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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : EDELMAN I. S., GALANOV E. K., KOKOV I. T., MALAKHOVSKII A. V., ANISTRATOV A. T.
Заглавие : ABSORPTION-SPECTRA AND FARADAY-EFFECT IN CS2NANDCL6 AND CS2NAPRCL CRYSTALS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1985. - Vol. 27, Is. 11. - P3467-3470. - ISSN 0367-3294
Примечания : Cited References: 8
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Sukhachev A. L., Temerov V. L.
Заглавие : Change of the local magnetic properties during f-f transitions in multiferroic Nd0.5Gd0.5Fe3(BO3)4 single crystal
Коллективы : Ultrafast Magnetism Conference
Место публикации : Ultrafast magnetism conf. (UMC 2015): program. - Nijmegen, 2015
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Temerov V. L.
Заглавие : Changes of the local magnetic properties of the optically excited Nd3+ ions and their manifestation in the near IR spectra of the Nd0.5Gd0.5Fe3(BO3)4 crystal
Коллективы : Russian Foundation [16-02-00273]; [Nsh-2886.2014.2]
Место публикации : Opt. Mater.: Elsevier Science, 2016. - Vol. 52. - P.126-133. - ISSN 0925-3467, DOI 10.1016/j.optmat.2015.12.029. - ISSN 1873-1252(eISSN)
Примечания : Cited References: 29. - The work was supported by the Russian Foundation for Basic Researches Grant 16-02-00273 and by the President of Russia Grant No. Nsh-2886.2014.2.
Предметные рубрики: SINGLE-CRYSTAL
GdFe3(BO3)4
STATES
Ключевые слова (''Своб.индексиров.''): f-f transitions--nd3+ ion--excited states--local magnetic properties
Аннотация: Polarized absorption spectra of f–f transitions 4I9/2 → 4F3/2 and (2H9/2 + 4F5/2) in the Nd3+ ion in the Nd0.5Gd0.5Fe3(BO3)4 single crystal were studied as a function of temperature in the range of 2–40 K and as a function of magnetic field in the range of 0–65 kOe at 2 K. It was found out that the selection rules for f–f electron transitions substantially changed in the magnetically ordered state of the crystal, and they strongly depended on the orientation of the Fe and Nd ions magnetic moments relative to the light polarization. The splitting of the ground and excited states of the Nd3+ ion in the exchange field of the Fe sublattice were determined. It was revealed that the value of the exchange splitting (the exchange interaction) in the excited states did not correlate with the theoretical Landé factors. The Landé factors of the excited states were experimentally found. In general, the local magnetic properties in the vicinity of the excited ion depend substantially on its electron state. In particular: (1) in one of the excited states a weak ferromagnetic moment appears, (2) the changes of type of the local magnetic anisotropy take place in some excited states, and (3) in some excited states the energetically favorable orientation of the Nd3+ ion magnetic moment is opposite to that in the ground state. In some excited states the nonequivalent Nd3+ centers were found out.Поляризованные спектры поглощения F-е переходов 4I9/2 → 4F3/2 и (2H9/2 + 4F5/2) в иона Nd3+ в Nd0.5Gd0.5Fe3(BO3)4 монокристалл изучались как функции температуры в интервале 2-40 K и в зависимости от магнитного поля в диапазоне 0-65 кЭ при 2 К. Выяснилось, что Правила отбора для F-F электронных переходов существенно изменился в магнитно-упорядоченном состоянии кристалла, и они сильно зависели от ориентации магнитных моментов ионов Fe и Nd по отношению к поляризация света. Расщепление основного и возбужденного состояний иона Nd3+ в обменном поле подрешетки Fe были определены. Было выявлено, что величина обменного расщепления (обменное взаимодействие) в возбужденных состояниях не коррелируют с теоретическими факторами Ланде. Факторы Ланде возбужденных состояний были найдены экспериментально. В целом, локальные магнитные свойства в непосредственной близости от возбужденного иона существенно зависят от его электронного состояния. В частности: (1) в одном из возбужденной состояния появляется слабый ферромагнитный момент, (2) изменения типа локальных магнитной анизотропии происходит в некоторых возбужденных состояниях, и (3) в некоторых возбужденных состояниях энергетически благоприятных ориентация иона Nd3+ магнитного момента противоположны тем, что в основном состоянии. В некоторых возбужденных состояниях были обнаружены неэквивалентные центры Nd3+.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhachev A. L., Malakhovskii A. V., Nelson C. S., Gudim I. A., Temerov V. L.
Заглавие : Comparison of the absorption spectra of Nd3+ ions in the NdFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and Ho0.75Nd0.25Fe3(BO3)4 crystals
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 1. - P.113-121. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783421010200
Примечания : Cited References: 21. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: number 19-42-240003 “Influence of the local en-vironment on magneto-optical properties of f–f transitions in rare-earth aluminum and iron borates”
Аннотация: The polarized optical absorption spectra in the region of a series of the f–f transitions of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and NdFe3(BO3)4 crystals at 90 K have been compared. The spectral features related to the difference in the local environment of Nd3+ ions in these crystals have been established. In the region of the transition 4I9/2 → 4G5/2 + 2G7/2 of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4 crystal, the appearance of some absorption lines at the structural transition R32 → P3121 around ~200 K due to the local symmetry variation has been found. The intensity of these lines smoothly increases with a decrease in temperature from the transition point. The temperature dependence of the lattice parameters of the Ho0.75Nd0.25Fe3(BO3)4 crystal has been measured. It has been found that, at the transition temperature, the lattice parameter a changes stepwise, which is indicative of the occurrence of a first-order phase transition. The lattice parameter c changes smoothly.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Sukhachev A. L., Temerov V. L.
Заглавие : Electron transitions and local properties of Nd3+ ion in Nd0.5Gd0.5Fe3(BO3)4 single crystal
Коллективы : International Feofilov Symposium on spectroscopy of crystals doped with rare earth and transition metal ions
Место публикации : Abstract book of the XVI International Feofilov Symposium on spectroscopy of crystals doped with rare earth and transition metal ions (IFS'XVI). - 2015
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Sukhachev A. L., Temerov V. L.
Заглавие : Electron transitions and local properties of Nd3+ ion in Nd0.5Gd0.5Fe3(BO3)4 single crystal [Electronic resource]
Место публикации : ArXiv. - 2015. - Ст.arXiv:1507.04210
Примечания : Cited References: 45. - The work was supported by the President of Russia grant No Nsh-2886.2014.2
Предметные рубрики: Condensed matter-- Strongly correlated electrons
Condensed matter-- Materials science
Ключевые слова (''Своб.индексиров.''): f-f transitions--nd3+ ion--excited states--local magnetic properties
Аннотация: Polarized absorption spectra and magnetic circular dichroism (MCD) spectra of Nd0.5Gd0.5Fe3(BO3)4 single crystal were measured in the range of 10000 - 21000 cm-1. The absorption spectra were studied as a function of temperature in the range of 2 - 293 K and as a function of magnetic field 0 - 65 kOe at 2 K. The excited 4f states of the Nd3+ ion were identified in terms of the irreducible representations and in terms of |J,+-MJ wave functions of the free atom. The changes of the Lande factor during f-f transitions and the exchange splitting of the ground and excited states were determined. It was found out that the selection rules for electron transitions substantially changed in the magnetically ordered state of the crystal. They are different for the different transitions and they strongly depend on the orientation of the Fe sublattice magnetic moment relative to the light polarization. It was revealed that the local magnetic properties in the vicinity of the excited Nd3+ ion substantially depended on its state. In particular, in some excited states a weak ferromagnetic moment appears, the field induced reorientation magnetic transitions occur and the changes of the local magnetic anisotropy type take place. In some excited states the nonequivalent Nd3+ centers were found out.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhachev A. L., Malakhovskii A. V., Nelson C. S., Gudim I. A., Temerov V. L.
Заглавие : Erratum to: Comparison of the absorption spectra of Nd3+ ions in the NdFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and Ho0.75Nd0.25Fe3(BO3)4 crystals (Physics of the Solid State, (2021), 63, 1, (113-121), 10.1134/S1063783421010200)
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 3. - P.511. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783421030203
Аннотация: Section Funding should read as follows: The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project No. 19-42-240003 “Influence of the local environment on magnetooptical properties of f-f transitions in rare-earth aluminum and iron borates” and the Russian Foundation for Basic Research, project No. 19-02-00034.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Gavrichkov V. A., Polukeev S. I., Malakhovskii A. V.
Заглавие : Exchange interaction between excited states of magnetic ions
Коллективы : 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", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : 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. 2. - Ст.H.I1. - P.36-37. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 8. - Support by RSF grant 18-12-00022 is acknowledged
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Gavrichkov V. A., Polukeev S. I., Malakhovskii A. V.
Заглавие : Exchange Interaction between the Excited States of Magnetic Ions
Место публикации : Phys. Metals Metallogr. - 2019. - Vol. 120, Is. 13. - P.91-94. - ISSN 0031-918X (ISSN), DOI 10.1134/S0031918X19130210. - ISSN 1555-6190 (eISSN)
Примечания : Cited References: 11. - This work was supported by the Russian Science Foundation, project no. 18-12-00022.
Аннотация: Within the framework of the LDA + GTB multi-electron approach to the electron structure of Mott–Hubbard insulators a scheme is developed for constructing the effective low-energy Hamiltonian that includes not only the ground state of the magnetic cation, but also the excited terms. The mathematical apparatus of the theory are Hubbard operators built on the many-electron states of the cation in the dn configuration. The occupation of the excited term under optical pumping can change the sign of the exchange interaction of the excited cation with the neighboring cation in the ground state. Another variant of the occupation of the excited states is connected with a spin crossover when the excited and the ground terms change over, for example, at high pressure. Examples are given for such crystals as FeBO3, Nd0.5Gd0.5Fe3(BO3)4 and NiO.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Gudim I. A.
Заглавие : Features of the local magnetic structure of HoFe3(BO3)4 crystal in 5F2 and 5F3 excited states of Ho3+ ion
Коллективы : Федеральный исследовательский центр "Красноярский научный центр Сибирского отделения Российской академии наук", Институт физики им. Л.В. Киренского Сибирского отделения РАН, Сибирский федеральный университет, "Енисейская фотоника", Всероссийская научная конференция с международным участием
Место публикации : Енисейская фотоника-2020: тезисы докладов. - Красноярск: ИФ СО РАН, 2020. - P.125-126. - ISBN 978-5-6042995-8-6 (Шифр В34/Е 63-418308835)
Примечания : Cited References: 2
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Malakhovskii A. V., Ovchinnikov S. G.
Заглавие : Effect of optical f - f excitations on the Nd-Fe exchange interaction in Nd ferroborate with multiferroic properties
Коллективы : 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
Место публикации : Phys. Rev. B. - 2021. - Vol. 104, Is. 6. - Ст.064445. - ISSN 2469-9950, DOI 10.1103/PhysRevB.104.064445. - ISSN 2469-9969(eISSN)
Примечания : 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
Предметные 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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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gavrichkov V. A., Malakhovskii A. V., Ovchinnikov S. G.
Заглавие : Nd-Fe exchange interaction in Nd ferroborate with multiferroic properties under optical pumping
Коллективы : "Functional materials", International conference, Крымский федеральный университет имени В.И. Вернадского
Место публикации : Ovchinnikov S. G. International conference "Functional materials": book of abstracts/ ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P.253-254
Примечания : 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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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sukhachev A. L., Sokolov V. V., Gudim, I. A.
Заглавие : Giant natural circular dichroism of vibronic transitions in HoAl3(BO3)4
Место публикации : JETP Letters. - 2015. - Vol. 102, Is. 8. - P.493-495. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364015200084
Примечания : Cited References: 15. - This work was supported by the Council of the President of the Russian Federation for the Support of Leading Scientific Schools (project no. NSh-2886.2014.2).
Предметные рубрики: SINGLE-CRYSTAL
OPTICAL-ABSORPTION
SPECTRA
Ho3+
IONS
PR3+
Аннотация: The giant natural optical activity of vibronic replicas of the f–f5/8 → 5F2 transition in HoAl3(BO3)4 is observed. It exceeds the optical activity related to purely electronic transitions by two orders of magnitude and corresponds to the almost complete circular polarization of the transitions. This effect is explained by the local distortions of the crystal in the excited electronic state, which lead to the mixing of electron and vibrational wavefunctions and, as a consequence, to the delocalization of the vibronic wavefunction and the enhancement of spatial dispersion, which is responsible for the optical activity.
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Eremin E. V., Velikanov D. A., Kartashev A. V., Vasil'ev A. D., Gudim I. A.
Заглавие : Hysteresis in magnetization of Nd0.5Gd0.5Fe3(B03)4 single crystal
Коллективы : "Spin Waves", International Simposium, Физико-технический институт им. А.Ф. Иоффе РАН
Место публикации : Spin Waves 2011, Int. Symp.: program, abstracts. - СПб., 2011. - P.52
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Sukhachev A. L., Sokolov A. E., Temerov V. L., Gudim, I. A.
Заглавие : Influence of f-f electron transitions on the local properties in vicinity of the excited ions in trigonal alumo- and ferroborates
Коллективы : International Feofilov symposium on spectroscopy of crystals doped with rare earth and transition metal ions (15; 2013 ; Sept. ; 16-20; Казань)
Место публикации : XV Int. Feofilov symp. on spectroscopy of crystals doped with rare earth and transition metal ions. - Kazan, 2013. - Ст.PI_4. - P.112
Аннотация: Представлены результаты изучения спектров поглощения кристаллов TbFe3(BO3)4, TmAl3(BO3)4, YbAl3(BO3)4, DyFe3(BO3)4 и Nd0.5Gd0.5Fe3(BO3)4. Показано, что геометрия локального окружения и локальные магнитные свойства могут меняться в процессе f-f электронных переходов.
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16.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sukhachev A. L., Strokova A. Yu., Malakhovskii A. V.
Заглавие : Influence of Glass Matrix on Magneto-Optical Activity of f-f Transitions in Dy(3+) Ion
Коллективы : Russian Acad Sci, Inst Metal Phys, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Solid State Phenomena. - 2011. - Vol. 168-169. - P.557-560. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.168-169.557
Примечания : Cited Reference Count: 4
Предметные рубрики: Materials Science, Multidisciplinary
Physics, Condensed Matter
Ключевые слова (''Своб.индексиров.''): magnetic circular dichroism--magneto-optical activity--rare earth glasses
Аннотация: The absorption and magnetic circular dichroism spectra of f-f transitions (6)H(15/2) - (6)F(3/2), (6)F(5/2), (6)(F(7/2) + H(5/2)) and (6)(F(9/2) + H(7/2)) in Dy(3+) ion were studied in the glasses: Dy(2)O(3)-P(2)O(5)-SiO(2)-GeO(2) and Dy(2)O(3)-La(2)O(3)-Al(2)O(3)-B(2)O(3)-SiO(2)-GeO(2) with different concentrations of Dy(3+) ions in temperature range 100-300 K. :Basing on this data, absolute values and temperature dependences of the paramagnetic magneto-optical activity (MOA) of the transitions were determined. The origin of the MOA of f-f transitions was analyzed with the help of two models. In the first model, MOA is considered as a consequence of admixture of states with opposite parity by odd components of crystal field. The second approach is based on the Judd-Ofelt theory. The same f-f transitions reveal different values and temperature dependences in different glasses, what testifies to a different symmetry of the nearest environment of Dy(3+) ions in these glasses.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Sukhachev A. L., Temerov V. L.
Заглавие : Influence of magnetic ordering on electronic structure of Tb3+ ion in TbFe3(BO3)(4) crystal
Место публикации : Eur. Phys. J. B. - NEW YORK: SPRINGER, 2011. - Vol. 80, Is. 1. - С. 1-10. - MAR. - ISSN 1434-6028, DOI 10.1140/epjb/e2011-10806-x. - ISSN 1434-6036
Примечания : Cited Reference Count: 28. - Russian Foundation for Basic ResearchesRussian Foundation for Basic Research (RFBR) [09-02-00171-a]; OFN RAS [2.3.3.1], The work was supported by the Russian Foundation for Basic Researches grant No. 09-02-00171-a, and by OFN RAS Program 2.3.3.1.
Предметные рубрики: Physics, Condensed Matter
Аннотация: Optical absorption spectra of trigonal crystal TbFe3(BO3)(4) have been studied in the region of F-7(6) - D-5(4) transition in Tb3+ ion depending on temperature (2-220 K) and on magnetic field (0-60 kOe). Splitting of the Tb3+ excited states, both under the influence of the external magnetic field and effective exchange field of the Fe-sublattice, have been determined. Land, factors of the excited states have been found. Stepwise splitting of one of the absorption lines has been discovered in the region of the Fe-sublattice magnetic ordering temperature. This is shown to be due to the abrupt change of equilibrium geometry of the local Tb3+ ion environment only in the excited state of the Tb3+ ion. In general, the magnetic ordering is accompanied by temperature variations of the Tb3+ local environment in the excited states. The crystal field splitting components have been identified. In particular, it has been shown that the ground state (in D (3) symmetry approximation) consists of two close singlet states of A (1) and A (2) type, which are split and magnetized by effective exchange field of the Fe-sublattice. Orientations of magnetic moments of the excited electronic states relative to that of the ground state have been experimentally determined in the magnetically ordered state of the crystal. A pronounced shift of one of absorption lines has been observed in the vicinity of the TbFe3(BO3)(4) structural phase transition. The temperature interval of coexistence of the phases is about 3 K.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Sukhachev A. L., Temerov V. L.
Заглавие : Influence of magnetic ordering on electronic structure of Tb3+ ion in TbFe3(BO3)(4) crystal
Разночтения заглавия :авие SCOPUS: Influence of magnetic ordering on electronic structure of Tb 3+ ion in TbFe 3(BO 3) 4 crystal
Место публикации : Eur. Phys. J. B: SPRINGER, 2011. - Vol. 80, Is. 1. - P1-10. - ISSN 1434-6028, DOI 10.1140/epjb/e2011-10806-x
Примечания : Cited References: 28. - The work was supported by the Russian Foundation for Basic Researches grant No. 09-02-00171-a, and by OFN RAS Program 2.3.3.1.
Ключевые слова (''Своб.индексиров.''): abrupt change--absorption lines--crystal-field splitting--equilibrium geometries--exchange fields--excited electronic state--external magnetic field--ion environment--local environments--magnetic ordering--magnetic ordering temperatures--magnetically ordered state--optical absorption spectrum--singlet state--structural phase transition--sub-lattices--temperature intervals--temperature variation--absorption--crystal orientation--electric excitation--electronic structure--ground state--ions--light absorption--magnetic fields--magnetic moments--excited states
Аннотация: Optical absorption spectra of trigonal crystal TbFe3(BO3)(4) have been studied in the region of F-7(6) - D-5(4) transition in Tb3+ ion depending on temperature (2-220 K) and on magnetic field (0-60 kOe). Splitting of the Tb3+ excited states, both under the influence of the external magnetic field and effective exchange field of the Fe-sublattice, have been determined. Land, factors of the excited states have been found. Stepwise splitting of one of the absorption lines has been discovered in the region of the Fe-sublattice magnetic ordering temperature. This is shown to be due to the abrupt change of equilibrium geometry of the local Tb3+ ion environment only in the excited state of the Tb3+ ion. In general, the magnetic ordering is accompanied by temperature variations of the Tb3+ local environment in the excited states. The crystal field splitting components have been identified. In particular, it has been shown that the ground state (in D (3) symmetry approximation) consists of two close singlet states of A (1) and A (2) type, which are split and magnetized by effective exchange field of the Fe-sublattice. Orientations of magnetic moments of the excited electronic states relative to that of the ground state have been experimentally determined in the magnetically ordered state of the crystal. A pronounced shift of one of absorption lines has been observed in the vicinity of the TbFe3(BO3)(4) structural phase transition. The temperature interval of coexistence of the phases is about 3 K.
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19.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A.V., Sukhachev A.L., Vasil’ev A.D., Leont’ev A.A., Kartashev A.V., Temerov V.L., Gudim I.A.
Заглавие : Influence of partial substitution of iron by gallium on optical properties of GdFe3(bo3)4
Коллективы : "Физика диэлектриков", международная конференция
Место публикации : Физика диэлектриков (Диэлектрики-2011): материалы XII Междунарю конф. - СПб.: Изд-во Российского гос. пед. ун-та им. А. И. Герцена, 2011. - Т. 1. - С. 171-174
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Malakhovskii A. V., Potseluyko A. M., Zarubina T. V., Zamkov A. V.
Заглавие : Intensities f-f transitions in Pr3+ and Dy3+ in glasses in the near-IR spectral range
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2001. - Vol. 43, Is. 6. - P1037-1042. - ISSN 1063-7834, DOI 10.1134/1.1378142
Примечания : Cited References: 21
Предметные рубрики: OXIDE GLASSES
Аннотация: The absorption spectra of Pr3+ and Dy3+ ions in three glass matrices (SiO2-P2O5-GeO2, Al2O3-B2O3-SiO2, and LiB3O5) are thoroughly studied in the near-IR spectral range (4600-14 300 cm(-1)). The temperature dependences of the intensity, the width, and the location of the absorption bands observed are investigated for the first time. It is shown that the f-f transitions in the studied glasses ate allowed by static odd distortions in the environment of the rare-earth ions and these distortions decrease with an increase in temperature. A comparative analysis of the absorption band parameters and their temperature behavior in different materials makes it possible to determine the differences in magnitudes, symmetries, and dispersions of the distortions in the nearest environment of rare-earth ions in different glasses. (C) 2001 MAIK "Nauka/Interperiodica".
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