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Terahertz spectroscopy of multiferroic EuFe3(BO3)4 / K. N. Boldyrev [et al.] // Phys. Lett. A. - 2012. - Vol. 376, Is. 37. - P. 2562-2564, DOI 10.1016/j.physleta.2012.06.028. - Cited References: 19. - This work was partially supported by the Russian Foundation for Basic Research under Grants No. 10-02-01071-a and No. 09-02-00171-a, by the Ministry of Education and Science under Grant HIII-4828.2012.2, and by the Russian Academy of Sciences under the programs for basic research. . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
SINGLE-CRYSTAL
GDFE3(BO3)4
Кл.слова (ненормированные):
Terahertz spectroscopy -- Multiferroics -- Europium iron borate
Аннотация: The terahertz spectra of a rare-earth iron borate with the huntite structure are obtained for the first time. We study the low-temperature (4.0–90 K) α-polarized transmittance spectra of the EuFe3(BO3)4 single crystal in the region 0.9–6.0 THz. Pronounced shifts of phonon frequencies and appearance of new phonon modes at the temperature T S = 58 K of the R 32 → P 3 1 21 structural phase transition are observed. Additional shifts of phonon frequencies occur at the temperature T N = 34 K of the magnetic ordering of the Fe subsystem, thus evidencing the spin–phonon coupling in this multiferroic material.

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Держатели документа:
[Boldyrev, K. N.
Klimin, S. A.
Popova, M. N.] RAS, Inst Spect, Troitsk 142190, Moscow Region, Russia
[Stanislavchuk, T. N.] New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA
[Bezmaternykh, L. N.] RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Boldyrev, K. N.; Stanislavchuk, T. N.; Klimin, S. A.; Popova, M. N.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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Demidov, A. A.
Magnetic Properties of Sm0.7Ho0.3Fe3(BO3)4 / A. A. Demidov, I. A. Gudim, E. V. Eremin // J. Exp. Theor. Phys. - 2012. - Vol. 115, Is. 5. - P. 815-828, DOI 10.1134/S1063776112100020. - Cited References: 31 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
SPIN REORIENTATION
   EARTH
   GDFE3(BO3)4
   SMFE3(BO3)4
Аннотация: The magnetic properties of a ferroborate single crystal of substituted composition Sm0.7H0.3Fe3(BO3)4 with competing Sm-Fe and Ho-Fe exchange interactions are studied. The measured properties and effects are interpreted in terms of a general theoretical approach based on the molecular field approximation and calculations using the crystal field model for a rare-earth ion. The experimental temperature dependences of the initial magnetic susceptibility in the temperature range 2-300 K, the anomalies in the magnetization curves for B aEuro- c and B aSyen c in fields lower than 1.2 T, and the field and temperature dependences of magnetization in fields lower than 9 T are described. The crystal field parameters and the parameters of the R-Fe and Fe-Fe exchange interactions are determined during the interpretation of the experimental data.

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Публикация на русском языке Демидов, А. А. Особенности магнитных свойств Sm0.7Ho0.3Fe3( BO3)4 / А. А. Демидов // Журнал экспериментальной и теоретической физики : Издательство "Наука", 2012. - Т. 142, № 5. - С. 928-942. - ISSN 0044-4510

Держатели документа:
[Demidov, A. A.] Bryansk State Tech Univ, Bryansk 241035, Russia
[Gudim, I. A.
Eremin, E. V.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660038, Russia

Доп.точки доступа:
Gudim, I. A.; Гудим, Ирина Анатольевна; Eremin, E. V.; Еремин, Евгений Владимирович
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Determination of the magnetic structure of SmFe3(BO3)4 by neutron diffraction: comparison with other RFe3(BO3)4 iron borates / C. Ritter [et al.] // J. Phys.: Condens. Matter. - 2012. - Vol. 24, Is. 38. - Ст. 386002, DOI 10.1088/0953-8984/24/38/386002. - Cited References: 40. - This work was supported by RFBR, grant No. 10-02-00765. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
SPIN REORIENTATION
   EARTH
   GDFE3(BO3)4
   BEHAVIOR
Аннотация: Temperature dependent neutron diffraction studies were performed on SmFe3(BO3)4. The crystallographic structure was determined to stay as R32 over the whole studied temperature range of 2 K ‹ T ‹ 300 K. A magnetic phase transition characterized by the magnetic propagation vector κ = [0 0 3/2] takes place at TN = 34 K. The magnetic structure sees an easy-plane arrangement within the trigonal basal a–b-plane of ferromagnetic layers of iron and samarium having a canting angle of about 70° relative to each other. Neighbouring layers in the c-direction are antiferromagnetically coupled; at 2 K the magnetic moment values amount to μFe = 4.2(1) μB and μSm = 0.8(2) μB. The non-Brillouin type increase of the iron magnetic moment below TN points to a strong Fe–Sm exchange and to the simultaneous appearance of long range magnetic order on both sublattices.

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Держатели документа:
[Ritter, C.] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[Pankrats, A.
Gudim, I.
Vorotynov, A.] RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Ritter, C.; Pankrats, A.I.; Панкрац, Анатолий Иванович; Gudim, I. A.; Гудим, Ирина Анатольевна; Vorotynov, A.M.; Воротынов, Александр Михайлович
}
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Raman scattering under structural and magnetic phase transitions in terbium ferroborate / A. V. Peschanskii [et al.] // Low Temp. Phys. - 2014. - Vol. 40, Is. 2. - P. 171-178, DOI 10.1063/1.4865566. - Cited References: 24 . - ISSN 1063-777X. - ISSN 1090-6517

РУБ Physics, Applied
Рубрики:
SPIN-PHONON INTERACTION
GDFE3(BO3)4
Аннотация: The Raman scattering spectrum of single crystal TbFe3(BO3)4 was studied in the frequency range 3–500 cm−1 at temperatures from 2 to 300 K. It was found that in high- and low-temperature phases there exist additional phonon lines which were not known before. In the high-temperature phase, these lines originate from LO–TO splitting of polar phonons. Appearance of the additional lines in the low temperature phase is due to both a reduction of the crystal symmetry under the phase transition and an increase of the primitive cell volume. It was established that the frequencies of some phonon lines in the magneto-ordered phase are shifted towards the high-energy region upon applying an external magnetic field along the third-order axis. The spectrum of two-magnon Raman scattering was investigated. It was shown that at low temperatures the two-magnon band has a complex shape that reflects specific features in the density of state of the magnon branches. The magnon energy at the Brillouin zone boundary was determined.

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Публикация на русском языке Рамановское рассеяние света при структурном и магнитном фазовых переходах в ферроборате тербия [Текст] / А. В. Песчанский [и др.] // Физ. низких температур : Физико-технический институт низких температур им. Б.И. Веркина НАН Украины, 2014. - Т. 40 Вып. 2. - С. 219-229

Держатели документа:
Natl Acad Sci Ukraine, BI Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Peschanskii, A. V.; Yeremenko, A. V.; Fomin, V. I.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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Infrared absorption spectrum of HoFe3(BO3)4 crystal / S. N. Sofronova [et al.] // Vib. Spectrosc. - 2014. - Vol. 72. - P. 20-25, DOI 10.1016/j.vibspec.2014.02.005. - Cited References: 18. - The work was partially supported by the RFBR through Grants No. 13-02-00825 and 13-02-98041, SS-4828.2012.2. . - ISSN 0924-2031. - ISSN 1873-3697

РУБ Chemistry, Analytical + Chemistry, Physical + Spectroscopy
Рубрики:
MAGNETOELASTIC INTERACTIONS
IRON
GDFE3(BO3)4
Кл.слова (ненормированные):
Holmium ferroborate -- Infrared absorption
Аннотация: Infrared (IR) absorption spectra of HoFe3(BO3)4 crystal have been obtained in spectral range 30–7000 cm−1 at temperatures from 4 to 423 K. Vibrational frequencies have been simulated with ‘Lady’ software package both for high-temperature and low-temperature phases. The experimental spectra have been analyzed on the basis of calculated data, and interpreted within the framework of internal vibrations of ionic complexes of HoFe3(BO3)4 crystal lattice. The spectral range under study was observed to have no Davydov splitting of internal vibrational modes due to unit cell multiplication. No effects of magnetic ordering on the IR spectra of the crystal under study were observed in the low-temperature range.

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Держатели документа:
Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Gerasimova, Y. V.; Герасимова, Юлия Валентиновна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Shestakov, N. P.; Шестаков, Николай Петрович; Ivanenko, A. A.; Иваненко, Александр Анатольевич; RFBR [13-02-00825, 13-02-98041, SS-4828.2012.2]
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    Local magnetic properties of multiferroic Nd0.5Gd0.5Fe3(BO3)4 in the excited states of Nd3+ ion / A. V. Malakhovskii [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 375. - P. 153-163, DOI 10.1016/j.jmmm.2014.09.077. - Cited References: 35. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by the President of Russia grant No Nsh-2886.2014.2. . - ISSN 0304-8853
   Перевод заглавия: Локальные магнитные свойства мультифероика Nd0.5Gd0.5Fe3(BO3)4 в возбужденном состоянии иона Nd3+

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SINGLE-CRYSTAL
NdFe3(BO3)4
GdFe3(BO3)4
Кл.слова (ненормированные):
f-f transitions -- Nd3+ ion -- Excited states -- Local magnetic properties
Аннотация: Polarized absorption spectra of single-crystal Nd0.5Gd0.5Fe3(BO3)4 were studied in the region of the transition 4I9/2>(4G5/2+2G7/2) in Nd3+ ion as a function of temperature (2-34 K) and magnetic field (0-65 kOe). The spectra of natural circular dichroism were measured in the range of 5-40 K. It was found out that the local magnetic properties in the vicinity of the excited ion substantially depended on its state. In particular, a weak ferromagnetic moment appears in some excited states. It was found out that the selection rules for electron transitions in the magnetically ordered state substantially deviated from those in the paramagnetic state of the crystal. They are different for different transitions and they are very sensitive to the orientation of the sublattice magnetic moment relative to the light polarization. In the spectrum of the natural circular dichroism, the transition is revealed which is not observed in the absorption spectrum.
Поляризованные спектры поглощения монокристаллов Nd0.5Gd0.5Fe3 (BO3) 4 изучались в области переход 4 I9 / 2 (4G5 / 2þ27/2), в Nd3+ иона в зависимости от температуры (2-34 К) и магнитного поля (0-65 кЭ). Спектры природного кругового дихроизма были измерены в диапазоне 5-40 К. Было установлено, что локальные магнитные свойства в непосредственной близости от возбужденного иона существенно зависит от его состояния. В частности, в некоторых возбужденных состояниях появляется слабый ферромагнитный момент . Выяснилось, что правила отбора для электронных переходов в магнитоупорядоченных состоянии существенно отклонились от тех, которые в парамагнитного состояния кристалла. Они различны для разных переходов, и они очень чувствительны к ориентации подрешетки магнитного момента по отношению к поляризации света. В спектре естественного кругового дихроизма, проявляется переход , который не наблюдается в спектре поглощения.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Temerov, V. L.; Темеров, Владислав Леонидович; Russian Foundation for Basic Researches [12-02-00026]; President of Russia grant [Nsh-2886.2014.2]
}
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Magneto-optical activity of f–f transitions in ErFe3(BO3)4 and ErAl3(BO3)4 single crystals / A. V. Malakhovskii [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 384. - P. 255-265, DOI 10.1016/j.jmmm.2015.02.051. - Cited References: 44. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by the President of Russia Grant no. Nsh-2886.2014.2. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
CIRCULAR-DICHROISM SPECTRA
   GREEN UP-CONVERSION
   SPECTROSCOPIC PROPERTIES
   OPTICAL-PROPERTIES
   LASER
   Er3+
   ABSORPTION
   GROWTH
   IONS
   GdFe3(BO3)4
Кл.слова (ненормированные):
Magnetic circular dichroism -- Natural circular dichroism -- Rare earth ferroborates -- Rare earth alumoborates -- Electronic structure
Аннотация: Absorption, magnetic circular dichroism and natural circular dichroism spectra of ErFe3(BO3)4 and ErAl3(BO3)4 single crystals were measured as a function of temperature in the range of 90–293 K. It was found out that magneto-optical activity of the same f–f transitions in the studied crystals substantially differed 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 by the nature of f–f transitions allowance. Properties of the transition 4I15/2→4S3/2 were studied in detail. In particular, the Zeeman splitting and the natural optical activity of the absorption lines composed of the transition were determined. The vibronic line with the very large natural optical activity was revealed and identified. Two nonequivalent Er3+ ion positions with the opposite chirality were found out in one of the excited states. Polarization properties of the 4I15/2→4S3/2 transition in the ErFe3(BO3)4 crystal have shown that the local symmetry of Er3+ ion in this crystal in the range of 90–293 K is lower than the D3 one. From the heat capacity measurements it was revealed, that the first order structural phase transition to lower symmetry occurred in ErFe3(BO3)4 at 433–439 K.
Поглощение, магнитный циркулярный дихроизм и спектры природного кругового дихроизма монокристаллов ErFe3(BO3)4 и ErAl3(BO3)4 были измерены в зависимости от температуры в диапазоне 90-293 К. Было обнаружено, что по магнитооптической активности одни и те жеF-F переходы в исследованных кристаллах существенно отличаются и их температурные зависимости не следовать закону Кюри-Вейсса в отличие от свойств разрешенных переходов. Наблюдаемые явления были учтены по характеру F-Fпереходов. Свойства перехода 4I15 / 2 → 4S3 / 2 были детально изучены. В частности, расщепление Зеемана и явление естественной оптической активности линий поглощения, состоящих в переходе были полны решимости. Вибронная линия очень большой естественной оптической активности выявлена и идентифицирована. Две неэквивалентных позиций ионовEr3 + с противоположной хиральности были найдены в одном из возбужденных состояний. Поляризационные свойства 4I15 / 2 → 4S3 / 2 перехода в ErFe3(BO3)4 кристалла показали, что локальная симметрия ионов Er3 + в этом кристалле в диапазоне 90-293 К ниже, чем D3. Из измерений теплоемкости Было обнаружено, что структурный фазовый переход первого типа к более низкой симметрии произошел в ErFe3(BO3) 4 при 433-439 К. Ключевые слова: Магнитный круговой дихроизм; Природные круговой дихроизм; Редкоземельные ферроборатов; Редкоземельныеalumoborates; Электронная структура; 44 источника.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Sokolov, V. V.; Соколов В. В.; Kutsak, T. V.; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Researches [12-02-00026]; President of Russia Grant [Nsh-2886.2014.2]
}
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    Inclined magnetic structure of iron borate PrxY1-xFe3(BO3)4: A neutron diffraction study and crystal-field calculations / C. Ritter [et al.] // Phys. Rev. B. - 2015. - Vol. 91, Is. 13. - Ст. 134416, DOI 10.1103/PhysRevB.91.134416. - Cited References:33. - This paper was supported by the Russian Foundation for Basic Research (Project No. 13-02-12442 ofi_m2). . - ISSN 1098. - ISSN 1550-235X
   Перевод заглавия: Угловая магнитная структура бората железа PrxY1−xFe3(BO3)4: исследование нейтронной дифракции и вычисления кристаллического поля

РУБ Physics, Condensed Matter
Рубрики:
GdFe3(BO3)4
Аннотация: The magnetic structure of the mixed rare-earth system PrxY1−xFe3(BO3)4 has been studied by elastic neutron powder diffraction and magnetic measurements. A spin reorientation from easy axis to easy plane occurs in the concentration range x=0.67–0.45 through the formation of inclined magnetic structures. The inclination of the Fe moments from the basal plane depends on the Pr content and ranges from 67(2)° for x=0.67 to 16(4)∘ for x=0.45 at T=3K. A nonmonotonic change of the inclination angle with temperature is found for all compounds but there is no sign of a spontaneous spin reorientation in the temperature range of magnetic order.

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Держатели документа:
Inst Laue Langevin, F-38042 Grenoble, France
RAS, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Bryansk State Tech Univ, Bryansk 241035, Russia

Доп.точки доступа:
Ritter, C.; Pankrats, A. I.; Панкрац, Анатолий Иванович; Demidov, A. A.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Research [13-02-12442 ofi_m2]
}
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    Probing magnetostructural correlations in multiferroic HoAl3(BO3)4 / H. Zhang [et al.] // Phys. Rev. B. - 2015. - Vol. 92, Is. 10. - Ст. 104108, DOI 10.1103/PhysRevB.92.104108. - Cited References:97. - This work is supported by the U.S.Department of Energy Grant No. DE-FG02-07ER46402. Synchrotron powder x-ray diffraction and x-ray absorption data acquisition were performed at Brookhaven National Laboratory's National Synchrotron Light Source (NSLS). Use of the NSLS was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886. The Physical Properties Measurement System used in the heat capacity measurements was acquired under National Science Foundation Major Research Instrumentation Grant No. DMR-0923032 (American Recovery and Reinvestment Act award). This research used resources of the National Energy Research Scientific Computing Center, a U.S. Department of Energy Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. . - ISSN 1098. - ISSN 1550-235X
   Перевод заглавия: Исследование магнитоструктурной корреляции в мультиферроике HoAl3(BO3)4

РУБ Physics, Condensed Matter
Рубрики:
PAIR DISTRIBUTION FUNCTION
   TOTAL-ENERGY CALCULATIONS
   WAVE BASIS-SET
   FERROELECTRIC POLARIZATION
   DEBYE TEMPERATURES
   SINGLE-CRYSTALS
   HOFE3(BO3)4
   GDFE3(BO3)4
   DIFFRACTION
   FEATURES
Аннотация: The system HoAl3(BO3)(4) has recently been found to exhibit a large magnetoelectric effect. To understand the mechanism, macroscopic and atomic level properties of HoAl3(BO3)(4) were explored by temperature and magnetic field dependent heat capacity measurements, pressure and temperature dependent x-ray diffraction measurements, as well as temperature and magnetic field dependent x-ray absorption fine structure measurements. The experimental work was complemented by density functional theory calculations. An anomalous change in the structure is found in the temperature range where large magnetoelectric effects occur. No significant structural change or distortion of the HoO6 polyhedra is seen to occur with magnetic field. However, the magnetic field dependent structural measurements reveal enhanced correlation between neighboring HoO6 polyhedra. This observed response is seen to saturate near 3 T. A qualitative atomic level description of the mechanism behind the large electric polarization induced by magnetic fields in the general class of RAl3(BO3)(4) systems (R = rare earth) is developed.

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Держатели документа:
New Jersey Inst Technol, Dept Phys, Newark, NJ 07102 USA.
SUNY Stony Brook, Inst Mineral Phys, Stony Brook, NY 11794 USA.
Brookhaven Natl Lab, Photon Sci Div, Upton, NY 11973 USA.
RAS, Siberian Branch, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Zhang, H.; Yu, T.; Chen, Z.; Nelson, C. S.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Abeykoon, A. M. M.; Tyson, T. A.
}
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10.

Magneto-optical spectra and electron structure of Nd0.5Gd0.5Fe3(BO3)4 single crystal / A. V. Malakhovskii [et al.] // J. Magn. Magn. Mater. - 2016. - Vol. 401. - P. 517-524, DOI 10.1016/j.jmmm.2015.10.074. - Cited References: 24. - The work was supported by the President of Russia Grant No. Nsh-2886.2014.2. . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES
GdFe3(BO3)4
Nd3+
Кл.слова (ненормированные):
f-f transitions -- Nd3+ ion -- Magnetic circular dichroisms -- Magnetic circulardichroism
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 and at temperatures 2-300 K. On the basis of these data, in the paramagnetic state of the crystal, the 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 were found theoretically in the |J,±MJ) wave functions approximation and were determined experimentally with the help of the measured MCD spectra. In the majority of cases the experimentally found values are close to the theoretically predicted ones. © 2015 Elsevier B.V. All rights reserved.

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Держатели документа:
L. V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russian Federation
B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkov, Ukraine

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Temerov, V. L.; Темеров, Владислав Леонидович
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