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Crystal structure and magnetization of a Co3B2O6 single crystal / N. V. Kazak [et al.] // J. Exp. Theor. Phys. - 2013. - Vol. 117, Is. 1. - P. 94-107, DOI 10.1134/S1063776113060186. - 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). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
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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Публикация на русском языке Особенности кристаллической структуры и намагниченности монокристалла Co3 B2 O6 [Текст] / Н. В. Казак [и др.] // Журн. эксперим. и теор. физ. - 2013. - Т. 144 Вып. 1.- P.109-125

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Aerosp Univ, Kransoyarsk 660014, Russia
Kurchatov Inst, Russian Res Ctr, Moscow 123182, Russia

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Ivanova, N. B.; Иванова, Наталья Борисовна; Knyazev, Yu. V.; Князев, Юрий Владимирович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Eremin, E. V.; Еремин, Евгений Владимирович; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Zubavichus, Y. V.
}
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Optical and magneto-optical properties of Nd0.5Gd0.5Fe3(BO3)4 single crystal in the near IR spectral region / A. V. Malakhovskii [et al.] // J. Alloys Compd. - 2012. - Vol. 542. - P. 157-163, DOI 10.1016/j.jallcom.2012.07.061. - 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. . - ISSN 0925-8388

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
MAGNETIC CIRCULAR-DICHROISM
   GDFE3(BO3)(4)
   YB3+
   ER3+
   ND3+
Кл.слова (ненормированные):
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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Держатели документа:
[Malakhovskii, A. V.
Sukhachev, A. L.
Gudim, I. A.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Gnatchenko, S. L.
Kachur, I. S.
Piryatinskaya, V. G.] 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; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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Magnetic properties of the Nd0.5Gd0.5Fe3(BO3)(4) single crystal / A. V. Malakhovskii [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 10. - P. 2032-2037, DOI 10.1134/S1063783411100180. - Cited References: 19. - This study was supported by the Russian Foundation for Basic Research, project no. 09-02-00171-a. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Держатели документа:
[Malakhovskii, A. V.
Eremin, E. V.
Velikanov, D. A.
Kartashev, A. V.
Vasil'ev, A. D.
Gudim, I. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Velikanov, D. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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    Effects of the Interaction between R and Fe Modes of the Magnetic Resonance in RFe3(BO3)(4) Rare-Earth Iron Borates / A. M. Kuz'menko [et al.] // JETP Letters. - 2011. - Vol. 94, Is. 4. - P. 294-300, DOI 10.1134/S0021364011160119. - 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. . - ISSN 0021-3640
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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Публикация на русском языке Эффекты взаимодействия R- и Fe-мод магнитного резонанса в редкоземельных ферроборатах RFe3(BO3) 4 [Текст] / А. М. Кузьменко [и др.] // Письма в "Журн. эксперим. и теор. физ.". - 2011. - Т. 94 Вып. 3-4. - С. 318-324

Держатели документа:
[Kuz'menko, A. M.
Mukhin, A. A.
Ivanov, V. Yu.] Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow 119991, Russia
[Kadomtseva, A. M.] Moscow MV Lomonosov State Univ, Moscow 119992, Russia
[Bezmaternykh, L. N.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow 119991, Russian Federation
Moscow State University, Moscow 119992, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Kuz'menko, A. M.; Mukhin, A. A.; Ivanov, V. Y.; Kadomtseva, A. M.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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Antiferromagnetic Resonance and Dielectric Properties of Rare-earth Ferroborates in the Submillimeter Frequency Range / A. M. Kuz'menko [et al.] // J. Exp. Theor. Phys. - 2011. - Vol. 113, Is. 1. - P. 113-120, DOI 10.1134/S106377611105013X. - Cited References: 27. - This work was supported by the Russian Foundation for Basic Research, project no. 10-02-00846. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GDFE3(BO3)(4)
SPECTROSCOPY
CRYSTAL
Кл.слова (ненормированные):
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) = 30-40 K) in all ferroborates that have either an easy-plane (Y, Eu) or easy-axis (Pr, Tb, Tb(0.25)Er(0.75)) magnetic structure. The AFMR frequencies are found to depend strongly on the magnetic anisotropy of a rare-earth ion and its exchange interaction with the Fe subsystem, which determine the type of magnetic structure and the sign and magnitude of an effective anisotropy constant. The basic parameters of the magnetic interactions in these ferroborates are found, and the magnetoelectric contribution to AFMR is analyzed.

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Держатели документа:
[Kuz'menko, A. M.
Mukhin, A. A.
Ivanov, V. Yu.
Lebedev, S. P.] Russian Acad Sci, Inst Gen Phys, Moscow 119991, Russia
[Kadomtseva, A. M.] Moscow MV Lomonosov State Univ, Moscow 119991, Russia
[Bezmaternykh, L. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of General Physics, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russian Federation
Moscow State University, Moscow, 119991, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Kuz'menko, A. M.; Mukhin, A. A.; Ivanov, V. Y.; Kadomtseva, A. M.; Lebedev, S. P.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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Giant magnetoelectric effect in HoAl3(BO3)(4) / K. C. Liang [et al.] // Phys. Rev. B. - 2011. - Vol. 83, Is. 18. - Ст. 180417, DOI 10.1103/PhysRevB.83.180417. - 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. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
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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Держатели документа:
[Liang, K. -C.
Chaudhury, R. P.
Lorenz, B.
Sun, Y. Y.
Chu, C. W.] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA
[Liang, K. -C.
Chaudhury, R. P.
Lorenz, B.
Sun, Y. Y.
Chu, C. W.] Univ Houston, Dept Phys, Houston, TX 77204 USA
[Bezmaternykh, L. N.
Temerov, V. L.] Russian Acad Sci, Siberian Div, Inst Phys, Krasnoyarsk 660036, Russia
[Chu, C. W.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
ИФ СО РАН
Texas Center for Superconductivity, University of Houston and Department of Physics, University of Houston, Houston, TX 77204-5002, United States
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, United States

Доп.точки доступа:
Liang, K. C.; Chaudhury, R. P.; Lorenz, B.; Sun, Y. Y.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович; Chu, C. W.
}
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Short-range correlations and their thermal hysteresis in the paramagnetic phase of YFe3(BO3)(4) / L. . Rebbouh [et al.] // Phys. Rev. B. - 2011. - Vol. 83, Is. 14. - Ст. 140406, DOI 10.1103/PhysRevB.83.140406. - 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. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
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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Держатели документа:
[Rebbouh, L.
Desautels, R. D.
Cadogan, J. M.
van Lierop, J.] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada
[Ritter, C.] Inst Laue Langevin, F-38042 Grenoble, France
[Temerov, V.
Pankrats, A.] RAS, LV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
Institut Laue-Langevin, Boite Postale 156, F-38042 Grenoble, France
L. V. Kirenskii Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Rebbouh, L.; Desautels, R. D.; Ritter, C.; Cadogan, J. M.; Temerov, V.; Pankrats, A. I.; Панкрац, Анатолий Иванович; van Lierop, J.
}
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Magnetic and EPR studies of the EuFe3(BO3)(4) single crystal / V. P. Dyakonov [et al.] // Eur. Phys. J. B. - 2010. - Vol. 78, Is. 3. - P. 291-298, DOI 10.1140/epjb/e2010-10059-3. - Cited References: 23. - A.A. Prokhorov is grateful to Mianowski Fund for financial support. . - ISSN 1434-6028

РУБ Physics, Condensed Matter
Рубрики:
EARTH
GDFE3(BO3)(4)
MULTIFERROICS
Кл.слова (ненормированные):
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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Держатели документа:
[Dyakonov, V. P.
Szymczak, R.
Berkowski, M.
Szymczak, H.] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[Dyakonov, V. P.
Prokhorov, A. D.
Zubov, E.
Prokhorov, A. A.
Varyukhin, V.] NANU, AA Galkin Donetsk Physicotech Inst, UA-83114 Donetsk, Ukraine
[Petrakovskii, G.
Bezmaternikh, L.] RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Physics, PAS, Al. Lotnikyw 32/46, Warsaw 02-668, Poland
A.A. Galkin Donetsk Physico-Technical Institute, NANU, R. Luxembourg str. 72, Donetsk 83114, Ukraine
L.V. Kirenski Institute of Physics, SB of RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Dyakonov, V. P.; Szymczak, R.; Prokhorov, A. D.; Zubov, E.; Prokhorov, A. A.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Berkowski, M.; Varyukhin, V.; Szymczak, H.
}
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Nonresonant x-ray magnetic scattering on rare-earth iron borates RFe3(BO3)(4) / J. E. Hamann-Borrero [et al.] // Phys. Rev. B. - 2010. - Vol. 82, Is. 9. - Ст. 94411, DOI 10.1103/PhysRevB.82.094411. - 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. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
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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Держатели документа:
[Hamann-Borrero, J. E.
Philipp, M.
Kataeva, O.
Geck, J.
Klingeler, R.
Buechner, B.
Hess, C.] IFW Dresden, Leibniz Inst Solid State & Mat Res, D-01171 Dresden, Germany
[Kataeva, O.] Russian Acad Sci, AE Arbuzov Organ & Phys Chem Inst, Kazan 420088, Russia
[Zimmermann, M. V.] Deutsch Elektronen Synchrotron DESY, Hamburger Synchrotronstrahlungslabor HASYLAB, D-22603 Hamburg, Germany
[Klingeler, R.] Univ Heidelberg, Kirchhoff Inst Phys, D-69120 Heidelberg, Germany
[Vasiliev, A.] Moscow MV Lomonosov State Univ, Fac Phys, Low Temp Phys Dept, Moscow 119992, Russia
[Bezmaternykh, L.] Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01171 Dresden, Germany
A. E. Arbuzov Institute of Organic and Physical Chemistry, Russian Academy of Sciences, Arbuzov Str. 8, Kazan 420088, Russian Federation
Hamburger Synchrotronstrahlungslabor (HASYLAB), Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22603 Hamburg, Germany
Kirchhoff Institute for Physics, University of Heidelberg, Im Neuenheimer Feld 227, D-69120 Heidelberg, Germany
Low Temperature Physics Department, Faculty of Physics, Moscow State University, Moscow 119992, Russian Federation
L. V. Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660,0,36, Russian Federation

Доп.точки доступа:
Hamann-Borrero, J. E.; Philipp, M.; Kataeva, O.; Zimmermann, M. V.; Geck, J.; Klingeler, R.; Vasiliev, A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Buchner, B.; Hess, C.
}
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10.

Magnetodielectric and magnetoelastic coupling in TbFe3(BO3)(4) / U. . Adem [et al.] // Phys. Rev. B. - 2010. - Vol. 82, Is. 6. - Ст. 64406, DOI 10.1103/PhysRevB.82.064406. - 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. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
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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Держатели документа:
[Adem, U.
Wang, L.
Schottenhamel, W.
Buechner, B.
Hess, C.
Klingeler, R.] IFW Dresden, Leibniz Inst Solid State & Mat Res, Dresden, Germany
[Fausti, D.] Univ Hamburg, CFEL, Max Planck Grp Struct Dynam, Hamburg, Germany
[van Loosdrecht, P. H. M.] Univ Groningen, Zernike Inst Adv Mat, NL-9747 AG Groningen, Netherlands
[Vasiliev, A.] Moscow MV Lomonosov State Univ, Moscow 119992, Russia
[Bezmaternykh, L. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
[Klingeler, R.] Univ Heidelberg, Kirchhoff Inst Phys, Heidelberg, Germany
ИФ СО РАН
Leibniz Institute for Solid State and Materials Research, IFW Dresden, Dresden, Germany
Max Planck Group for Structural Dynamics, University of Hamburg-CFEL, Hamburg, Germany
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands
Moscow State University, Moscow 119992, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Kirchhoff Institute for Physics, University of Heidelberg, Heidelberg, Germany

Доп.точки доступа:
Adem, U.; Wang, L.; Fausti, D.; Schottenhamel, W.; van Loosdrecht, PHM; Vasiliev, A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Buchner, B.; Hess, C.; Klingeler, R.
}
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11.

Peculiarities in the magnetic, magnetoelectric, and magnetoelastic properties of SmFe3(BO3)(4) multiferroic / Y. F. Popov [et al.] // J. Exp. Theor. Phys. - 2010. - Vol. 111, Is. 2. - P. 199-203, DOI 10.1134/S1063776110080066. - Cited References: 14. - This study was supported in part by the Russian Foundation for Basic Research (project no. 10-02-00846-a). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GDFE3(BO3)(4)
Кл.слова (ненормированные):
External magnetic field -- Field dependence -- Field directions -- G factors -- Induced polarization -- Iron borate -- Magnetoelastic properties -- Multiferroics -- Samarium-ion -- Samarium-iron -- Temperature dependence -- Magnetic fields -- Magnetic susceptibility -- Magnetostriction -- Polarization -- Samarium -- Single crystals -- Samarium compounds
Аннотация: Results of a complex investigation of the magnetic, magnetoelectric, and magnetoelastic properties of a SmFe3(BO3)(4) single crystal are presented. Samarium iron borate is similar to another easy-plane iron borate, NdFe3(BO3)(4), in that it possesses a large value of the magnetic-field-induced polarization (about 500 mu C/m(2)), the sign of which changes when the field direction is changed between axes a and b of the crystal. However, the temperature dependence of the magnetic susceptibility and the field dependence of polarization and magnetostriction of the two compounds are significantly different, which is explained by the weak effect of external magnetic field on the ground-state multiplet of samarium ion, which is characterized by an extremely small value of its g-factor.

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Держатели документа:
[Popov, Yu. F.
Pyatakov, A. P.
Kadomtseva, A. M.
Vorob'ev, G. P.] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia
[Pyatakov, A. P.
Zvezdin, A. K.
Mukhin, A. A.
Ivanov, V. Yu.] Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow 119991, Russia
[Gudim, I. A.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Department of Physics, Moscow State University, Moscow 119991, Russian Federation
Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow 119991, Russian Federation
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Popov, Y. F.; Pyatakov, A. P.; Kadomtseva, A. M.; Vorob'ev, G. P.; Zvezdin, A. K.; Mukhin, A. A.; Ivanov, V. Y.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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12.

IR active vibrations of a TbFe3(BO3)(4) crystal / M. I. Pashchenko [et al.] // Low Temp. Phys. - 2010. - Vol. 36, Is. 7. - P. 638-641 ; Физика низких температур, DOI 10.1063/1.3479413. - Cited References: 12 . - ISSN 1063-777X

РУБ Physics, Applied
Рубрики:
GDFE3(BO3)(4)
Аннотация: The IR reflection spectra of a TbFe3(BO3)(4) crystal are measured in the spectral range 200-2000 cm(-1) in E perpendicular to c polarization at temperatures 10 and 300 K. The reflection spectrum so obtained is analyzed and its interpretation is given on the basis of the internal vibrations of the ionic complexes BO33-, FeO69-, and TbO69- of the TbFe3(BO3)(4) crystal. Davydov splitting on the internal vibrational modes at a structural phase transition, which is accompanied by multiplication of the unit cell, was not observed in the experimental spectral range. This is due to the localization of the vibrations of the ionic complexes BO33-, FeO69-, and TbO69- of the TbFe3(BO3)(4) crystal. (c) 2010 American Institute of Physics. [doi:10.1063/1.3479413]

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Держатели документа:
[Pashchenko, M. I.
Bedarev, V. A.
Kut'ko, V. I.] Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
[Besmaternykh, L. N.
Temerov, V. L.] Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
B. Verkin Inst. for Low Temperature Physics, Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
L. V. Kirenskii Inst. of Physics, The Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Pashchenko, M. I.; Bedarev, V. A.; Kut'ko, V. I.; Besmaternykh, L. N.; Temerov, V. L.; Темеров, Владислав Леонидович

}
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13.

Magnetic structure in iron borates RFe3(BO3)(4) (R = Er, Pr): a neutron diffraction and magnetization study / C. . Ritter [et al.] // J. Phys.: Condens. Matter. - 2010. - Vol. 22, Is. 20. - Ст. 206002, DOI 10.1088/0953-8984/22/20/206002. - Cited References: 22. - This work was supported by RFBR, grant no. 10-02-00765, and by the Physical Sciences Department of RAS, project no. 1.1.1.1. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
GDFE3(BO3)(4)
DYFE3(BO3)(4)
CRYSTAL
Кл.слова (ненормированные):
Antiferromagnetics -- Crystallographic structure -- Iron borate -- Low temperatures -- Magnetic ordering -- Magnetic propagation -- Magnetization measurements -- Rare-earth sublattices -- Space Groups -- Spin reorientation -- Sub-lattices -- Temperature range -- Unit cells -- Anisotropy -- Antiferromagnetic materials -- Antiferromagnetism -- Erbium -- Erbium compounds -- Magnetic devices -- Magnetic properties -- Magnetic structure -- Magnetization -- Neutron diffraction -- Rare earths -- Single crystals -- Crystallography
Аннотация: Neutron diffraction, susceptibility and magnetization measurements (for R = Er only) were performed on iron borates RFe3(BO3)(4) (R = Pr, Er) to investigate details of the crystallographic structure, the low temperature magnetic structures and transitions and to study the role of the rare earth anisotropy. PrFe3(BO3)(4), which crystallizes in the spacegroup R32, becomes antiferromagnetic at T-N = 32 K, with t = [0 0 3/2], while ErFe3(BO3)(4), which keeps the P3(1)21 symmetry over the whole studied temperature range 1.5 K < T < 520 K, becomes antiferromagnetic below T-N = 40 K, with tau = [0 0 1/2]. Both magnetic propagation vectors lead to a doubling of the crystallographic unit cell in the c-direction. Due to the strong polarization of the Fe-sublattice, the magnetic ordering of the rare earth sublattices appears simultaneously at T-N. The moment directions are determined by the rare earth anisotropy: easy-axis along c for PrFe3(BO3)(4) and easy-plane a-b for ErFe3(BO3)(4). There are no spin reorientations present in either of the two compounds but there is the appearance below 10 K of a minority phase in the Er-compound adopting a 120 degrees arrangement of the Er-moments.

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Держатели документа:
[Ritter, C.] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[Vorotynov, A.
Pankrats, A.
Petrakovskii, G.
Temerov, V.
Gudim, I.] RAS, Siberian Branch, LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Petrakovskii, G.] Siberian Fed Univ, Krasnoyarsk, Russia
[Szymczak, R.] Inst Phys PAS, Warsaw, Poland
ИФ СО РАН
Institut Laue-Langevin, Boite Postale 156, F-38042 Grenoble, France
L v Kirenskii Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Physics PAS, Warsaw, Poland

Доп.точки доступа:
Ritter, C.; Vorotynov, A. M.; Воротынов, Александр Михайлович; Pankrats, A. I.; Панкрац, Анатолий Иванович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Szymczak, R.
}
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14.

Magnetic and specific heat properties of YFe3(BO3)(4) and ErFe3(BO3)(4) / E. A. Popova [et al.] // J. Phys.: Condens. Matter. - 2010. - Vol. 22, Is. 11. - Ст. 116006, DOI 10.1088/0953-8984/22/11/116006. - Cited References: 26. - This work was supported by DFG grants 436 RUS and HE 3439/6 (FOR 520). The authors are indebted to M N Popova and B Z Malkin for valuable discussions. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
LINEAR-CHAIN ANTIFERROMAGNETISM
   CRYSTAL-STRUCTURE
   GDFE3(BO3)(4)
   MULTIFERROICS
   BA2COS3
   ORDER
Кл.слова (ненормированные):
Antiferromagnetic orders -- Basal planes -- Experimental data -- Magnetically ordered state -- Antiferromagnetism -- Calorimetry -- Erbium -- Magnetic moments -- Single crystals -- Specific heat -- Magnetic domains
Аннотация: The present paper reports on the specific heat and magnetization of the YFe3(BO3)(4) and ErFe3(BO3)(4) single crystals. In both compounds, antiferromagnetic order of the iron spins evolves at T-N = 38 K. The experimental data suggest that the magnetic moments are in the basal plane of the trigonal crystal for both compounds. In the magnetically ordered state the crystal is subdivided into three types of domains, the magnetic moments of the Fe3+ ions being aligned along the a axis within each domain. For ErFe3(BO3)(4), two non-equivalent magnetic positions of the Er3+ ions in each domain are observed.

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Держатели документа:
[Popova, E. A.] Tech Univ, Moscow State Inst Elect & Math, Moscow 109028, Russia
[Vasiliev, A. N.] Moscow MV Lomonosov State Univ, Low Temp Phys & Superconduct Dept, Moscow 119991, Russia
[Temerov, V. L.
Bezmaternykh, L. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Tristan, N.
Klingeler, R.
Buechner, B.] Leibniz Inst Solid State & Mat Res IFW Dresden, D-01171 Dresden, Germany
ИФ СО РАН
Moscow State Institute of Electronics and Mathematics (Technical University), 109028 Moscow, Russian Federation
Low Temperature Physics and Superconductivity Department, Moscow State University, 119991 Moscow, Russian Federation
L v Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation
Leibniz-Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany

Доп.точки доступа:
Popova, E. A.; Vasiliev, A. N.; Temerov, V. L.; Темеров, Владислав Леонидович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Tristan, N.; Klingeler, R.; Buchner, B.
}
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15.

Magnetic structure in iron borates RFe(3)(BO(3))(4)(R= Y, Ho): a neutron diffraction and magnetization study / C. . Ritter [et al.] // J. Phys.: Condens. Matter. - 2008. - Vol. 20, Is. 36. - Ст. 365209, DOI 10.1088/0953-8984/20/36/365209. - Cited References: 16. - This work was supported by RFBR, grant no. 06-02-16255. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
GDFE3(BO3)(4)
CRYSTALS
ND3+
Аннотация: Neutron diffraction, susceptibility and magnetization measurements were performed on iron borates RFe(3)(BO(3))(4)(R = Y, Ho) to investigate the low temperature magnetic structures and to clarify the role of the rare earth in the formation of the long-range magnetic order. Both compounds see an identical magnetic propagation vector tau = [ 0, 0, 1/2] within the P3(1)21 crystallographic space group appear at Neel temperatures of T(N) = 37 K for the Y and TN = 38 K for the Ho compound. The strong polarization effect of the Fe sublattice on the Ho(3+) ions leads to the simultaneous ordering of both sublattices while the competition between their anisotropies governs the spin-reorientation process at T(SR) = 5 K. The results obtained are discussed in the framework of the determined structural details and the specific rare-earth ions present including information on compounds investigated earlier.

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Держатели документа:
[Ritter, C.] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[Vorotynov, A.
Pankrats, A.
Petrakovskii, G.
Temerov, V.
Gudim, I.] RAS, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Szymczak, R.] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
ИФ СО РАН
Institute Laue-Langevin, Boite Postale 156, F-38042 Grenoble, France
L V Kirenskii Institute of Physics, Siberian Branch, RAS, Krasnoyarsk 660036, Russian Federation
Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland

Доп.точки доступа:
Ritter, C.; Vorotynov, A. M.; Воротынов, Александр Михайлович; Pankrats, A. I.; Панкрац, Анатолий Иванович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Szymczak, R.
}
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16.

Another mechanism for the insulator-metal transition observed in Mott insulators / A. G. Gavriliuk [et al.] // Phys. Rev. B. - 2008. - Vol. 77, Is. 15. - Ст. 155112, DOI 10.1103/PhysRevB.77.155112. - Cited References: 26 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
ELECTRONIC-STRUCTURE
   SPIN TRANSITION
   HIGH-PRESSURES
   GDFE3(BO3)(4)
Аннотация: The two widely accepted mechanisms of the insulator-metal Mott-Hubbard transitions which have been considered up until now are driven by the band-filling or bandwidth effects. We found a different mechanism of the Mott-Hubbard insulator-metal transition, which is controlled instead by the changes in the Mott-Hubbard energy U. In contrast to the changes in the bandwidth W in the "bandwidth control" scenario or to the variations of the band-filling n parameter in the "band-filling" scenario, a dramatic decrease in the Mott-Hubbard energy U plays the key role in this mechanism. We have experimentally observed this type of the insulator metal transition in the transition metal oxide BiFeO(3). The decrease in the Mott-Hubbard energy is caused by the high-spin-low-spin crossover in the electronic d shell of 3d transition metal ion Fe(3+) with d(5) configuration under high pressure. The pressure-induced spin crossover in BiFeO(3) was investigated and confirmed by synchrotron x-ray diffraction, nuclear forward scattering, and x-ray emission methods. The insulator-metal transition at the same pressures was found by the optical absorption and dc resistivity measurements.

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Держатели документа:
[Gavriliuk, Alexander G.
Struzhkin, Viktor V.] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA
[Gavriliuk, Alexander G.
Lyubutin, Igor S.] Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
[Gavriliuk, Alexander G.] RAS, Inst High Pressure Phys, Moscow 142190, Russia
[Ovchinnikov, Sergey G.] Russian Acad Sci, Siberian Div, Inst Phys, Krasnoyarsk 660036, Russia
[Ovchinnikov, Sergey G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Hu, Michael Y.
Chow, Paul] HPCAT, Argonne, IL 60439 USA
[Hu, Michael Y.
Chow, Paul] ANL, APS, Carnegie Inst Washington, Argonne, IL 60439 USA
ИФ СО РАН
Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, United States
Institute of Crystallography, Russian Academy of Sciences, Leninsky Prospekt 59, Moscow 119333, Russian Federation
Institute for High Pressure Physics, RAS, Troitsk, 142190, Russian Federation
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
HPCAT, Carnegie Institution of Washington, APS, Argonne, IL 60439, United States

Доп.точки доступа:
Gavriliuk, A. G.; Struzhkin, V. V.; Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Hu, M. Y.; Chow, P.
}
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17.

Magnetization and specific heat of DyFe3(BO3)(4) single crystal / E. A. Popova [et al.] // Eur. Phys. J. B. - 2008. - Vol. 62, Is. 2. - P. 123-128, DOI 10.1140/epjb/e2008-00146-5. - Cited References: 18 . - ISSN 1434-6028

РУБ Physics, Condensed Matter
Рубрики:
IRON
NDFE3(BO3)(4)
GDFE3(BO3)(4)
Кл.слова (ненормированные):
Antiferromagnetic orders -- Iron subsystems -- Antiferromagnetic materials -- Dysprosium compounds -- Magnetic field effects -- Magnetization -- Specific heat -- Thermodynamics -- Single crystals
Аннотация: We present thermodynamic and magnetic studies of single crystalline DyFe3(BO3)(4). The data indicate an easy axis antiferromagnetic order below T-N similar to 38 K which we attribute to the Fe subsystem. The Dy subsystem remains paramagnetic down to the lowest investigated temperatures of 2 K, but it is polarized by the Fe spins due to a f-d interaction. External magnetic field leads to a spin-flop transition in the iron subsystem as well as to superposed magnetization in the Dy subsystem. The repopulation of two low-lying Kramers doublets in Dy3+ ions results in well defined Schottky anomalies in specific heat and magnetization.

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Держатели документа:
Vasiliev, A. N.] Moscow MV Lomonosov State Univ, Low Temp Phys Dept, Moscow 119991, Russia
Klingeler, R.] IFW Dresden, Leibniz Inst Soild State & Mat Res, D-01171 Dresden, Germany
Bezmaternykh, L. N.] RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Low Temperature Physics Department, Moscow State University, Moscow 119991, Russian Federation
Leibniz Institute for Solid State and Materials Research, IFW Dresden, Dresden 01171, Germany
L.V. Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Popova, E. A.; Tristan, N.; Vasiliev, A. N.; Temerov, V. L.; Темеров, Владислав Леонидович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Leps, N.; Buechner, B.; Klingeler, R.
}
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18.

Investigation of the iron borates DyFe3(BO3)(4) and HoFe3(BO3)(4) by the method of Er3+ spectroscopic probe / T. N. Stanislavchuk [et al.] // Phys. Lett. A. - 2007. - Vol. 368, Is. 5. - P. 408-411, DOI 10.1016/j.physleta.2007.04.044. - Cited References: 16 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
GDFE3(BO3)(4)
CRYSTALS
Кл.слова (ненормированные):
rare-earth iron borates -- magnetic ordering -- optical spectroscopy -- Magnetic ordering -- Optical spectroscopy -- Rare-earth iron borates
Аннотация: Temperature-dependent high-resolution optical spectra of the Er3+ probe ion in DyFe3(BO3)(4) and HoFe3(BO3)(4) are reported. The data provide the temperature of magnetic ordering and direction of the Fe3+ magnetic moments. Both compounds order magnetically at T-N = 39 +/- 1K. The magnetic structure of DyFe3(BO3)(4) is of the easy-axis type, while that of HoFe3(BO3)(4) is of the easy-plane type. The role of anisotropic interactions between the iron and the rare-earth subsystems is discussed. (c) 2007 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia
LV Kirenskii Inst Phys, RAS, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Spectroscopy, Russian Academy of Sciences, 142190 Troitsk, Moscow region, Russian Federation
L.V. Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Stanislavchuk, T. N.; Chukalina, E. P.; Popova, M. N.; Bezmaternykh, L. N.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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19.

Magnetoelectric interactions in rare-earth ferroborates / A. M. Kadomtseva [et al.] // J. Exp. Theor. Phys. - 2007. - Vol. 105, Is. 1. - P. 116-119, DOI 10.1134/S1063776107070254. - Cited References: 14 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GDFE3(BO3)(4)
Кл.слова (ненормированные):
Gadolinium compounds -- Magnetoelectric effects -- Phase transitions -- Polarization -- Single crystals -- Magnetic control -- Magnetoelectric interactions -- Rare earth ferroborates -- Torque curves -- Rare earths
Аннотация: Magnetic-field-induced phase transitions in single crystals of the rare-earth ferroborates GdFe3(BO3)(4) and NdFe3(BO3)(4) have been studied by measuring magnetoelectric dependences and torque curves. These phase transitions can serve as one of the possible mechanisms for magnetic control of electric polarization. Magnetic phase transitions in GdFe3(BO3)(4) are analyzed theoretically.

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Держатели документа:
Moscow MV Lomonosov State Univ, Moscow 119992, Russia
Russian Acad Sci, Inst Gen Phys, Moscow 119991, Russia
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Moscow State University, Moscow 119992, Russian Federation
Institute of General Physics, Russian Academy of Sciences, ul. Vavilova 38, Moscow 119991, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Kadomtseva, A. M.; Zvezdin, A. K.; Pyatakov, A. P.; Kuvardin, A. V.; Vorob'ev, G. P.; Popov, Y. F.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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20.

Magnetization and specific heat of TbFe3(BO3)(4): Experiment and crystal-field calculations / E. A. Popova [et al.] // Phys. Rev. B. - 2007. - Vol. 75, Is. 22. - Ст. 224413, DOI 10.1103/PhysRevB.75.224413. - Cited References: 22 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
GDFE3(BO3)(4)
MAGNETOSTRICTION
Аннотация: We have studied the thermodynamic properties of single-crystalline TbFe3(BO3)(4). Magnetization measurements have been carried out as a function of magnetic field (up to 50 T) and temperature up to 350 K with the magnetic field both parallel and perpendicular to the trigonal c axis of the crystal. The specific heat has been measured in the temperature range 2-300 K with a magnetic field up to 9 T applied parallel to the c axis. The data indicate a structural phase transition at 192 K and antiferromagnetic spin ordering at T-N approximate to 40 K. A Schottky anomaly is present in the specific-heat data around 20 K, arising due to two low-lying energy levels of the Tb3+ ions being split by f-d coupling. Below T-N, magnetic fields parallel to the c axis drive a spin-flop phase transition, which is associated with a large magnetization jump. The highly anisotropic character of the magnetic susceptibility is ascribed mainly to the Ising-like behavior of the Tb3+ ions in the trigonal crystal field. We describe our results in the framework of a unified approach which is based on mean-field approximation and crystal-field calculations.

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Держатели документа:
Moscow MV Lomonosov State Univ, Fac Phys, Low Temp Phys Dept, Moscow 119992, Russia
Bryansk State Tech Univ, Bryansk 241035, Russia
RAS, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
IFW Dresden, Leibniz Inst Solid State & Mat Res, D-01171 Dresden, Germany
ИФ СО РАН
Low Temperature Physics Department, Physics Faculty, Moscow State University, 119992 Moscow, Russian Federation
Bryansk State Technical University, 241035 Bryansk, Russian Federation
L.V. Kirensky Institute of Physics, Siberian Branch of RAS, 660036 Krasnoyarsk, Russian Federation
Leibniz-Institute for Solid State and Materials Research, IFW Dresden, 01171 Dresden, Germany

Доп.точки доступа:
Popova, E. A.; Volkov, D. V.; Vasiliev, A. N.; Demidov, A. A.; Kolmakova, N. P.; Gudim, I. A.; Гудим, Ирина Анатольевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Tristan, N.; Skourski, Y.; Buchner, B.; Hess, C.; Klingeler, R.
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