful synthesis of core–shell particles with the magnetic nickel ferrite core and thick gold shell, and open the potential for the application of the investigated hybrid nanoparticles in hyperthermia, targeted drug delivery, magnetic resonance imaging, or cell separation. The developed synthesis strategy can be extended to other metal ferrites and iron oxides.

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Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Fed Res Ctr,Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk Sci Ctr,Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Saykova, Diana; Saikova, Svetlana; Mikhlin, Yuri; Panteleeva, Marina; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Belova, E.
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10.

    Magnetooptics of nanocomposites based on iron chalcogenide nanoparticles / R. Ivantsov, D. Petrov, O. Ivanova [et al.] // Solid State Phenom. - 2020. - Vol. 312. - P. 160-165, DOI 10.4028/www.scientific.net/SSP.312.160. - Cited References: 13. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: № 19-42-240005 «Features of the electronic structure, magnetic properties and optical excitations in nanocrystals of the multifunctional magnetic chalcogenides Fe3S4 and FeSe», by Joint Research Project of Russian Foundation for Basic Research № 19-52-52002 and Ministry of Science and Technology, Taiwan MOST № 108-2923-M-153-001-MY3 and № 106-2112-M-153-001-MY3. . - ISSN 1012-0394. - ISSN 1662-9779
   Перевод заглавия: Магнитооптика нанокомпозитов на основе наночастиц халькогенида железа
Кл.слова (ненормированные):
iron selenide -- iron sulphide -- magnetic circular dichroism -- magnetic properties -- nanoparticles
Аннотация: Morphology, structure, magnetic properties and magnetic circular dichroism (MCD) were studied for the FexSy and FexSey nanoparticles (NPs) synthesized with the polyol mediated and the thermal decomposition processes, correspondingly, at different regimes. For all NPs samples, but Fe3S4, MCD was measured for the first time. It has been shown that in the case of sulfides, the character of the MCD spectrum changes as the NPs phase composition transforms from Fe3S4 to FeS with the synthesis temperature increase. At the same time, the shape of the MCD spectrum is almost independent of the NPs phase in the case of iron selenides.

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Опубликовано в другом издании Magnetooptics of nanocomposites based on iron chalcogenide nanoparticles [Текст] / R. D. Ivantsov, D. A. Petrov, O. S. Ivanova [et al.] // The Fifth Asian School-Conference on Physics and Technology of Nanostructured Materials : Proceedings. - VLadivostok : Dalnauka Publishing, 2020.- Ст.IV.03.05o.- P.105

Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
National Pingtung University, Pingtung City, Pingtung County, 90003, Taiwan

Доп.точки доступа:
Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Petrov, D. A.; Петров, Дмитрий Анатольевич; Ivanova, O. S.; Иванова, Оксана Станиславовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Zharkov, S. M.; Жарков, Сергей Михайлович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Lin, Chun-Rong; Asian School-Conference on Physics and Technology of Nanostructured Materials(5 ; 2020 ; 30 Jul - 3 Aug ; Vladivostok); Азиатская школа-конференция по физике и технологии наноструктурированных материалов(5 ; 2013 ; 30 июля - 3 авг. ; Владивосток)
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11.

    Magnetic circular dichroism in the canted antiferromagnet α-Fe2O3: bulk single crystal and nanocrystals / R. Ivantsov [et al.] // J. Magn. Magn. Mater. - 2020. - Vol. 498. - Ст. 166208, DOI 10.1016/j.jmmm.2019.166208. - Cited References: 60. - The authors thank S.L. Sukhachev for help in conducting absorption experiments and S.G. Ovchinnikov for fruitful discussions. The work is supported by Russian Academy of Sciences in the frame of the Project № 0356-2017-0030. . - ISSN 0304-8853. - ISSN 1873-4766
   Перевод заглавия: Круговой магнитный дихроизм в антиферромагнетике α-Fe2O3: объемный монокристалл и нанокристаллы
Кл.слова (ненормированные):
Hematite -- α-Fe2O3 -- optical absorption -- magnetic circular dichroism -- ellipsometric parameters -- Raman scattering -- one-ion d-d transitions -- pare exciton-magnon transitions
Аннотация: Hematite, α-Fe2O3, is a canted antiferromagnet with the Neel temperature of 960 K. The Morin transition, which occurs when the temperature is lowered to ∼260 K, when the magnetic moments of the sublattices become strictly antiparallel to each other and the resulting magnetic moment disappears, is a characteristic feature of this compound. Detailed investigations are presented here of the magneto-optical effects in the α-Fe2O3 nanoparticles in the transmitted light and in the α-Fe2O3 single crystal in the reflected light. Two types of magneto-optic features were revealed in the magnetic circular dichroism (MCD) spectrum. Some of them described by the Gauss line shape were associated with one-ion d-d transitions. Others were described by the S-shaped line with the inflection points corresponding to the absorption maxima. Last features were assigned to the pair exciton-magnon transitions. An exceptionally strong S-shaped line at 2.0-2.5 eV appeared to be a unique feature of α-Fe2O3 distinguishing it from other iron oxide compounds. The origin of the high effectiveness of the pair exciton-magnon interaction giving rise to this strong S-shaped feature in the MCD spectrum of α-Fe2O3 is discussed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk,660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia

Доп.точки доступа:
Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Ivanova, O. S.; Иванова, Оксана Станиславовна; Zharkov, S. M.; Жарков, Сергей Михайлович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Krylov, A. S.; Крылов, Александр Сергеевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Edelman, I. S.; Эдельман, Ирина Самсоновна
}
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12.

Malakhovskii, A. V.
Magnetic circular dichroism and absorption spectra of f–f transitions 5I8 → 5F2 and 5F3 in the HoFe3(BO3)4 single crystal / A. V. Malakhovskii, V. V. Sokolov, I. A. Gudim // Low Temp. Phys. - 2020. - Vol. 46, Is. 7. - P. 734-739, DOI 10.1063/10.0001371. - Cited References: 16. - The study was supported by the Russian Foundation for Basic Research, grant No. 19-02-00034, and also by the Krasnoyarsk Krai Russian Foundation for Basic Research and the Krasnoyarsk Krai Regional Fund of Science as part of project No. 19-42-240003 on "The influence of the local environment on the magneto-optical properties of f-f transitions in rare-earth aluminoborates and ferroborates" . - ISSN 1063-777X. - ISSN 1090-6517

РУБ Physics, Applied
Рубрики:
MAGNETOOPTICAL ACTIVITY
ELECTRON-STRUCTURE
ERFE3(BO3)4
Кл.слова (ненормированные):
magnetic circular dichroism -- f-ftransitions -- rare earth ferroborates
Аннотация: Magnetic circular dichroism (MCD) and absorption spectra of multiferroic HoFe3(BO3)4 of 5I8 → 5F2 and 5F3 f–f transitions are measured at T = 90 K. The absorption spectra are expanded into Lorentzian components, and the transition intensities are obtained. The Zeeman splitting of some transitions is determined using the MCD and absorption spectra. The MCD spectra and Zeeman splitting are theoretically analyzed in the free-atom |J, ±MJ〉wave function approximation by using the concept of a crystalline quantum number. An inconsistency is revealed when this concept is applied to ions with an integer moment, and a modification of the concept is proposed. Anomalously intense vibronic repetitions of electronic transitions from excited sublevels of the ground multiplet are found.

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Публикация на русском языке Малаховский, Александр Валентинович. Магнитный круговой дихроизм и поглощение кристалла HoFe3(BO3)4 в области f–f переходов 5I8 → 5F2 и 5F3 [Текст] / А. В. Малаховский, В. В. Соколов, И. А. Гудим // Физ. низких температур. - 2020. - Т. 46 № 7. - С. 869-876

Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Gudim, I. A.; Гудим, Ирина Анатольевна; Малаховский, Александр Валентинович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-02-00034]; Krasnoyarsk Krai Russian Foundation for Basic Research; Krasnoyarsk Krai Regional Fund of Science [19-42-240003]
}
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13.

Hard X-ray magnetochiral dichroism in a paramagnetic molecular 4f complex / D. Mitcov, M. Platunov, C. D. Buch [et al.] // Chem. Sci. - 2020. - Vol. 11, Is. 31. - P. 8306-8311, DOI 10.1039/d0sc02709j. - Cited References: 74. - SP thanks the VILLUM FONDEN for research grant 13376. SP and DM thank the Danish Ministry of Higher Education and Science for travel support through the Instrument Center DANSCATT. AR thanks the Carlsberg Foundation (grant CF18-0613) and the Independent Research Fund Denmark (grant 9036-00015B) for funding. MP thanks the Russian Science Foundation (grant 19-72-00002) for funding . - ISSN 2041-6520. - ISSN 2041-6539

РУБ Chemistry, Multidisciplinary
Рубрики:
CHIRAL DICHROISM
   SINGLE-CRYSTAL
   SPIN QUBITS
   READ-OUT
   L3-EDGE
Аннотация: Magnetochiral dichroism (MΧD) originates in the coupling of local electric fields and magnetic moments in systems where a simultaneous break of space parity and time-reversal symmetries occurs. This magnetoelectric coupling, displayed by chiral magnetic materials, can be exploited to manipulate the magnetic moment of molecular materials at the single molecule level. We demonstrate herein the first experimental observation of X-ray magnetochiral dichroism in enantiopure chiral trigonal single crystals of a chiral mononuclear paramagnetic lanthanide coordination complex, namely, holmium oxydiacetate, at the Ho L3-edge. The observed magnetochiral effect is opposite for the two enantiomers and is rationalised on the basis of a multipolar expansion of the matter–radiation interaction. These results demonstrate that 4f–5d hybridization in chiral lanthanoid coordination complexes is at the origin of magnetochiral dichroism, an effect that could be exploited for addressing of their magnetic moment at the single molecule level.

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Держатели документа:
Univ Copenhagen, Dept Chem, Univ Pk 5, DK-2100 Copenhagen, Denmark.
ESRF European Synchrotron, CS 40220, F-38043 Grenoble 9, France.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50,Bld 38, Krasnoyarsk 660036, Russia.
Univ Penn, Dept Chem, 231 South 34th St, Philadelphia, PA 19014 USA.

Доп.точки доступа:
Mitcov, D.; Platunov, M. S.; Платунов, Михаил Сергеевич; Buch, C. D.; Reinholdt, A.; Dossing, A. R.; Wilhelm, F.; Rogalev, A.; Piligkos, S.; VILLUM FONDEN [13376]; Carlsberg FoundationCarlsberg Foundation [CF18-0613]; Independent Research Fund Denmark [9036-00015B]; Russian Science FoundationRussian Science Foundation (RSF) [19-72-00002]
}
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14.

Synthesis and characterization of Dy3Fe5O12 nanoparticles fabricated with the anion resin exchange precipitation method / R. Ivantsov [et al.] // Mater. Sci. Eng. B. - 2017. - Vol. 226. - P. 171-176, DOI 10.1016/j.mseb.2017.09.016. - Cited References: 49. - The work was supported partly by the Grant of the President of the Russian Federation – Russia no. NSh-7559.2016.2, and by the Russian Foundation for Basic Research – Russia (RFBR): grant. No. 16-33-00043. . - ISSN 0921-5107
Кл.слова (ненормированные):
Dy3Fe5O12 nanoparticles -- Anion resin exchange precipitation method -- Magnetic circular dichroism
Аннотация: Dysprosium-iron garnet (DyIG) nanoparticles were synthesized with the new modification of the anion resin exchange precipitation method. Fourier transform infrared spectroscopy, X-ray diffraction, and transmission electron microscopy showed nanoparticles to be of the garnet structure with an excellent crystallinity. Magnetic properties were studied by using QUANTUM Design MPMS-XL system and the visible magnetic circular dichroism (MCD). Nanoparticles magnetic properties were close to those of bulk DyIG crystals. Dependence of the nanoparticles magnetization (M) on the external magnetic field (H) is described by a narrow hysteresis loop in relatively low fields and the strong linear M increase with the further H increase. The visible MCD of DyIG was studied in this work for the first time. The MCD spectra consisted of several peaks associated with electron transitions in iron and dysprosium ions located in different spectral intervals. Dependences of the MCD peak intensities on temperature and magnetic field were studied.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center of Krasnoyarsk Science Centre of Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center of Krasnoyarsk Science Centre of Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Evsevskaya, N.; Saikova, S.; Linok, E.; Yurkin, G. Yu.; Юркин, Глеб Юрьевич; Edelman, I. S.; Эдельман, Ирина Самсоновна
}
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15.

    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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16.

    Magnetic circular dichroism of CdTe nanoparticles / A. V. Malakhovskii [et al.] // Phys. Lett. A. - 2018. - Vol. 382, Is. 14. - P. 980-983, DOI 10.1016/j.physleta.2018.02.012. - Cited References: 29. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 17-42-240080 and by Presidium RAS projects 0356-2018-0057 and 0356-2018-0061. . - ISSN 0375-9601
   Перевод заглавия: Магнитный круговой дихроизм наночастиц CdTe
Кл.слова (ненормированные):
CdTe -- Nanoparticles -- Magnetic circular dichroism
Аннотация: Magnetic circular dichroism (MCD) of water-soluble CdTe nanoparticles was observed in the visible spectral range for the first time. Diameter of nanoparticles varied from 2.3 to 4.5 nm. Absorption and photoluminescence spectra were also recorded. Absorption line at 19400 cm−1 and luminescent line at 18200 cm−1 were observed. Splitting of value 960 cm−1 was revealed in the MCD spectrum. Approximately the same splitting was extracted from the absorption spectrum. The MCD was identified as the temperature independent paramagnetic mixing effect. Nature of the absorption line and of its splitting are discussed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Tsipotan, A. S.; Zharkov, S. M.; Жарков, Сергей Михайлович; Zabluda, V. N.; Заблуда, Владимир Николаевич
}
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17.

Malakhovskii, A. V.
Natural optical activity of f-f transitions in ErAl3(BO3)4 single crystal / A. V. Malakhovskii, V. V. Sokolov, I. A. Gudim // Chem. Phys. - 2017. - Vol. 493. - P. 102-110, DOI 10.1016/j.chemphys.2017.06.011. - Cited References: 50. - The work was supported by the Russian Foundation for Basic Researches grant 16-02-00273 and by the President of Russia grant No Nsh-7559.2016.2. . - ISSN 0301-0104
Кл.слова (ненормированные):
f-f transitions -- Natural circular dichroism -- Er3+ ion
Аннотация: Absorption and natural circular dichroism (NCD) spectra of ErAl3(BO3)4 single crystal were measured at 90 K in the range of 10,000–28,200 cm−1. The spectra were decomposed on the Lorentz shape components and the natural optical activities (NOA) of f-f transitions between Stark components of the ground and excited multiplets were found. The NCD spectra permitted us to find out existence of two non equivalent positions of Er3+ ion in one of its excited states, which are due to the local decrease of the crystal symmetry in this state. Very large NOA of a vibronic line was revealed. This phenomenon was accounted for basing on the new quantum mechanical formula for the NOA of electron transitions. The principle difference of the NOA properties of electric dipole allowed and parity forbidden transitions is discussed.

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

Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Gudim, I. A.; Гудим, Ирина Анатольевна; Малаховский, Александр Валентинович
}
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18.

Probing magnetic sublattices in Ho0.5Nd0.5Fe3(BO3)4 single crystal using x-ray magnetic circular dichroism / M. S. Platunov [et al.] // Moscow Int. Symp. on Magnet. (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 2OR-O-9. - P. 114. - Cited References: 3. - This work has been partially financed by the Council for Grants of the President of the Russian Federation (SP-938.2015.5, NSh-7559.2016.2), the Russian Foundation for Basic Research (project nos. 16-32-60049 mol_a_dk, 16-32-00206 mol_a, 17-02-00826_a)

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Доп.точки доступа:
Platunov, M. S.; Платунов, Михаил Сергеевич; Kazak, N. V.; Казак, Наталья Валерьевна; Temerov, V. L.; Темеров, Владислав Леонидович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Wilhelm, Fabrice; Rogalev, A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
}
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19.

    Sokolov, V. V.
    Magnetic circular dichroism spectra and electron structure of ErAl3(BO3)4 single crystal / V. V. Sokolov, A. V. Malakhovskii, I. A. Gudim // Moscow Int. Symp. on Magnet. (MISM-2017) : 1-7 July 2017 : book of abstracts / чл. междунар. конс. комитета С. Г. Овчинников ; чл. нац. конс. комитета Н. В. Волков. - 2017. - Ст. 32PO-12-5. - P. 588. - Cited References: 1
   Перевод заглавия: Московский международный симпозиум по магнетизму

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РИНЦ,
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Доп.точки доступа:
Овчинников, Сергей Геннадьевич \чл. междунар. конс. комитета\; Ovchinnikov, S. G.; Волков, Никита Валентинович \чл. нац. конс. комитета\; Volkov, N. V.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gudim, I. A.; Гудим, Ирина Анатольевна; Соколов, Валерий Владимирович; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
}
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20.

Malakhovskii, A. V.
Influence of the low local symmetry of Er3+ ions on magnetic circular dichroism and absorption spectra of f-f transitions in ErFe3(BO3)4 single crystal / A. V. Malakhovskii, V. V. Sokolov, I. A. Gudim // J. Magn. Magn. Mater. - 2018. - Vol. 465. - P. 700-708, DOI 10.1016/j.jmmm.2018.06.057. - Cited References: 29. - The work was supported by the Russian Foundation for Basic Researches grant 16-02-00273 and by the Project of Russian Academy of Science No. 0356-2017-0030. . - ISSN 0304-8853
Кл.слова (ненормированные):
Er3+ ion -- f-f transitions -- Magnetic circular dichroism -- Rare earth ferroborates
Аннотация: Linearly polarized absorption spectra and magnetic circular dichroism (MCD) spectra of ErFe3(BO3)4 single crystal were measured in the range of 9000–23000 cm−1 at 90 K. The absorption spectra of f-f transitions were decomposed into the Lorentz shape components and intensities of the components were found. MCD spectra permitted us to measure the Zeeman splitting of some transitions and so to determine changes of the Landé factor along the C3 axis of the crystal during these transitions. Optical and magneto-optical properties of f-f transitions in the ErFe3(BO3)4 crystal were compared with those in the ErAl3(BO3)4 crystal. Substantial difference of the properties connected with the difference of the Er3+ ions local symmetry in two crystals was revealed. Large splitting of one of the f-f transitions without magnetic field, which is not possible for the Kramers doublets, was observed. It was explained by appearance of two absorbing centers due to the local decrease of symmetry in the excited state. Appreciable difference of the local vibrations energy in some excited states was revealed.

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

Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Gudim, I. A.; Гудим, Ирина Анатольевна; Малаховский, Александр Валентинович
}
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