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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) / A. V. Malakhovskii [et al.] // J. Alloys Compd. - 2016. - Vol. 680. - P. 87-94, DOI 10.1016/j.jallcom.2016.04.088. - 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. . - ISSN 0925-8388

РУБ Chemistry, Physical + Materials Science + Metallurgy & Metallurgical Engineering
Рубрики:
Single-crystal
GdFe3(BO3)4
Кл.слова (ненормированные):
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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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.; Temerov, V. L.; Темеров, Владислав Леонидович
}
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High-resolution spectroscopy of HoFe3(BO3)4 crystal: a study of phase transitions / D. A. Erofeev [et al.] // Opt. Spectrosc. - 2016. - Vol. 120, Is. 4. - P. 558-565, DOI 10.1134/S0030400X16040056. - Cited References:30. - This work was supported by the Russian Scientific Foundation, grant no. 14-12-01033. . - ISSN 0030-400X. - ISSN 1562-6911

РУБ Optics + Spectroscopy
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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Публикация на русском языке Спектроскопия высокого разрешения кристалла HoFe3(BO3)4: исследование фазовых переходов [Текст] / Д. А. Ерофеев [и др.] // Оптика и спектроскопия : Наука, 2016. - Т. 120 № 4. - С. 588-595

Держатели документа:
Russian Acad Sci, Inst Spect, Moscow 108840, Russia.
State Univ, Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Oblast, Russia.
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Erofeev, D. A.; Chukalina, E. P.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Popova, M. N.; Russian Scientific Foundation [14-12-01033]
}
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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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    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 / A. V. Malakhovskii [et al.] // Opt. Mater. - 2016. - Vol. 52. - P. 126-133, DOI 10.1016/j.optmat.2015.12.029. - 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. . - ISSN 0925-3467. - ISSN 1873-1252
   Перевод заглавия: Изменения локальных магнитных свойств оптически возбужденных ионов Nd3+ и их проявление в ближних ИК-спектрах кристалла Nd0.5Gd0.5Fe3(BO3)4

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
SINGLE-CRYSTAL
GdFe3(BO3)4
STATES
Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, 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.; Temerov, V. L.; Темеров, Владислав Леонидович; Russian Foundation [16-02-00273]; [Nsh-2886.2014.2]
}
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    Pavlovskiy, M. S.
    Effect of a rare-earth ion on the structural instability in RFe3(BO3)4 crystals / M. S. Pavlovskiy, V. I. Zinenko, A. S. Shinkorenko // JETP Letters. - 2018. - Vol. 108, Is. 2. - P. 116-120, DOI 10.1134/S0021364018140114. - Cited References: 17. - This work was supported by the Russian Science Foundation (project no. 17-72-10122). . - ISSN 0021-3640. - ISSN 1090-6487
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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Публикация на русском языке Павловский, Максим Сергеевич. Влияние редкоземельного иона на структурную неустойчивость в кристаллах RFe3(BO3)4 [Текст] / М. С. Павловский, В. И. Зиненко, А. С. Шинкоренко // Письма в ЖЭТФ. - 2018. - Т. 108 Вып. 2. - С. 103–107

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

Доп.точки доступа:
Zinenko, V. I.; Зиненко, Виктор Иванович; Shinkorenko, A. S.; Шинкоренко, Алексей Сергеевич; Павловский, Максим Сергеевич; Russian Science Foundation [17-72-10122]
}
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Magnetic and magnetodielectric properties of Ho0.5Nd0.5Fe3(BO3)4 / I. A. Gudim [et al.] // Phys. Solid State. - 2018. - Vol. 60, Is. 10. - P. 1989-1998, DOI 10.1134/S1063783418100086. - Cited References: 26. - This study was supported by the Russian Foundation for Basic Research, project no. 17-52-45091 IND_a. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
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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Публикация на русском языке Магнитные и магнитодиэлектрические свойства Ho0.5Nd0.5Fe3(BO3)4 [Текст] / И. А. Гудим [и др.] // Физ. тверд. тела. - 2018. - Т. 60 Вып. 10. - С. 1947–1956

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Bryansk State Tech Univ, Bryansk 241035, Russia.
Siberian State Univ Sci & Technol, Krasnoyarsk 660014, Russia.
UGC DAE Consortium Sci Res, Indore 452017, Madhya Pradesh, India.

Доп.точки доступа:
Gudim, I. A.; Гудим, Ирина Анатольевна; Demidov, A. A.; Eremin, E. V.; Еремин, Евгений Владимирович; Shukla, D. K.; Russian Foundation for Basic Research [17-52-45091 IND_a]
}
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Klimin, S. A.
Spin-phonon and electron-phonon interactions in multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 evidenced by IR reflection spectroscopy / S. A. Klimin, M. A. Kashchenko, L. N. Bezmaternykh // J. Low Temp. Phys. - 2016. - Vol. 185, Is. 5-6. - P. 538-543, DOI 10.1007/s10909-016-1597-6. - 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. . - ISSN 0022-2291. - ISSN 1573-7357

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   GdFe3(BO3)4
   CRYSTALS
   SPECTRUM
Кл.слова (ненормированные):
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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Держатели документа:
Inst Spect RAS, Moscow 108840, Russia.
Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia.
RAS, Siberian Branch, Kirenskiy Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kashchenko, M. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Russian Science Foundation [14-12-01033]; Swiss National Science Foundation (SNSF); Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva
}
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Crystal structure, phase transition and structural deformations in iron borate (Y0.95Bi0.05)Fe3(BO3)4 in the temperature range 90–500 K / E. S. Smirnova [et al.] // Acta Crystallogr. B. - 2018. - Vol. 74. - P. 226-238, DOI 10.1107/S2052520618002962. - 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). . - ISSN 2052-5206

РУБ Chemistry, Multidisciplinary + Crystallography
Рубрики:
HIGH-PRESSURES
   GDFE3(BO3)4
   SPECTROSCOPY
   IFEFFIT
Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, Fed Sci Res Ctr Crystallog & Photon, Shubnikov Inst Crystallog, Moscow 119333, Russia.
Natl Res Ctr, Kurchatov Inst, Moscow 123182, Russia.
Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Smirnova, Ekaterina S.; Alekseeva, Olga A.; Dudka, Alexander P.; Artemov, V. V.; Zubavichus, Yan V.; Gudim, I. A.; Гудим, Ирина Анатольевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Frolov, Kirill V.; Lyubutin, Igor S.; Russian Foundation for Basic Research [17-02-00766]; Federal Agency of Scientific Organizations [007-GZ/Ch3363/26]
}
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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.

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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