Библиотека института физики им. Л.В. Киренского СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova E. A., Tristan N., Vasiliev A. N., Temerov V. L., Bezmaternykh L. N., Leps N., Buechner B., Klingeler R.
Заглавие : Magnetization and specific heat of DyFe3(BO3)(4) single crystal
Разночтения заглавия :авие SCOPUS: Magnetization and specific heat of DyFe 3(BO 3) 4 single crystal
Место публикации : Eur. Phys. J. B: SPRINGER, 2008. - Vol. 62, Is. 2. - P123-128. - ISSN 1434-6028, DOI 10.1140/epjb/e2008-00146-5
Примечания : Cited References: 18
Предметные рубрики: IRON
NDFE3(BO3)(4)
GDFE3(BO3)(4)
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stanislavchuk T. N., Chukalina E. P., Popova M. N., Bezmaternykh L. N., Gudim I. A.
Заглавие : Investigation of the iron borates DyFe3(BO3)(4) and HoFe3(BO3)(4) by the method of Er3+ spectroscopic probe
Разночтения заглавия :авие SCOPUS: Investigation of the iron borates DyFe3(BO3)4 and HoFe3(BO3)4 by the method of Er3+ spectroscopic probe
Место публикации : Phys. Lett. A: ELSEVIER SCIENCE BV, 2007. - Vol. 368, Is. 5. - P408-411. - ISSN 0375-9601, DOI 10.1016/j.physleta.2007.04.044
Примечания : Cited References: 16
Предметные рубрики: GDFE3(BO3)(4)
CRYSTALS
Ключевые слова (''Своб.индексиров.''): 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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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) : Popova E. A., Vasiliev A. N., Temerov V. L., Bezmaternykh L. N., Tristan N., Klingeler R., Buchner B.
Заглавие : Magnetic and specific heat properties of YFe3(BO3)(4) and ErFe3(BO3)(4)
Коллективы :
Разночтения заглавия :авие SCOPUS: Magnetic and specific heat properties of YFe3(BO3) 4 and ErFe3(BO3)4
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2010. - Vol. 22, Is. 11. - Ст.116006. - ISSN 0953-8984, DOI 10.1088/0953-8984/22/11/116006
Примечания : 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.
Предметные рубрики: LINEAR-CHAIN ANTIFERROMAGNETISM
CRYSTAL-STRUCTURE
GDFE3(BO3)(4)
MULTIFERROICS
BA2COS3
ORDER
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ritter C., Vorotynov A. M., Pankrats A. I., Petrakovskii G. A., Temerov V. L., Gudim, I. A., Szymczak R.
Заглавие : Magnetic structure in iron borates RFe(3)(BO(3))(4)(R= Y, Ho): a neutron diffraction and magnetization study
Коллективы :
Разночтения заглавия :авие SCOPUS: Magnetic structure in iron borates RFe3(BO3) 4(R = Y,Ho): A neutron diffraction and magnetization study
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2008. - Vol. 20, Is. 36. - Ст.365209. - ISSN 0953-8984, DOI 10.1088/0953-8984/20/36/365209
Примечания : Cited References: 16. - This work was supported by RFBR, grant no. 06-02-16255.
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavriliuk A. G., Struzhkin V. V., Lyubutin I. S., Ovchinnikov S. G., Hu M. Y., Chow P.
Заглавие : Another mechanism for the insulator-metal transition observed in Mott insulators
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2008. - Vol. 77, Is. 15. - Ст.155112. - ISSN 1098-0121, DOI 10.1103/PhysRevB.77.155112
Примечания : Cited References: 26
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zvezdin A. K., Vorob'ev G. P., Kadomtseva A. M., Popov Y. F., Pyatakov A. P., Bezmaternykh L. N., Kuvardin A. V., Popova E. A.
Заглавие : Magnetoelectric and magnetoelastic interactions in NdFe3(BO3)(4) multiferroics
Разночтения заглавия :авие SCOPUS: Magnetoelectric and magnetoelastic interactions in NdFe3(BO 3)4 multiferroics
Место публикации : JETP Letters. - 2006. - Vol. 83, Is. 11. - P.509-514. - ISSN 0021-3640, DOI 10.1134/S0021364006110099
Примечания : 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).
Предметные 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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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) : Popova M. N., Stanislavchuk T. N., Malkin B. Z., Bezmaternykh L. N.
Заглавие : Breaking of the Selection Rules for Optical Transitions in the Dielectric PrFe3(BO3)(4) Crystal by a Praseodymium-Iron Exchange Interaction
Коллективы : RFBR [07-02-01185, 07-02-00704]; Russian Academy of Sciences
Разночтения заглавия :авие SCOPUS: Breaking of the selection rules for optical transitions in the dielectric PrFe3(BO3)4 crystal by a praseodymium-iron exchange interaction
Место публикации : Phys. Rev. Lett.: AMER PHYSICAL SOC, 2009. - Vol. 102, Is. 18. - Ст.187403. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.102.187403
Примечания : 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.
Предметные рубрики: SINGLE-CRYSTAL
GDFE3(BO3)(4)
PHASE
DYFE3(BO3)(4)
SPECTRUM
LINES
Ключевые слова (''Своб.индексиров.''): 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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova E. A., Volkov D. V., Vasiliev A. N., Demidov A. A., Kolmakova N. P., Gudim I. A., Bezmaternykh L. N., Tristan N., Skourski Y., Buchner B., Hess C., Klingeler R.
Заглавие : Magnetization and specific heat of TbFe3(BO3)(4): Experiment and crystal-field calculations
Разночтения заглавия :авие SCOPUS: Magnetization and specific heat of Tb Fe3 (B O3) 4: Experiment and crystal-field calculations
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2007. - Vol. 75, Is. 22. - Ст.224413. - ISSN 1098-0121, DOI 10.1103/PhysRevB.75.224413
Примечания : Cited References: 22
Предметные 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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