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1.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Boldyrev K. N., Stanislavchuk T. N., Klimin S. A., Popova M. N., Bezmaternykh L. N.
Заглавие
: Terahertz spectroscopy of multiferroic EuFe3(
BO3
)4
Место публикации
: Phys. Lett. A: Elsevier Science BV, 2012. - Vol. 376, Is. 37. - P.2562-2564. - ISSN 0375-9601,
DOI
10.1016/j.physleta.2012.06.028
Примечания
: 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.
Предметные рубрики:
SINGLE-CRYSTAL
GDFE3
(
BO3
)4
Ключевые слова
(''Своб.индексиров.''): 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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2.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Demidov A. A., Gudim, I. A., Eremin E. V.
Заглавие
: Magnetic Properties of Sm0.7Ho0.3Fe3(
BO3
)4
Место публикации
: J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 115, Is. 5. - P.815-828. - ISSN 1063-7761,
DOI
10.1134/S1063776112100020
Примечания
: Cited References: 31
Предметные 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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3.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ritter C., Pankrats A.I., Gudim, I. A., Vorotynov A.M.
Заглавие
: Determination of the magnetic structure of SmFe3(
BO3
)4 by neutron diffraction: comparison with other RFe3(
BO3
)4 iron borates
Место публикации
: J. Phys.: Condens. Matter: IOP Publishing Ltd, 2012. - Vol. 24, Is. 38. - Ст.386002. - ISSN 0953-8984,
DOI
10.1088/0953-8984/24/38/386002
Примечания
: Cited References: 40. - This work was supported by RFBR, grant No. 10-02-00765.
Предметные 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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4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Peschanskii A. V., Yeremenko A. V., Fomin V. I., Bezmaternykh L. N., Gudim, I. A.
Заглавие
: Raman scattering under structural and magnetic phase transitions in terbium ferroborate
Место публикации
: Low Temp. Phys.: American Institute of Physics, 2014. - Vol. 40, Is. 2. - P.171-178. - ISSN 1063-777X,
DOI
10.1063/1.4865566. - ISSN 1090-6517
Примечания
: Cited References: 24
Предметные 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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5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Sofronova S. N., Gerasimova Y. V., Vtyurin A. N., Gudim, I. A., Shestakov N. P., Ivanenko A. A.
Заглавие
: Infrared absorption spectrum of HoFe3(
BO3
)4 crystal
Коллективы
: RFBR [13-02-00825, 13-02-98041, SS-4828.2012.2]
Место публикации
: Vib. Spectrosc.: Elsevier Science, 2014. - Vol. 72. - P.20-25. - ISSN 0924-2031,
DOI
10.1016/j.vibspec.2014.02.005. - ISSN 1873-3697
Примечания
: 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.
Предметные рубрики:
MAGNETOELASTIC INTERACTIONS
IRON
GDFE3
(
BO3
)4
Ключевые слова
(''Своб.индексиров.''): 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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6.
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
: Local magnetic properties of multiferroic Nd0.5Gd0.5Fe3(
BO3
)4 in the excited states of Nd3+ ion
Коллективы
: Russian Foundation for Basic Researches [12-02-00026]; President of Russia grant [Nsh-2886.2014.2]
Место публикации
: J. Magn. Magn. Mater.: Elsevier, 2015. - Vol. 375. - P.153-163. - ISSN 0304-8853,
DOI
10.1016/j.jmmm.2014.09.077
Примечания
: 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.
Предметные рубрики:
SINGLE-CRYSTAL
NdFe3(
BO3
)4
GdFe3
(
BO3
)4
Ключевые слова
(''Своб.индексиров.''): 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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7.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Malakhovskii A. V., Sukhachev A. L., Sokolov V. V., Kutsak T. V., Bondarev V. S., Gudim, I. A.
Заглавие
: Magneto-optical activity of f–f transitions in ErFe3(
BO3
)4 and ErAl3(
BO3
)4 single crystals
Коллективы
: Russian Foundation for Basic Researches [12-02-00026], President of Russia Grant [Nsh-2886.2014.2]
Место публикации
: J. Magn. Magn. Mater.: Elsevier, 2015. - Vol. 384. - P.255-265. - ISSN 0304-8853,
DOI
10.1016/j.jmmm.2015.02.051. - ISSN 1873-4766
Примечания
: 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.
Предметные рубрики:
CIRCULAR-DICHROISM SPECTRA
GREEN UP-CONVERSION
SPECTROSCOPIC PROPERTIES
OPTICAL-PROPERTIES
LASER
Er3+
ABSORPTION
GROWTH
IONS
GdFe3
(
BO3
)4
Ключевые слова
(''Своб.индексиров.''): 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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8.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ritter C., Pankrats A. I., Demidov A. A., Velikanov D. A., Temerov V. L., Gudim, I. A.
Заглавие
: Inclined magnetic structure of iron borate PrxY1-xFe3(
BO3
)4: A neutron diffraction study and crystal-field calculations
Коллективы
: Russian Foundation for Basic Research [13-02-12442 ofi_m2]
Место публикации
: Phys. Rev. B: American Physical Society, 2015. - Vol. 91, Is. 13. - Ст.134416. - ISSN 1098,
DOI
10.1103/PhysRevB.91.134416. - ISSN 1550235X(eISSN)
Примечания
: Cited References:33. - This paper was supported by the Russian Foundation for Basic Research (Project No. 13-02-12442 ofi_m2).
Предметные 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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9.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Zhang H., Yu T., Chen Z., Nelson C. S., Bezmaternykh L. N., Abeykoon A. M. M., Tyson T. A.
Заглавие
: Probing magnetostructural correlations in multiferroic HoAl3(
BO3
)4
Место публикации
: Phys. Rev. B: American Physical Society, 2015. - Vol. 92, Is. 10. - Ст.104108. - ISSN 1098,
DOI
10.1103/PhysRevB.92.104108. - ISSN 1550235X(eISSN)
Примечания
: 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.
Предметные 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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10.
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
: Magneto-optical spectra and electron structure of Nd0.5Gd0.5Fe3(
BO3
)4 single crystal
Место публикации
: J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 401. - P.517-524. - ISSN 0304-8853,
DOI
10.1016/j.jmmm.2015.10.074
Примечания
: Cited References: 24. - The work was supported by the President of Russia Grant No. Nsh-2886.2014.2.
Предметные рубрики:
MAGNETIC-PROPERTIES
GdFe3
(
BO3
)4
Nd3+
Ключевые слова
(''Своб.индексиров.''): 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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11.
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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12.
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
: Peculiarities of magnetic properties of Nd3+ ions in the Nd0.5Gd0.5Fe3(
BO3
)4 crystal in the optically excited states 4(F7/2 + S3/2) and (4G9/2 + 2K13/2 + 4G7/2)
Место публикации
: J. Alloys Compd.: Elsevier, 2016. - Vol. 680. - P.87-94. - ISSN 09258388 (ISSN),
DOI
10.1016/j.jallcom.2016.04.088
Примечания
: Cited References: 32. - 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
Ключевые слова
(''Своб.индексиров.''): f-f transitions--nd3+ ion--excited states--local magnetic properties
Аннотация:
Polarized absorption spectra of f-f absorption bands 4I9/2 → 4(F7/2 + S3/2) and (4G9/2 + 2K13/2 + 4G7/2) 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 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) did not correlate with the theoretical Landé factor. The Landé factors of the excited states were experimentally found. The local reorientation field induced metamagnetic transitions were observed in the excited states. In some excited states the energetically favorable orientation of the Nd3+ ion magnetic moment is opposite to that in the ground state.
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13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Erofeev D. A., Chukalina E. P., Bezmaternykh L. N., Gudim I. A., Popova M. N.
Заглавие
: High-resolution spectroscopy of HoFe3(
BO3
)4 crystal: a study of phase transitions
Коллективы
: Russian Scientific Foundation [14-12-01033]
Место публикации
: Opt. Spectrosc.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 120, Is. 4. - P.558-565. - ISSN 0030-400X,
DOI
10.1134/S0030400X16040056. - ISSN 1562-6911(eISSN)
Примечания
: Cited References:30. - This work was supported by the Russian Scientific Foundation, grant no. 14-12-01033.
Предметные рубрики:
Magnetoelastic interactions
GdFE3
(
BO3
)4
Аннотация:
The transmission spectra of HoFe3(
BO3
) multiferroic single crystals are studied by optical Fourier-transform spectroscopy at temperatures of 1.7–423 K in polarized light in the spectral range 500–10 000 cm–1 with a resolution up to 0.1 cm–1. A new first-order structural phase transition close to the second-order transition is recorded at Tc = 360 K by the appearance of a new phonon mode at 976 cm–1. The reasons for considerable differences in Tc for different samples of holmium ferroborate are discussed. By temperature variations in the spectra of the f–f transitions in the Ho3+ ion, we studied two magnetic phase transitions, namely, magnetic ordering into an easy-plane structure as a second-order phase transition at TN = 39 K and spin reorientation from the ab plane to the c axis as a first-order phase transition at TSR = 4.7 ± 0.2 K. It is shown that erbium impurity in a concentration of 1 at % decreases the spin-reorientation transition temperature to TSR = 4.0 K.
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14.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Klimin S. A., Kashchenko M. A., Bezmaternykh L. N.
Заглавие
: Spin-phonon and electron-phonon interactions in multiferroic
GdFe3
(
BO3
)4 and TbFe3(
BO3
)4 evidenced by IR reflection spectroscopy
Коллективы
: Russian Science Foundation [14-12-01033]; Swiss National Science Foundation (SNSF); Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva
Место публикации
: J. Low Temp. Phys.: Springer/Plenum Publishers, 2016. - Vol. 185, Is. 5-6. - P.538-543. - ISSN 0022-2291,
DOI
10.1007/s10909-016-1597-6. - ISSN 1573-7357(eISSN)
Примечания
: Cited References:19. - The authors thank Alexey Kuzmenko and Marina Popova for fruitful discussions. This paper was supported by the Russian Science Foundation under Grant No. 14-12-01033, by the Swiss National Science Foundation (SNSF), and by the Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva.
Предметные рубрики:
PHASE-TRANSITIONS
GdFe3
(
BO3
)4
CRYSTALS
SPECTRUM
Ключевые слова
(''Своб.индексиров.''): multiferroics--ir-active phonons--spin-phonon interaction--coupled--electron-phonon mode
Аннотация:
We study temperature-dependent polarized reflection spectra of multiferroic
GdFe3
(
BO3
)4 and TbFe3(
BO3
)4 single crystals. Signatures of spin–lattice interactions in both compounds and of a formation of the electron–phonon coupled mode in TbFe3(
BO3
)4 are discussed.
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15.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Smirnova, Ekaterina S., Alekseeva O. A., Dudka, Alexander P., Artemov V. V., Zubavichus, Yan V., Gudim I. A., Bezmaternykh L. N., Frolov, Kirill V., Lyubutin, Igor S.
Заглавие
: Crystal structure, phase transition and structural deformations in iron borate (Y0.95Bi0.05)Fe3(
BO3
)4 in the temperature range 90–500 K
Коллективы
: Russian Foundation for Basic Research [17-02-00766]; Federal Agency of Scientific Organizations [007-GZ/Ch3363/26]
Место публикации
: Acta Crystallogr. B. - 2018. - Vol. 74. - P.226-238. - ISSN 2052-5206,
DOI
10.1107/S2052520618002962
Примечания
: Cited References:27. - The following funding is acknowledged: Russian Foundation for Basic Research (award No. 17-02-00766) and Federal Agency of Scientific Organizations (Agreement No 007-GZ/Ch3363/26).
Предметные рубрики:
HIGH-PRESSURES
GDFE3
(
BO3
)4
SPECTROSCOPY
IFEFFIT
Ключевые слова
(''Своб.индексиров.''): rare-earth iron borates--crystal structure--structural phase transition--structural deformations
Аннотация:
An accurate X-ray diffraction study of (Y0.95Bi0.05)Fe3(
BO3
)4 single crystals in the temperature range 90–500 K was performed on a laboratory diffractometer and used synchrotron radiation. It was established that the crystal undergoes a diffuse structural phase transition in the temperature range 350–380 K. The complexity of localization of such a transition over temperature was overcome by means of special analysis of systematic extinction reflections by symmetry. The transition temperature can be considered to be Tstr ≃ 370 K. The crystal has a trigonal structure in the space group P3121 at temperatures of 90–370 K, and it has a trigonal structure in the space group R32 at 375–500 K. There is one type of chain formed by the FeO6 octahedra along the c axis in the R32 phase. When going into the P3121 phase, two types of nonequivalent chains arise, in which Fe atoms are separated from the Y atoms by a different distance. Upon lowering the temperature from 500 to 90 K, a distortion of the Y(Bi)O6, FeO6, B(2,3)O3 coordination polyhedra is observed. The distances between atoms in helical Fe chains and Fe—O—Fe angles change non-uniformly. A sharp jump in the equivalent isotropic displacement parameters of O1 and O2 atoms within the Fe—Fe chains and fluctuations of the equivalent isotropic displacement parameters of B2 and B3 atoms were observed in the region of structural transition as well as noticeable elongation of O1, O2, B2, B3, Fe1, Fe2 atomic displacement ellipsoids. It was established that the helices of electron density formed by Fe, O1 and O2 atoms may be structural elements determining chirality, optical activity and multiferroicity of rare-earth iron borates. Compression and stretching of these helices account for the symmetry change and for the manifestation of a number of properties, whose geometry is controlled by an indirect exchange interaction between iron cations that compete with the thermal motion of atoms in the structure. Structural analysis detected these changes as variations of a number of structural characteristics in the c unit-cell direction, that is, the direction of the helices. Structural results for the local surrounding of the atoms in (Y0.95Bi0.05)Fe3(
BO3
)4 were confirmed by EXAFS and Mössbauer spectroscopies.
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16.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Pavlovskiy M. S., Zinenko V. I., Shinkorenko A. S.
Заглавие
: Effect of a rare-earth ion on the structural instability in RFe3(
BO3
)4 crystals
Коллективы
: Russian Science Foundation [17-72-10122]
Место публикации
: JETP Letters. - 2018. - Vol. 108, Is. 2. - P.116-120. - ISSN 0021-3640,
DOI
10.1134/S0021364018140114. - ISSN 1090-6487(eISSN)
Примечания
: Cited References: 17. - This work was supported by the Russian Science Foundation (project no. 17-72-10122).
Предметные рубрики:
Iron
GdFe3
(
BO3
)4
Аннотация:
The dynamics of the crystal lattice of RFe3(
BO3
)4 (R = Pr, Nd, Sm, Gd, Tb, Dy, and Ho) compounds in the high-symmetry R32 phase has been calculated. Significant changes in spectra of compounds with various rare-earth ions have been obtained only near the edge Λ point of the Brillouin zone (qΛ = 1/3(−2b1 + b2 + b3, where b1, b2, and b3 are the reciprocal lattice vectors) for acoustic oscillation branches. A decrease in the frequency of an acoustic mode at the point Λ has been revealed in all studied compounds. This frequency depends on the type of rare-earth ion and decreases from a compound with Pr to a compound with Ho down to imaginary values. Such a behavior of the frequency of the unstable acoustic mode is in good agreement with experimental data on the dependence of the temperature of the R32 → P3121 structural phase transition on the type of rare-earth ion in ferroborates.
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17.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Gudim I. A., Demidov A. A., Eremin E. V., Shukla D. K.
Заглавие
: Magnetic and magnetodielectric properties of Ho0.5Nd0.5Fe3(
BO3
)4
Коллективы
: Russian Foundation for Basic Research [17-52-45091 IND_a]
Место публикации
: Phys. Solid State. - 2018. - Vol. 60, Is. 10. - P.1989-1998. - ISSN 1063-7834,
DOI
10.1134/S1063783418100086. - ISSN 1090-6460(eISSN)
Примечания
: Cited References: 26. - This study was supported by the Russian Foundation for Basic Research, project no. 17-52-45091 IND_a.
Предметные рубрики:
SPIN REORIENTATION
SINGLE-CRYSTALS
GDFE3
(
BO3
)4
Аннотация:
The magnetic and magnetodielectric properties of Ho0.5Nd0.5Fe3(
BO3
)4 ferroborate with the competing Ho–Fe and Nd–Fe exchange couplings have been experimentally and theoretically investigated. Step anomalies in the magnetization curves at the spin-reorientation transition induced by the magnetic field B ║ c have been found. The spontaneous spin-reorientation transition temperature TSR ≈ 8 K has been refined. The measured magnetic properties and observed features are interpreted using a single theoretical approach based on the molecular field approximation and calculations within the crystal field model of the rare-earth ion. Interpretation of the experimental data includes determination of the crystal field parameters for Ho3+ and Nd3+ ions in Ho0.5Nd0.5Fe3(
BO3
)4 and parameters of the Ho–Fe and Nd–Fe exchange couplings.
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