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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chukalina E. P., Kuritsin D. Y., Popova M. N., Bezmaternykh L. N., Kharlamova S. A., Temerov V. L.
Заглавие : Magnetic ordering of NdFe3(BO3)(4) studied by infrared absorption spectroscopy
Разночтения заглавия :авие SCOPUS: Magnetic ordering of NdFe3(BO3)4 studied by infrared absorption spectroscopy
Место публикации : Phys. Lett. A. - 2004. - Vol. 322, Is. 3-4. - P.239-243. - ISSN 0375-9601, DOI 10.1016/j.physleta.2003.12.062
Примечания : Cited References: 8
Предметные рубрики: CRYSTALS
Ключевые слова (''Своб.индексиров.''): ferroborates--fourier-transform spectroscopy--magnetic ordering--ferroborates--fourier-transform spectroscopy--magnetic ordering--iron--neodymium--absorption spectroscopy--article--electronics--infrared spectroscopy--magnetism--molecular interaction--molecular physics--temperature
Аннотация: We report the first measurements of the optical spectra of NdFe3(BO3)(4), a promising material for optoelectronics. Exchange splitting of Nd3+ spectral lines due to magnetic interactions in a magnetically ordered state was observed. The temperature dependences of the exchange splitting and of the linewidth point to the temperature T-c 33 +/- 1K of the magnetic ordering in both iron and neodymium. magnetic subsystems. 2004 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zabluda V. N., Ovchinnikov S. G., Potseluliko A. M., Kharlamova S. A.
Заглавие : Optical properties and electronic structure of rare-earth ferroborates
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 3. - P489-494. - ISSN 1063-7834, DOI 10.1134/1.1884710
Примечания : Cited References: 19. - This work was supported by the Russian Foundation for Basic Research (project no. 03-02-16268) and the program of the Department of Physical Sciences of the Russian Academy of Sciences "Strongly Correlated Electrons"
Предметные рубрики: TRIGONAL GDFE3(BO3)(4)
MAGNETIC-PROPERTIES
BAND-STRUCTURE
FEBO3
ABSORPTION
Аннотация: The optical absorption spectra of single-crystal ferroborate GdFe3(BO3)(4) and GdFe2.1Ga0.9(BO3)(4) are measured and interpreted. It is found that the absorption edge and the absorption bands A, B, and C observed below the edge are close to those for FeBO3. A many-electron model of the band structure of GdFe3(BO3)(4) is suggested including strong electron correlations between the iron d states. It is shown that GdFe3(BO3)(4) has a charge-transfer dielectric gap. A rise in pressure is predicted to result in a crossover between the high-spin and low-spin states of the Fe ion, collapse of the magnetic moment, a weakening of Coulomb correlations, an abrupt reduction in the energy gap, and an insulator-semiconductor transition. (c) 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G.
Заглавие : The mechanism of the electronic transition in ferroborates under high pressure
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2005. - Vol. 17: 2nd International Symposium on Physics of Solids Under High Pressure Using Nuclear Probes (JUL 20-24, 2004, Cologne, GERMANY), Is. 11. - P.S743-S751. - ISSN 0953-8984, DOI 10.1088/0953-8984/17/11/003
Примечания : Cited References: 20
Предметные рубрики: STRUCTURAL PHASE-TRANSITION
MAGNETIC COLLAPSE
OPTICAL-SPECTRA
BAND-STRUCTURE
FEBO3
MODEL
Ключевые слова (''Своб.индексиров.''): carrier concentration--correlation methods--electron transitions--high pressure effects--magnetic moments--mathematical models--metal insulator transition--crystal field--electron correlations--electronic transition--ferroborates--ferromagnetic materials
Аннотация: A novel mechanism for the insulator-semiconductor transition and magnetic collapse in FeBO3 is proposed in the framework of the multielectron model with account taken of strong electron correlations. The electronic transition results from the crossover of the high spin and low spin Fe3+ states induced by the crystal field increasing with pressure. In the high pressure phase a semiconductor-metal transition is expected.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bayukov O. A., Gavrilyuk A. M., Zabluda V. N., Lyubutin I. S., Ovchinnikov S. G., Potseluyko A. M., Tomas M., Trojan I. A., Kharlamova S. A.
Заглавие : Studies of magnetic and optic properties of rare-earth gallo-ferroborates by Mossbauer and optical spectroscopy
Место публикации : Physica B: ELSEVIER SCIENCE BV, 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P1321-1323. - ISSN 0921-4526, DOI 10.1016/j.physb.2005.01.397
Примечания : Cited References: 3
Ключевые слова (''Своб.индексиров.''): strongly correlated electron system--antiferromagnets--borates--antiferromagnets--borates--strongly correlated electron system--antiferromagnetism--cryostats--energy gap--magnetic moments--magnetic properties--mossbauer spectroscopy--optical properties--single crystals--borates--coulomb correlations--liquid helium--strongly correlated electron systems--gadolinium compounds
Аннотация: Magnetic and optical properties of GdFe3-xGax(BO3)(4) single crystals are investigated by Mossbauer and optical spectroscopy. The GdFe3(BO3)(4) multielectron band structure model is derived. A high- and low-spin crossover of Fe3+ ion, a collapse of the magnetic moment, the suppression of Coulomb correlations, and insulator-semiconductor transition are predicted. The jump of an energy gap is measured at pressure 43 GPa. (c) 2005 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kadomtseva A. M., Zvezdin A. K., Pyatakov A. P., Kuvardin A. V., Vorob'ev G. P., Popov Y. F., Bezmaternykh L. N.
Заглавие : Magnetoelectric interactions in rare-earth ferroborates
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 105, Is. 1. - P116-119. - ISSN 1063-7761, DOI 10.1134/S1063776107070254
Примечания : Cited References: 14
Предметные рубрики: GDFE3(BO3)(4)
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov Y. F., Kadomtseva A. M., Vorob'ev G. P., Mukhin A. A., Ivanov V. Y., Kuz'menko A. M., Prokhorov A. S., Bezmaternykh L. N., Temerov V. L.
Заглавие : Observation of spontaneous spin reorientation in Nd1-x Dy (x) Fe-3(BO3)(4) ferroborates with a competitive R-Fe exchange
Коллективы : Russian Foundation for Basic Research [07-02-00580-a]
Разночтения заглавия :авие SCOPUS: Observation of spontaneous spin reorientation in Nd1 - X Dy x Fe3(BO3)4 ferroborates with a competitive R-Fe exchange
Место публикации : JETP Letters. - 2009. - Vol. 89, Is. 7. - P.345-351. - ISSN 0021-3640, DOI 10.1134/S002136400907008X
Примечания : Cited References: 14. - We are deeply grateful to A. K. Zvezdin and A. P. Pyatakov for useful advice and to E. A. Popova for placing the DyFeINF3/INF(BOINF3 /INF)INF4INF single crystal at our disposal. This work was supported by the Russian Foundation for Basic Research ( project no. 07-02-00580-a).
Предметные рубрики: TRIGONAL GDFE3(BO3)(4)
MAGNETIC-PROPERTIES
DYFE3(BO3)(4)
Аннотация: The magnetic, magnetoelectric, and magnetoelastic properties of DyFe3(BO3)(4) single crystals and the Nd0.75Dy0.25Fe3(BO3)(4) substituted compound with the competitive Nd-Fe and Dy-Fe exchange interactions have been investigated in magnetic fields up to 210 kOe. It has been shown that the antiferromagnetic state in Nd0.75Dy0.25Fe3(BO3)(4) below the N,el temperature is easy-plane and a spontaneous spin-reorientation transition to a uniaxial state occurs near 25 K. Anomalies are observed in various physical characteristics in a spin-flop transition induced by the magnetic field along the trigonal axis. The H-T phase diagrams are constructed; they are in good agreement with a simple model taking into account the anisotropy of the exchange splitting and g factors of the ground doublets of the Dy3+ and Nd3+ ions. The features of the magnetoelectric effect in various magnetic phases have been studied. Spontaneous electric polarization has been revealed in the region of the existence of an easy-plane antiferromagnetic state in the substituted compound. A qualitative theoretical justification of the possibility of the appearance of the spontaneous spin-reorientation transition in the Nd0.75Dy0.25Fe3(BO3)(4) substituted compound is given.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Nelson, Christie, Haiding Mo, Bezmaternykh L.N., Gudim I.A.
Заглавие : Magnetic Structure of the Field?Induced Polarization Phases of Rare Earth Ferroborates
Коллективы : International Conference on Magnetism
Место публикации : 18th International Conference on Magnetism (ICM-2009). - 2009. - Ст.Mo-A-5.1-03
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : 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., Gudim I. A.
Заглавие : Magnetic anisotropy and magnetoelectric properties of Tb1-x Er (x) Fe-3(BO3)(4) ferroborates
Коллективы : Russian Foundation for Basic Research [07-02-00580]
Разночтения заглавия :авие SCOPUS: Magnetic anisotropy and magnetoelectric properties of Tb1 - X Er xFe3(BO3)4 ferroborates
Место публикации : J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 1. - P.68-73. - ISSN 1063-7761, DOI 10.1134/S1063776109070097
Примечания : Cited References: 18. - This study was supported by the Russian Foundation for Basic Research (project no. 07-02-00580).
Предметные рубрики: GDFE3(BO3)(4)
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kadomtseva A. M., Popov Y. F., Vorob'ev G. P., Pyatakov A. P., Krotov S. S., Kamilov K. I., Ivanov V. Y., Mukhin A. A., Zvezdin A. K., Kuz'menko A. M., Bezmaternykh L. N., Gudim I. A., Temerov V. L.
Заглавие : Magnetoelectric and magnetoelastic properties of rare-earth ferroborates
Коллективы :
Место публикации : Low Temp. Phys. - 2010. - Vol. 36, Is. 6. - P.511-521. - ISSN 1063-777X, DOI 10.1063/1.3457390; \b Физика низких температур
Примечания : Cited References: 37. - This work was performed with financial support from RFFI (grant No. 10-02-00848-a).
Аннотация: The magnetic, electric, magnetoelectric, and magnetoelastic properties of rare-earth ferroborates RFe(3)(BO(3))(4) (R=Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er) as well as yttrium ferroborate YFe(3)(BO(3))(4) have been studied comprehensively. A strong dependence not only of the magnetic but also magnetoelectric properties on the type of rare-earth ion, specifically, on its anisotropy, which determines the magnetic structure and the large contribution to the electric polarization, has been found. This is manifested in the strong temperature dependence of the polarization below the Neel point T(N) and its specific field dependence, which is determined by the competition between the external and exchange f-d fields. A close correlation has been found between the magnetoelastic properties of ferroborates and the magnetoelastic and magnetic anomalies at magnetic-field induced phase transitions. It is found that in easy-plane ferroborates, together with magnetic-field induced electric polarization spontaneous polarization also arises below the Neel point. The ferroelectric ordering in ferroborates is of extrinsic character, giving rise to strong magnetoelectric coupling below T(N). Aside from the antiferromagnetic phase transition, the particulars of the structural phase transition accompanied by anomalies of the dielectric and magnetoelectric properties are examined for the first time. The character of the dielectric anomalies at a structural transition is analyzed for the first time on the basis of Landau's approach. (c) 2010 American Institute of Physics. [doi:10.1063/1.3457390]
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'menko A. M., Mukhin A. A., Ivanov V. Y., Kadomtseva A. M., Lebedev S. P., Bezmaternykh L. N.
Заглавие : Antiferromagnetic Resonance and Dielectric Properties of Rare-earth Ferroborates in the Submillimeter Frequency Range
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 1. - P113-120. - ISSN 1063-7761, DOI 10.1134/S106377611105013X
Примечания : Cited References: 27. - This work was supported by the Russian Foundation for Basic Research, project no. 10-02-00846.
Предметные рубрики: GDFE3(BO3)(4)
SPECTROSCOPY
CRYSTAL
Ключевые слова (''Своб.индексиров.''): antiferromagnetic resonance--basic parameters--effective anisotropy constant--ferroborates--ferroics--ferromagnetic orderings--frequency ranges--magnetic interactions--magnetoresonance--millimeter frequency range--rare earth ions--submillimeters--antiferromagnetic materials--crystallography--erbium--europium--ferromagnetic resonance--ion exchange--magnetic anisotropy--magnetic devices--magnetic structure--permittivity--resonance--antiferromagnetism
Аннотация: The magnetoresonance and dielectric properties of a number of crystals of a new family of multiferroics, namely, rare-earth ferroborates RFe(3)(BO(3))(4) (R = Y, Eu, Pr, Tb, Tb(0.25)Er(0.75)), are studied in the submillimeter frequency range (nu = 3-20 cm(-1)). Ferroborates with R = Y, Tb, and Eu exhibit permittivity jumps at temperatures of 375, 198, and 58 K, respectively, which are caused by the R32 - P3(1)2(1) phase transition. Antiferromagnetic resonance (AFMR) modes in the subsystem of Fe(3+) ions are detected in the range of antiferromagnetic ordering (T T(N)
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'menko A. M., Mukhin A. A., Ivanov V. Yu., Kadomtseva A. M., Lebedev S. P., Bezmaternykh L. N.
Заглавие : Antiferromagnetic Resonance and Dielectric Properties of Rare-earth Ferroborates in the Submillimeter Frequency Range
Место публикации : J. Exp. Theor. Phys. - MOSCOW: PLEIADES PUBLISHING INC, 2011. - Vol. 113, Is. 1. - С. 113-120. - JUL. - ISSN 1063-7761, DOI 10.1134/S106377611105013X. - ISSN 1090-6509
Примечания : Cited Reference Count: 27. - Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [10-02-00846], This work was supported by the Russian Foundation for Basic Research, project no. 10-02-00846.
Предметные рубрики: Physics, Multidisciplinary
Аннотация: The magnetoresonance and dielectric properties of a number of crystals of a new family of multiferroics, namely, rare-earth ferroborates RFe3(BO3)(4) (R = Y, Eu, Pr, Tb, Tb0.25Er0.75), 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 Fe3+ ions are detected in the range of antiferromagnetic ordering (T≺T-N=30-40K) in all ferroborates that have either an easy-plane (Y, Eu) or easy-axis (Pr, Tb, Tb0.25Er0.75) 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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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Tugarinov V. I., Pankrats A. I., Kondyan S., Velikanov D. A., Temerov V. L.
Заглавие : Antiferromagnetic resonance and magnetic investigations of rare-earth ferroborates
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2011): Book of abstracts. - 2011. - Ст.24OR-O-10. - P.623
Примечания : Библиогр.: 3. - Work is supported by RFBR grant 10-02-00765
Материалы конференции,
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Демидов А. А., Гудим, Ирина Анатольевна, Еремин, Евгений Владимирович
Заглавие : Магнитные фазовые переходы в ферроборатах Nd1-xDyxFe3(BO3)4
Место публикации : Журн. эксперим. и теор. физ.: Наука, 2012. - Т. 141, Вып. 2. - С. 294-309. - ISSN 0044-4510
Примечания : Библиогр.: 29 назв. - Работа выполнена при финансовой поддержке гранта Президента РФ (МК-497.201.2)
ГРНТИ : 29.19.39
Аннотация: Исследованы магнитные свойства монокристаллов ферроборатов замещенных составов Nd1-xDyxFe3(BO3)4 (x=0.15, 0.25) с конкурирующими обменными Nd-Fe- и Dy-Fe-взаимодействиями. Для каждого состава обнаружены спонтанный спин-переориентационный переход из легкоосного в легкоплоскостное состояние и ступенчатые аномалии на кривых намагничивания при спин-флоп-переходе, индуцируемом магнитным полем B || c. Измеренные свойства и эффекты проинтерпретированы в рамках единого теоретического подхода, который базируется на приближении молекулярного поля и расчетах в модели кристаллич. поля для редкоземельного иона. Описаны экспериментальные температурные зависимости начальной магнитной восприимчивости от T=2 K до T=300 K, аномалии на кривых намагничивания при B || c в полях до 1,8 Тл, их эволюция с температурой, а также температурные и полевые зависимости намагниченности в полях до 9 Тл. При интерпретации экспериментальных данных определены параметры кристаллического поля тригональной симметрии для редкоземельной подсистемы и параметры обменных Nd-Fe- и Dy-Fe-взаимодействий.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Demidov A. A., Gudim, I. A., Eremin E. V.
Заглавие : Magnetic properties of Nd0.9Dy0.1Fe3(BO3)4
Место публикации : Physica B: Elsevier Science BV, 2012. - Vol. 407, Is. 3. - P.393-397. - ISSN 0921-4526, DOI 10.1016/j.physb.2011.11.004
Примечания : Cited References: 18. - This study was supported, in part, by Russian Federation's President Grant MK-497.2010.2 (A.A.D.).
Предметные рубрики: NDFE3(BO3)4
HOFE3(BO3)4
MULTIFERROICS
Ключевые слова (''Своб.индексиров.''): phase transitions--rare-earth ferroborates rfe3(bo3) 4--multiferroics
Аннотация: The magnetic properties of trigonal Nd0.9Dy0.1Fe3(BO3)4 substituted compound with the competitive Nd–Fe and Dy–Fe exchange interactions have been investigated. It has been shown that in Nd0.9Dy0.1Fe3(BO3)4 a spontaneous spin-reorientation transition from an ease-axis state to an easy-plane occurs near 8 K. Anomalies of the magnetization curves are observed in a spin-flop transition induced by the magnetic field B II c. The calculations were performed using a molecular-field approximation and a crystal-field model for the rare-earth subsystem. Extensive experimental data on the magnetic properties of Nd0.9Dy0.1Fe3(BO3)4 have been interpreted and good agreement between theory and experiment has been achieved using the obtained theoretical dependences.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Demidov A. A., Gudim, I. A., Eremin E. V.
Заглавие : Magnetic properties of Nd 0.6Dy 0.4Fe 3(BO 3) 4
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.261-264. - ISBN 9783037854365, DOI 10.4028/www.scientific.net/SSP.190.261
Ключевые слова (''Своб.индексиров.''): multiferroics--phase transitions--rare-earth ferroborates rfe 3(bo 3) 4--experimental data--magnetization curves--molecular field approximation--multiferroics--rare-earth ferroborates rfe--spin reorientation transitions--spin-flop transitions--substituted compounds--magnetic materials--magnetic properties--neodymium--phase transitions--dysprosium compounds
Аннотация: The magnetic properties of trigonal Nd 0.6Dy 0.4Fe 3(BO 3) 4 substituted compound with the competitive Nd-Fe and Dy-Fe exchange interactions have been investigated. It has been shown that in Nd 0.6Dy 0.4Fe 3(BO 3) 4a spontaneous spin-reorientation transition from an ease-axis state to an easy-plane occurs near 31 K. Anomalies of the magnetization curves are observed in a spin-flop transition induced by the magnetic field B||c. The calculations were performed using a molecularfield approximation and a crystal-field model for the rare-earth subsystem. Extensive experimental data on the magnetic properties of Nd 0.6Dy 0.4Fe 3(BO 3) 4have been interpreted and good agreement between theory and experiment has been achieved using the obtained theoretical dependences. В© (2012) Trans Tech Publications.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kadomtseva A. M., Vorob'ev G. P., Popov Y. F., Pyatakov A. P., Mukhin A. A., Ivanov V. Y., Zvezdin A. K., Gudim, Irina A., Temerov V. L., Bezmaternykh L. N.
Заглавие : Magnetoelectric and magnetoelastic properties of easy-plane ferroborates with a small ionic radius
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2012. - Vol. 114, Is. 5. - P.810-817. - ISSN 1063-7761, DOI 10.1134/S1063776112030053
Примечания : Cited References: 26. - This work was supported by the Russian Foundation for Basic Research (project nos. 10-02-00846a, 09-02-01355, and 12-02-01261).
Предметные рубрики: EARTH
HoFe3(BO3)4
DyFe3(BO3)4
RFe3(BO3)4
Аннотация: The magnetic, magnetoelectric, and magnetoelastic properties of RFe3(BO3)4 ferroborates are studied. The measurement of the field dependences of the magnetoelectric polarization along the a axis in holmium ferroborate and in the mixed composition Ho0.5Sm0.5Fe3(BO3)4 revealed the following dependences for easy-plane ferroborates: (a) the longitudinal and transverse magnetoelectric effects have the opposite signs and (b) magnetically induced polarization changes its sign in a field close to the field of exchange between rare-earth and iron ions. These dependences agree well with theoretical predictions based on the symmetry of the compounds. The relatively low f-d exchange field in holmium ferroborate (about 20 kOe), which magnetizes the rare-earth subsystem, causes smaller polarization jumps (about 30 μC/m2) in fields lower than 10 kOe as compared to the jumps in other easy-plane ferroborates (R = Sm, Nd). The increase in the electric polarization induced in HoFe3(BO3)4 in magnetic fields higher than 100 kOe (200–300 μC/m2) is found to be significantly smaller than in neodymium ferroborate, which indicates a substantial dependence of the magnetoelectric effects on the electronic structure of a rare-earth ion.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sukhachev A. L., Vasil'ev A. D., Leont'ev A. A., Kartashev A. V., Temerov V. L., Gudim, I. A.
Заглавие : Nature of optical properties of GdFe3(BO3)4 and GdFe2.1Ga0.9(BO3)4 crystals and other 3d5 antiferromagnets
Место публикации : Eur. Phys. J. B: Springer, 2012. - Vol. 85, Is. 2. - P.80. - ISSN 1434-6028, DOI 10.1140/epjb/e2012-20953-1
Примечания : Cited References: 70. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by Russian President Grant NSh-1044.2012.2.
Предметные рубрики: IRON BORATE GDFE3(BO3)4
D-D TRANSITIONS
EARTH FERROBORATES RFE3(BO3)4
ABSORPTION-SPECTRA
OCTAHEDRAL COMPLEXES
ELECTRONIC-STRUCTURE
NEEL TEMPERATURE
FINE-STRUCTURE
EXCHANGE
IONS
Аннотация: Influence of the partial substitution of paramagnetic Fe3+ ions by diamagnetic Ga3+ ions in the trigonal crystal GdFe3 (BO3)4 on its optical and magnetic properties is studied and discussed in connection with problems common for all antiferromagnets containing 3d 5 ions. Polarized optical absorption spectra and linear birefringence of GdFe3 (BO3)4 and GdFe2.1Ga0.9 (BO3)4 single crystals have been measured in the temperature range 85–293 K. Specific heat temperature dependence (2–300 K) and structure of GdFe2.1Ga0.9 (BO3)4 crystal have been also studied. As a result of substitution of 30% Fe to Ga the Neel temperature diminishes from 38 till 16 K, the strong absorption band edge shifts on 860 cm-1 (0.11 eV) to higher energy and the d-d transitions intensity decreases substantially larger than the Fe concentration does. Strong absorption band edge is shown to be due to Mott-Hubbard transitions. Correlation between position of the strong absorption band edge and the Neel temperature of antiferromagnets has been revealed. Properties of the doubly forbidden d-d transitions in the studied crystals and in other antiferromagnets are explained within the framework of the model of the exchange-vibronic pair absorption, which is theoretically analyzed in detail. The model permitted us to determine the connection between parameters of d-d absorption bands (intensity, width and their temperature dependences), on the one hand, and the exchange, spin-orbit and electron-lattice interactions, on the other hand.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Demidov A. A., Gudim, I. A., Eremin E. V.
Заглавие : Magnetic phase transitions in Nd1−xDyxFe3(BO3)4 ferroborates
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 114, Is. 2. - P.259-272. - ISSN 1063-7761, DOI 10.1134/S1063776111160023
Примечания : Cited References: 29. - This study was supported financially by the President of the Russian Federation (grant no. MK-497.2010.2).
Предметные рубрики: SPIN REORIENTATION
CRYSTAL
DY
ND
Аннотация: The magnetic properties of ferroborate single crystals with substituted compositions Nd1−xDyxFe3(BO3)4 (x = 0.15, 0.25) with competing exchange Nd-Fe and Dy-Fe interactions are investigated. For each composition, we observed a spontaneous spin-reorientation transition from the easy-axis to the easy-plane state and step anomalies on the magnetization curves for the spin-flop transition induced by a magnetic field B | c. The measured parameters and effects are interpreted using a unified theoretical approach based on the molecular field approximation and on calculations performed in the crystal-field model for the rare-earth ion. The experimental temperature dependences of the initial magnetic susceptibility from T = 2 K to T = 300 K, anomalies on the magnetization curves for B | c in fields up to 1.8 T, and their evolution with temperature, as well as temperature and field dependences of magnetization in fields up to 9 T are described. In the interpretation of experimental data, the crystal-field parameters in trigonal symmetry for the rare-earth subsystem are determined, as well as the parameters of Nd-Fe and Dy-Fe exchange interactions.
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19.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sukhachev A. L., Malakhovskii A. V., Kutsak T. V., Strokova A. Yu., Sokolov A. E., Temerov V. L., Gudim, I. A.
Заглавие : Magneto-optical activity of f-f transitions in trigonal alumo- and ferroborates
Коллективы : International Feofilov symposium on spectroscopy of crystals doped with rare earth and transition metal ions
Место публикации : XV Int. Feofilov symp. on spectroscopy of crystals doped with rare earth and transition metal ions. - Kazan, 2013. - P.113
Аннотация: Представлены результаты изучения спектров поглощения и магнитного кругового дихроизма и магнитооптической активности (МОА) f-f переходов в кристаллах DyFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, ErAl3(BO3)4, TmAl3(BO3)4, YbAl3(BO3)4. Обнаружено, что МОА большинства переходов не следует закону Кюри-Вейсса. Это явление объяснено теоретически.
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Sukhachev A. L., Sokolov A. E., Temerov V. L., Gudim, I. A.
Заглавие : Influence of f-f electron transitions on the local properties in vicinity of the excited ions in trigonal alumo- and ferroborates
Коллективы : International Feofilov symposium on spectroscopy of crystals doped with rare earth and transition metal ions (15; 2013 ; Sept. ; 16-20; Казань)
Место публикации : XV Int. Feofilov symp. on spectroscopy of crystals doped with rare earth and transition metal ions. - Kazan, 2013. - Ст.PI_4. - P.112
Аннотация: Представлены результаты изучения спектров поглощения кристаллов TbFe3(BO3)4, TmAl3(BO3)4, YbAl3(BO3)4, DyFe3(BO3)4 и Nd0.5Gd0.5Fe3(BO3)4. Показано, что геометрия локального окружения и локальные магнитные свойства могут меняться в процессе f-f электронных переходов.
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