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1.
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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2.
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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3.
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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4.
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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5.
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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6.
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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7.
Magnetoelectric and magnetoelastic
interactions in NdFe3(
BO3
)(4) multiferroics / A. K. Zvezdin [et al.]> // JETP Letters. - 2006. -
Vol. 83
,
Is. 11
. - P. 509-514,
DOI
10.1134/S0021364006110099. - Cited References: 9. - We are grateful to M.N. Popova and A.N. Vasil’ev for their constant interest in this work. This work was supported by the Russian Foundation for Basic Research (project nos. 04-02-16592-a, 05-02-16997-a, and 04-02-81046-Bel2004-a) and in part by the “Dynasty” Foundation. A.P.P. acknowledges the support of the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-3764.2005). . - ISSN 0021-3640
РУБ
Physics, Multidisciplinary
Рубрики:
GDFE3
(
BO3
)(4)
Аннотация:
Complex experimental and theoretical investigations of the magnetic, magnetoelectric, and magnetoelastic properties of neodymium iron borate NdFe3(
BO3
)(4) along various crystallographic directions have been carried out in strong pulsed magnetic fields up to 230 kOe in a temperature range of 4.2-50 K. It has been found that neodymium iron borate, as well as gadolinium iron borate, is a multiferroic. It has a much larger (above 300 mu C/m(2)) electric polarization controlled by the magnetic field and giant quadratic magnetoelectric effect. The exchange field between the rare-earth and iron subsystems (similar to 50 kOe) has been determined for the first time from experimental data. The theoretical analysis based on the magnetic symmetry and quantum properties of the Nd ion in the crystal provides an explanation of the unusual behavior of the magnetoelectric and magnetoelastic properties of neodymium iron borate in strong magnetic fields and correlation observed between them.
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Публикация на русском языке
Магнитоэлектрические и магнитоупругие взаимодействия в мультиферроиках NdFe3(
BO3
)4 [Текст] / А. К. Звездин, Г. П. Воробьев, А. М. Кадомцева [и др.] // Письма в ЖЭТФ. - 2006. - Т. 83 Вып. 11. - С. 600-605
Держатели документа:
Russian Acad Sci, Inst Gen Phys, Moscow 119991, Russia
Moscow MV Lomonosov State Univ, Moscow 119992, Russia
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of General Physics, Russian Academy of Sciences, Moscow, 119991, Russian Federation
Moscow State University, Moscow, 119992, Russian Federation
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Zvezdin, A. K.; Vorob'ev, G. P.; Kadomtseva, A. M.; Popov, Y. F.; Pyatakov, A. P.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Kuvardin, A. V.; Popova, E. A.
}
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8.
Magnetic anisotropy and
magnetoelectric properties of Tb1-x Er (x) Fe-3(
BO3
)(4) ferroborates / A. K. Zvezdin [et al.]> // J. Exp. Theor. Phys. - 2009. -
Vol. 109
,
Is. 1
. - P. 68-73,
DOI
10.1134/S1063776109070097. - Cited References: 18. - This study was supported by the Russian Foundation for Basic Research (project no. 07-02-00580). . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
GDFE3
(
BO3
)(4)
Кл.слова (ненормированные):
Competing exchange
--
Complex compositions
--
Critical fields
--
Electric polarization
--
Er concentrations
--
Exchange splitting
--
Ferroborates
--
G factors
--
Magnetoelectric properties
--
Nonmonotonic
--
Simple model
--
Spin-flop transitions
--
Composite micromechanics
--
Erbium
--
Ions
--
Magnetic anisotropy
--
Magnetostriction
--
Magnetostrictive devices
--
Phase transitions
--
Polarization
--
Spin dynamics
--
Terbium alloys
--
Single crystals
Аннотация:
Magnetic and magnetoelectric properties of ferroborate single crystals with complex composition (Tb1 - x Er (x) Fe-3(
BO3
)(4), x = 0, 0.75) and with competing exchange Tb-Fe and Er-Fe interactions are investigated. Jumps in electric polarization, magnetostriction, and magnetization are observed as a result of spin-flop transitions, as well as a considerable decrease in the critical field upon an increase in the Er concentration, in a field H (c) parallel to the c axis. The observed behavior of phase-transition fields is analyzed and explained using a simple model taking into account anisotropy in g factors and exchange splitting of funda-mental doublets of the easy-axis Tb3+ ion and easy-plane Er3+ ion. It is established that magnetoelectric and magnetostriction anomalies under spin-flop transitions are mainly controlled by the Tb subsystem. The Tb subsystem makes a nonmonotonic contribution Delta P (a) (H (a) , T) to polarization along the a axis: the value of Delta P (a) reverses its sign and increases with temperature due to the contribution from the excited states of the Tb3+ ion.
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Держатели документа:
[Zvezdin, A. K.
Pyatakov, A. P.
Ivanov, V. Yu.
Kuz'menko, A. M.
Mukhin, A. A.] Russian Acad Sci, Prokhorov Inst Gen Phys, Moscow 119991, Russia
[Kadomtseva, A. M.
Popov, Yu. F.
Vorob'ev, G. P.
Pyatakov, A. P.] Moscow MV Lomonosov State Univ, Moscow 119992, Russia
[Bezmaternykh, L. N.
Gudim, I. A.] Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660038, Russia
ИФ СО РАН
Moscow State University, Moscow 119992, Russian Federation
Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow 119991, Russian Federation
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660038, Russian Federation
Доп.точки доступа:
Zvezdin, A. K.; Kadomtseva, A. M.; Popov, Y. F.; Vorob'ev, G. P.; Pyatakov, A. P.; Ivanov, V. Y.; Kuz'menko, A. M.; Mukhin, A. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Research [07-02-00580]
}
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9.
Breaking of the
Selection Rules for Optical Transitions in the Dielectric PrFe3(
BO3
)(4) Crystal by a Praseodymium-Iron Exchange Interaction / M. N. Popova [et al.]> // Phys. Rev. Lett. - 2009. -
Vol. 102
,
Is. 18
. - Ст. 187403,
DOI
10.1103/PhysRevLett.102.187403. - Cited References: 26. - This work was supported in part by the RFBR under Grants No. 07-02-01185 and No. 07-02-00704 and by the Russian Academy of Sciences under the Programs for Basic Research. . - ISSN 0031-9007
РУБ
Physics, Multidisciplinary
Рубрики:
SINGLE-CRYSTAL
GDFE3
(
BO3
)(4)
PHASE
DYFE3(
BO3
)(4)
SPECTRUM
LINES
Кл.слова (ненормированные):
Magnetic ordering temperatures
--
Optical spectrum
--
Order parameters
--
Point symmetries
--
Selection rules
--
Exchange interactions
--
Neon
--
Praseodymium
--
Single crystals
--
Crystal symmetry
Аннотация:
We report on the emergence of new lines in the optical spectrum of the PrFe3(
BO3
)(4) single crystal at the magnetic ordering temperature. The transitions between singlet crystal-field sublevels of Pr3+ ion with the same transformational properties, strictly forbidden for the trigonal D-3 point symmetry of this ion in PrFe3(
BO3
)(4), appear below the Neel temperature and grow in intensity as a square of the order parameter. We show that the phenomenon originates from the mixing of wave functions of different Pr3+ sublevels by the Pr-Fe exchange interaction.
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Держатели документа:
[Popova, M. N.
Stanislavchuk, T. N.] Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia
[Malkin, B. Z.] Kazan VI Lenin State Univ, Kazan 420008, Russia
[Bezmaternykh, L. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Spectroscopy, Russian Academy of Sciences, 142190 Troitsk, Moscow region, Russian Federation
Kazan State University, 420008 Kazan, Russian Federation
L.V. Kirensky Institute of Physics, Siberian Branch, RAS, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Popova, M. N.; Stanislavchuk, T. N.; Malkin, B. Z.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; RFBR [07-02-01185, 07-02-00704]; Russian Academy of Sciences
}
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10.
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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11.
Magnetic structure, magnetic
interactions and metamagnetism in terbium iron borate TbFe3(
BO3
)(4): a neutron diffraction and magnetization study / C. . Ritter [et al.]> // J. Phys.: Condens. Matter. - 2007. -
Vol. 19
,
Is. 19
. - Ст. 196227,
DOI
10.1088/0953-8984/19/19/196227. - Cited References: 15 . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
GDFE3
(
BO3
)(4)
Кл.слова (ненормированные):
Magnetic structure
--
Magnetic susceptibility
--
Metamagnetism
--
Neutron diffraction
--
Neutron scattering
--
Phase transitions
--
Aneutron diffraction
--
Magnetic interactions
--
Neutron scattering measurements
--
Terbium iron borate
--
Terbium compounds
Аннотация:
Magnetization, susceptibility and neutron scattering measurements were performed on the terbium iron borate TbFe3(
BO3
)(4). Structural and magnetic phase transitions were obtained as a function of external magnetic field and temperature. A metamagnetic transition of the terbium spins and a spin-flop transition of the iron sublattice are obtained at an external magnetic field 35 kOe < Ht < 60 kOe. The values of the effective exchange HE and the anisotropy HA fields are evaluated. Temperature dependent neutron diffraction studies reveal the magnetic structure of TbFe3(BO3)(4) and the thermal evolution of the two magnetic sublattices. An antiferromagnetic coupling along the helicoidal chains of Fe atoms sets in at 40 K with a propagation vector k = [ 0 0 1/2]. The magnetic ordering of the Tb sublattice sets in at the same temperature and leads to an anti-parallel alignment of the Fe and Tb moments within the a-b-planes with mu(Fe) = 4.4 mu(B) and mu(Tb) = 8.6 mu(B) at 2 K.
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Держатели документа:
Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
RAS, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
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
Доп.точки доступа:
Ritter, C.; Balaev, A. D.; Балаев, Александр Дмитриевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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12.
Simultaneous antiferromagnetic Fe3+
and Nd3+ ordering in NdFe3((
BO3
)-B-11)(4) / P. . Fischer [et al.]> // J. Phys.: Condens. Matter. - 2006. -
Vol. 18
,
Is. 34
. - P. 7975-7989,
DOI
10.1088/0953-8984/18/34/010. - Cited References: 20 . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
PHASE-TRANSITION
DIFFRACTION
CRYSTALS
GDFE3
(
BO3
)(4)
SINQ
Кл.слова (ненормированные):
Iron compounds
--
Magnetic moments
--
Magnetization
--
Neodymium compounds
--
Neutron diffraction
--
Vectors
--
Crystal-field effects
--
Free ion moment
--
Specific heat measurements
--
Symmetry analysis
--
Antiferromagnetic materials
Аннотация:
By means of magnetic susceptibility and specific heat measurements, x-ray and unpolarized neutron diffraction investigations on powder and single-crystal samples, simultaneous long-range antiferromagnetic Fe and Nd ordering in NdFe3((
BO3
)-B-11)(4) with R32 chemical structure has been found at temperatures below T-N = 30.5(5) K down to 1.6 K. At temperatures down to 19 K the propagation vector is k(hex) = [0, 0, 3/2] and becomes slightly incommensurate at lower temperatures. Combined with symmetry analysis, best powder neutron profile fits are obtained with magnetic spiral configurations with the magnetic moments oriented parallel to the hexagonal basal plane according to the irreducible representations tau(3) in the commensurate case. This is in agreement with the easy directions of magnetization perpendicular to the c-axis as determined by magnetic susceptibility measurements. At 1.6 K the magnetic Fe moment amounts to 4.9 mu(B) B close to the free ion moment of Fe3+. The magnetic Nd3+ moment saturates presumably due to crystal-field effects at 2.7 mu(B).
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Держатели документа:
ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, CH-5232 Villigen, Switzerland
Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
RAS, SB, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Laboratory for Neutron Scattering, ETH Zurich, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
Physik Department E21, TU Munchen, D-85748 Garching, Germany
Institute of Physics SB RAS, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Fischer, P.; Pomjakushin, V.; Sheptyakov, D.; Keller, L.; Janoschek, M.; Roessli, B.; Schefer, J.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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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.
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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15.
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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16.
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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17.
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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18.
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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19.
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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20.
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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