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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Platunov M. S., Ivanova N. B., Knyazev Yu. V., Bezmaternykh L. N., Eremin E. V., Vasil'ev A. D., Bayukov O. A., Ovchinnikov S. G., Velikanov D. A., Zubavichus Y. V.
Заглавие : Crystal structure and magnetization of a Co3B2O6 single crystal
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2013. - Vol. 117, Is. 1. - P.94-107. - ISSN 1063-7761, DOI 10.1134/S1063776113060186
Примечания : Cited References: 43. - The synchrotron measurements were performed at the Kurchatov Center of Synchrotron Radiation and Nanotechnologies (state contract no. 16.552.11.7055).This work was supported by the Russian Foundation for Basic Research (project nos. 12-02-00175-a, 12-02-90410-Ukr_a, 12-02-31543mol_a, 13-02-00958-a), the President of the Russian Federation (grant no. NSh-1044.2012.2), the Siberian Branch of the Russian Academy of Sciences (project no. 38), the Ministry of Education and Science of the Russian Federation (project no. 8365), and an integration project of SO RAN-NAN of Belarus (project no. 29).
Предметные рубрики: ABSORPTION FINE-STRUCTURE
NICKEL ORTHOBORATE
RAY
GDFE3(BO3)(4)
LUDWIGITE
NI3(BO3)2
NI3B2O6
SPECTRA
Аннотация: The crystal structure and magnetic properties of Co3B2O6 single crystals are studied. Orthorhombic symmetry with space group Pnnm is detected at room temperature. The measurements of static magnetization and dynamic magnetic susceptibility reveal two magnetic anomalies at T (1) = 33 K and T (2) = 10 K and an easy-axis magnetic anisotropy. The effective magnetic moment indicates a high-spin state of the Co2+ ion. A spin-flop transition is found at low temperatures and H (sf) = 23 kOe. EXAFS spectra of the K-edge absorption of Co are recorded at various temperatures, the temperature-induced changes in the parameters of the local environment of cobalt are analyzed, and the effective Co-Co and Co-O distances are determined. The magnetic interactions in the crystal are analyzed in terms of an indirect coupling model.
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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., Gudim, I. A.
Заглавие : Optical and magneto-optical properties of Nd0.5Gd0.5Fe3(BO3)4 single crystal in the near IR spectral region
Место публикации : J. Alloys Compd.: Elsevier, 2012. - Vol. 542. - P.157-163. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2012.07.061
Примечания : Cited References: 23. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by the Russian President Grant SS-1044.2012.2.
Предметные рубрики: MAGNETIC CIRCULAR-DICHROISM
GDFE3(BO3)(4)
YB3+
ER3+
ND3+
Ключевые слова (''Своб.индексиров.''): rare earth compounds--nd3+--antiferromagnets--multiferroics--magnetic circular dichroism--absorption spectra
Аннотация: Polarized optical absorption and magnetic circular dichroism (MCD) spectra of the trigonal multiferroic Nd0.5Gd0.5Fe3(BO3)4 were studied in the region of transitions 4I9/2 → 4F3/2 and 4I9/2 → (4F5/2 + 2H9/2) in Nd3+ ion. Components of the crystal field splitting of the states were identified with the help of MCD and polarized absorption spectra. Splitting of the Nd3+ absorption lines caused by the magnetic ordering were observed. Splitting of Nd3+ ground state in Fe-sublattice exchange field was found to be ∼9 cm−1 at 5.7 K. The Zeeman splitting of some absorption lines in the external magnetic field and changes of the effective Landé factors in the C3-direction as a result of the corresponding optical transitions were found. Peculiarities in the temperature behavior of the absorption lines connected both with the ground and excited states were revealed. Peculiarities connected with the excited states testify to the local crystal distortions in the excited states.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Eremin E. V., Velikanov D. A., Kartashev A. V., Vasil'ev A. D., Gudim I. A.
Заглавие : Magnetic properties of the Nd0.5Gd0.5Fe3(BO3)(4) single crystal
Разночтения заглавия :авие SCOPUS: Magnetic properties of the Nd 0.5Gd 0.5Fe 3(BO 3) 4 single crystal
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 10. - P2032-2037. - ISSN 1063-7834, DOI 10.1134/S1063783411100180
Примечания : Cited References: 19. - This study was supported by the Russian Foundation for Basic Research, project no. 09-02-00171-a.
Предметные рубрики: GDFE3(BO3)(4)
NDFE3(BO3)(4)
Аннотация: The magnetic properties of the Nd0.5Gd0.5Fe3(BO3)(4) single crystal have been studied in principal crystallographic directions in magnetic fields to 90 kG in the temperature range 2-300 K; in addition, the heat capacity has been measured in the range 2-300 K. It has been found that, below the N,el temperature T (N) = 32 K down to 2 K, the single crystal exhibits an easy-plane antiferromagnetic structure. A hysteresis has been detected during magnetization of the crystal in the easy plane in fields of 1.0-3.5 kG, and a singularity has been found in the temperature dependence of the magnetic susceptibility in the easy plane at a temperature of 11 K in fields B 1 kG. It has been shown that the singularity is due to appearance of the hysteresis. The origin of the magnetic properties of the crystal near the hysteresis has been discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'menko A. M., Mukhin A. A., Ivanov V. Y., Kadomtseva A. M., Bezmaternykh L. N.
Заглавие : Effects of the Interaction between R and Fe Modes of the Magnetic Resonance in RFe3(BO3)(4) Rare-Earth Iron Borates
Разночтения заглавия :авие SCOPUS: Effects of the interaction between R and Fe modes of the magnetic resonance in RFe 3(BO 3) 4 rare-earth iron borates
Место публикации : JETP Letters. - 2011. - Vol. 94, Is. 4. - P.294-300. - ISSN 0021-3640, DOI 10.1134/S0021364011160119
Примечания : Cited References: 27. - We are grateful to A. S. Prokhorov for discussion of this work and valuable comments. This work was supported by the Russian Foundation for Basic Research, project nos. 10-02-00846 and 09-02-01355, and the Ministry of Education and Science of the Russian Federation, project no. 16.518.11.7034.
Предметные рубрики: MULTIFERROICS
GDFE3(BO3)(4)
FERROELECTRICITY
Аннотация: Resonance modes that are due to magnetic excitations in the exchange-coupled subsystems of rare-earth ions (R = Nd3+, Sm3+, and Gd3+) and Fe3+ ions have been detected in submillimeter transmission spectra (0.1-0.6 THz) of RFe3(BO3)(4) iron borate-multiferroic single crystals. The strong interaction between spin oscillations of the Fe and R subsystems has been revealed, which determines the behavior of the modes depending on the anisotropy of the exchange splitting of the ground doublet of the R ion. It has been shown that the intensities of coupled modes (contributions to the magnetic permeability) depend strongly on the difference between the g factors of Fe and R ions. This dependence makes it possible to determine the sign of the latter g factor. In particular, a noticeable intensity of exchange Nd modes in NdFe3(BO3)(4) is due to an increase in their contribution at g(perpendicular to,parallel to)(Nd) 0, while in GdFe3(BO3)(4) with g(Gd) approximate to g(Fe) approximate to 2, the Fe and Gd contributions compensate each other and the exchange (Gd) mode is not observed. In spite of the weak interaction of Sm ions with the magnetic field, SmFe3(BO3)(4) exhibits resonance modes, which are attributed to the excitation of Sm ions through the Fe subsystem. DOI: 10.1134/S0021364011160119
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'menko A. M., Mukhin A. A., Ivanov V. Y., Kadomtseva A. M., Lebedev S. P., Bezmaternykh L. N.
Заглавие : Antiferromagnetic Resonance and Dielectric Properties of Rare-earth Ferroborates in the Submillimeter Frequency Range
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 1. - P113-120. - ISSN 1063-7761, DOI 10.1134/S106377611105013X
Примечания : Cited References: 27. - This work was supported by the Russian Foundation for Basic Research, project no. 10-02-00846.
Предметные рубрики: GDFE3(BO3)(4)
SPECTROSCOPY
CRYSTAL
Ключевые слова (''Своб.индексиров.''): antiferromagnetic resonance--basic parameters--effective anisotropy constant--ferroborates--ferroics--ferromagnetic orderings--frequency ranges--magnetic interactions--magnetoresonance--millimeter frequency range--rare earth ions--submillimeters--antiferromagnetic materials--crystallography--erbium--europium--ferromagnetic resonance--ion exchange--magnetic anisotropy--magnetic devices--magnetic structure--permittivity--resonance--antiferromagnetism
Аннотация: The magnetoresonance and dielectric properties of a number of crystals of a new family of multiferroics, namely, rare-earth ferroborates RFe(3)(BO(3))(4) (R = Y, Eu, Pr, Tb, Tb(0.25)Er(0.75)), are studied in the submillimeter frequency range (nu = 3-20 cm(-1)). Ferroborates with R = Y, Tb, and Eu exhibit permittivity jumps at temperatures of 375, 198, and 58 K, respectively, which are caused by the R32 - P3(1)2(1) phase transition. Antiferromagnetic resonance (AFMR) modes in the subsystem of Fe(3+) ions are detected in the range of antiferromagnetic ordering (T T(N)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liang K. C., Chaudhury R. P., Lorenz B., Sun Y. Y., Bezmaternykh L. N., Temerov V. L., Chu C. W.
Заглавие : Giant magnetoelectric effect in HoAl3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Giant magnetoelectric effect in HoAl 3(BO 3) 4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2011. - Vol. 83, Is. 18. - Ст.180417. - ISSN 1098-0121, DOI 10.1103/PhysRevB.83.180417
Примечания : Cited References: 29. - This work was supported by the DOE, the AFOSR, the T.L.L. Temple Foundation, the J.J. and R. Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston.
Предметные рубрики: ELECTRIC POLARIZATION
SINGLE-CRYSTALS
MULTIFERROICS
FERROELECTRICITY
GDFE3(BO3)(4)
TEMPERATURE
TBPO4
Аннотация: A giant magnetoelectric polarization is found in HoAl3(BO3)(4). The polarization in transverse field geometry at 70 kOe reaches 3600 mu C/m(2), which is significantly higher than reported values of linear magnetoelectric or even multiferroic compounds. The magnetostrictive effect is also measured and compared with the magnetoelectricity. The results show that spin-lattice coupling in HoAl3(BO3)(4) is extremely strong and that the magnetic field causes a large polar distortion of the ionic positions in the unit cell.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rebbouh L., Desautels R. D., Ritter C., Cadogan J. M., Temerov V., Pankrats A. I., van Lierop J.
Заглавие : Short-range correlations and their thermal hysteresis in the paramagnetic phase of YFe3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Short-range correlations and their thermal hysteresis in the paramagnetic phase of YFe3(BO3)4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2011. - Vol. 83, Is. 14. - Ст.140406. - ISSN 1098-0121, DOI 10.1103/PhysRevB.83.140406
Примечания : Cited References: 21. - This work was supported by grants from the Natural Sciences and Engineering Research Council of Canada and the Canada Foundation for Innovation. J.M.C. acknowledges support from the Canada Research Chairs program.
Предметные рубрики: MOSSBAUER-SPECTRA
GDFE3(BO3)(4)
RELAXATION
Аннотация: Neutron diffraction and Mossbauer spectroscopy have been used to examine the connections between long-and short-range magnetic order in the rare-earth iron ferroborate YFe3(BO3)(4). We establish the presence of short-range magnetic order in the pseudo-one-dimensional Fe-spin chains of the FeO6 octahedra while the ferroborates are in their (long-range) paramagnetic phase. The short-range order exists at temperatures several times the Neel temperature. In addition, we observe thermal hysteresis of the short-range ordered Fe spins. The observed Fe-spin dynamics are suggestive of the presence of solitons within the domains that form in the Fe-spin chains.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dyakonov V. P., Szymczak R., Prokhorov A. D., Zubov E., Prokhorov A. A., Petrakovskii G. A., Bezmaternykh L. N., Berkowski M., Varyukhin V., Szymczak H.
Заглавие : Magnetic and EPR studies of the EuFe3(BO3)(4) single crystal
Коллективы :
Разночтения заглавия :авие SCOPUS: Magnetic and EPR studies of the EuFe 3(BO 3) 4 single crystal
Место публикации : Eur. Phys. J. B: SPRINGER, 2010. - Vol. 78, Is. 3. - P291-298. - ISSN 1434-6028, DOI 10.1140/epjb/e2010-10059-3
Примечания : Cited References: 23. - A.A. Prokhorov is grateful to Mianowski Fund for financial support.
Предметные рубрики: EARTH
GDFE3(BO3)(4)
MULTIFERROICS
Ключевые слова (''Своб.индексиров.''): absorption lines--antiferromagnetic orderings--applied magnetic fields--basal planes--easy direction of magnetizations--electron paramagnetic resonance--epr measurements--epr spectra--epr studies--europium ions--exchange fields--g factors--lorentz--magnetic measurements--magnetic subsystems--orientation dependence--sub-lattices--temperature dependence--temperature range--trigonal symmetry--zeeman effect--antiferromagnetism--crystal orientation--europium--magnetic fields--magnetic moments--magnetic variables measurement--magnetization--paramagnetic resonance--paramagnetism--single crystals--spectroscopy--electron spin resonance spectroscopy
Аннотация: Magnetic and electron paramagnetic resonance (EPR) properties of EuFe3(BO3)(4) single crystals have been studied over the temperature range of 300-4.2 K and in a magnetic field up to 5 T. The temperature, field and orientation dependences of susceptibility, magnetization and EPR spectra are presented. An antiferromagnetic ordering of the Fe subsystem occurs at about 37 K. The easy direction of magnetization perpendicular to the c axis is determined by magnetic measurements. Below 10 K, we observe an increase of susceptibility connected with the polarization of the Eu sublattice by an effective exchange field of the ordered Fe magnetic subsystem. In a magnetic field perpendicular to the c axis, we have observed an increase of magnetization at T 10 K in the applied magnetic field, which can be attributed to the appearance of the magnetic moment induced by the magnetic field applied in the basal plane. According to EPR measurements, the distance between the maximum and minimum of derivative of absorption line of the Lorentz type is equal to 319 Gs. The anisotropy of g-factor and linewidth is due to the influence of crystalline field of trigonal symmetry. The peculiarities of temperature dependence of both intensity and linewidth are caused by the influence of excited states of europium ion (Eu3+). It is supposed that the difference between the g-factors from EPR and the magnetic measurements is caused by exchange interaction between rare earth and Fe subsystems via anomalous Zeeman effect.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hamann-Borrero J. E., Philipp M., Kataeva O., Zimmermann M. V., Geck J., Klingeler R., Vasiliev A., Bezmaternykh L. N., Buchner B., Hess C.
Заглавие : Nonresonant x-ray magnetic scattering on rare-earth iron borates RFe3(BO3)(4)
Коллективы :
Разночтения заглавия :авие SCOPUS: Nonresonant x-ray magnetic scattering on rare-earth iron borates R Fe 3(BO3)4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2010. - Vol. 82, Is. 9. - Ст.94411. - ISSN 1098-0121, DOI 10.1103/PhysRevB.82.094411
Примечания : Cited References: 38. - This work was supported by the Deustche Forschungsgemeinschaft, through the Forschergruppe FOR520 (Grant No. HE3439/6) and HASYLAB at the Feyerherm from HMI Berlin and specially to Jorg Strempfer from HASYLAB at DESY in Hamburg for valuable discussions.
Предметные рубрики: SINGLE-CRYSTALS
CROSS-SECTION
GDFE3(BO3)(4)
NDFE3(BO3)(4)
DIFFRACTION
MNF2
Аннотация: Hard x-ray scattering experiments with a photon energy of 100 keV were performed as a function of temperature and applied magnetic field on selected compounds of the RFe3(BO3)4 family. The results show the presence of several diffraction features, in particular, nonresonant magnetic reflections in the magnetically ordered phase and structural reflections that violate the diffraction conditions for the low-temperature phase P3(1)21 of the rare-earth iron borates. The temperature and field dependence of the magnetic superlattice reflections corroborate the magnetic structures of the borate compounds obtained by neutron diffraction. The detailed analysis of the intensity and scattering cross section of the magnetic reflection reveals details of the magnetic structure of these materials such as the spin domain structure of NdFe3(BO3)(4) and GdFe3(BO3)(4). Furthermore we find that the correlation length of the magnetic domains is around 100 angstrom for all the compounds and that the Fe moments are rotated 53 degrees +/- 3 degrees off from the hexagonal basal plane in GdFe3(BO3)(4).
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Adem U., Wang L., Fausti D., Schottenhamel W., van Loosdrecht PHM, Vasiliev A., Bezmaternykh L. N., Buchner B., Hess C., Klingeler R.
Заглавие : Magnetodielectric and magnetoelastic coupling in TbFe3(BO3)(4)
Коллективы :
Разночтения заглавия :авие SCOPUS: Magnetodielectric and magnetoelastic coupling in TbFe3(BO 3)4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2010. - Vol. 82, Is. 6. - Ст.64406. - ISSN 1098-0121, DOI 10.1103/PhysRevB.82.064406
Примечания : Cited References: 23. - We thank K. L. and S. G. for technical support. Work was supported by the DFG through Grants No. HE 3439/6 and No. 486 RUS 113/982/0-1.
Предметные рубрики: DIELECTRIC-CONSTANTS
IRON
GDFE3(BO3)(4)
MULTIFERROICS
TEMPERATURE
Аннотация: We have studied the magnetodielectric and magnetoelastic coupling in TbFe3(BO3)(4) single crystals by means of capacitance, magnetostriction, and Raman spectroscopy measurements. The data reveal strong magnetic field effects on the dielectric constant and on the macroscopic sample length which are associated to long-range magnetic ordering and a field-driven metamagnetic transition. We discuss the coupling of the dielectric, structural, and magnetic order parameters and attribute the origin of the magnetodielectric coupling to phonon mode shifts according to the Lyddane-Sachs-Teller relation.
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