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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Frolov K. V., Lyubutin I. S., Smirnova E. S., Alekseeva O. A., Verin I. A., Artemov V. V., Kharlamova S. A., Bezmaternykh L. N., Gudim, I. A.
Заглавие : Low-temperature structural and magnetic phase transitions in multiferroic GdFe3(BO3)4
Коллективы : Russian Foundation for Basic Research [14-02-00483a, 13-02-12442]; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools [NSh-1130.2014.5, NSh-924.2014.2]; Russian Ministry of Education and Science [RFMEFI62114X0005]
Место публикации : J. Alloys Compd.: Elsevier Science, 2016. - Vol. 671. - P.545-551. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2016.02.083. - ISSN 1873-4669(eISSN)
Примечания : Cited References:36. - We thank Dr. A.P. Dudka for help in the low temperature XRD measurements. This study was supported in part by the Russian Foundation for Basic Research (projects # 14-02-00483a and 13-02-12442), and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (grant # NSh-1130.2014.5 and # NSh-924.2014.2). This work was performed using the equipment of the Shared Research Center IC RAS and was supported by the Russian Ministry of Education and Science (project RFMEFI62114X0005).
Предметные рубрики: IRON BORATE GDFE3(BO3)4
BIFEO3 THIN-FILMS
MAGNETOELASTIC PROPERTIES
RM3(BO3)4 CRYSTALS
TRIGONAL GDFE3(BO3)4
ENHANCED POLARIZATION
HIGH-PRESSURES
CRYSTALLIZATION
BEHAVIOR
GROWTH
Ключевые слова (''Своб.индексиров.''): multiferroics--rare earth compounds--x-ray diffraction--mossbauer--spectroscopy--crystal structure--spin dynamics
Аннотация: X-ray analysis revealed that at temperature decreasing from room temperature to Tstr = 155 K the crystal unit cell GdFe3(BO3)4 is reduced only along the c axis (at 0.01 Å), while the a and b axes are unchanged within the error limits. The volume of the crystal decreases uniformly in the direction of all three axes at 155–80 K. At 80–30 K the crystal volume is decreased only by reduction of the parameters a and b, while the parameter c increases conversely. In the paramagnetic region Mössbauer spectra do not distinguish between the two structural positions of iron ions Fe1 and Fe2, appearing at T < Tstr. Below the temperature of the magnetic phase transition at TN = 38.0(1) K the Mössbauer data indicate quasi-one-dimensional magnetic ordering of iron moments in the sublattice Fe2 and a two-dimensional one in the iron sublattice Fe1. The dynamics of spin reorientation in sublattices Fe1 and Fe2 is studied in detail.Рентгеновский анализ показал, что при уменьшении температуры от комнатной до Tstr = 155 K изменение параметра элементарной ячейки кристалла GdFe3(BO3)4 происходит лишь вдоль оси с (при 0,01 Å), в то время как а и b оси остаются неизменными в пределах погрешности измерений. Объем кристалла уменьшается равномерно в направлении всех трех осей при 155-80 K. При 80-30 K объем кристалла уменьшается только уменьшением параметров a и b, в то время как параметр с наоборот увеличивается. В парамагнитной области Мессбауэровские спектры не различают двух структурных позиций ионов железа Fe1 и Fe2, появляющиеся при Т˂Tstr. Ниже температуры магнитного фазового перехода при TN = 38,0(1) К Мёссбауэрские данные указывают на квази-одномерный магнитное упорядочение моментов железа в подрешетке Fe2 и двумерное в железной подрешетке Fe1. Динамика спиновой переориентации в подрешетках Fe1 и Fe2 подробно изучается.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Chukalina E. P., Stanislavchuk T. N., Malkin B. Z., Zakirov A. R., Antic-Fidancev E., Popova E. A., Bezmaternykh L. N., Temerov V. L.
Заглавие : Optical spectra, crystal-field parameters, and magnetic susceptibility of multiferroic NdFe3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Optical spectra, crystal-field parameters, and magnetic susceptibility of multiferroic Nd Fe3 (B O3) 4
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2007. - Vol. 75, Is. 22. - Ст.224435. - ISSN 1098-0121, DOI 10.1103/PhysRevB.75.224435
Примечания : Cited References: 22
Предметные рубрики: IRON BORATE GDFE3(BO3)(4)
CRYSTALLIZATION
SPECTROSCOPY
LASER
ND3+
Аннотация: We report high-resolution optical absorption spectra for NdFe3(BO3)(4) trigonal single crystal, which is known to exhibit a giant magnetoelectric effect below the temperature of magnetic ordering T-N=33 K. The analysis of the temperature-dependent polarized spectra reveals the energies and, in some cases, symmetries and exchange splittings of Nd3+ 84 Kramers doublets. We perform crystal-field calculations starting from the exchange-charge model, obtain a set of six real crystal-field parameters, and calculate wave functions and magnetic g factors. In particular, the values g(perpendicular to)=2.385 and g(parallel to)=1.376 were found for the Nd3+ ground-state doublet. We obtain B-loc=7.88 T and parallel to J(FN)parallel to=0.48 K for the values of the local effective magnetic field at liquid-helium temperatures at the Nd3+ site and the Nd-Fe exchange integral, respectively, using the experimentally measured Nd3+ ground-state splitting of 8.8 cm(-1). To check the reliability of our set of crystal-field parameters, we model the magnetic susceptibility data from literature. A dimer containing two nearest-neighbor iron ions in the spiral chain is considered to partly account for quasi-one-dimensional properties of iron borates, and then the mean-field approximation is used. The results of calculations with the exchange parameters for Fe3+ ions J(nn)=-6.25 K (intrachain interactions) and J(nnn)=-1.92 K (interchain interactions) obtained from fitting agree well with the experimental data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Bykova L. E., Bondarenko G. N.
Заглавие : Multiple self-propagating high-temperature synthesis and solid-phase reactions in thin films
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 1999. - Vol. 88, Is. 5. - P963-967. - ISSN 1063-7761, DOI 10.1134/1.558878
Примечания : Cited References: 28
Предметные рубрики: DENSE BRANCHING MORPHOLOGY
SINGLE-CRYSTAL GROWTH
PATTERN-FORMATION
AL-GE
CHEMICAL-REACTIONS
CRYSTALLIZATION
SEPARATION
HEAT
Аннотация: A variety of self-propagating high-temperature synthesis in thin films has been found and investigated. This modification, called multiple self-propagating high-temperature synthesis, occurs in the solid phase and is a reversible phase transition. Multiple self-propagating high-temperature synthesis is similar in many respects to a metal-insulator phase transition. It is shown that for eutectic systems it is equivalent to a repeated transition through the eutectic temperature of bulk samples. It is inferred that multiple self-propagating high-temperature synthesis in bilayer films is governed by phase separation mechanisms that take place during eutectic solidification and eutectoid decomposition. (C) 1999 American Institute of Physics. [S1063-7761(99)01705-9].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fausti D., Nugroho A. A., van Loosdrecht PHM, Klimin S. A., Popova M. N., Bezmaternykh L. N.
Заглавие : Raman scattering from phonons and magnons in RFe3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Raman scattering from phonons and magnons in RFe3 (BO3) 4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2006. - Vol. 74, Is. 2. - Ст.24403. - ISSN 1098-0121, DOI 10.1103/PhysRevB.74.024403
Примечания : Cited References: 26
Предметные рубрики: IRON BORATE GDFE3(BO3)(4)
LIGHT-SCATTERING
CRYSTALS
ND
CRYSTALLIZATION
TRANSITIONS
GENERATION
LASER
Аннотация: Inelastic light scattering spectra of several members of the RFe3(BO3)(4) family reveal a cascade of phase transitions as a function of temperature, starting with a structural, weakly first-order, phase transition followed by two magnetic phase transitions. Those consist of the ordering of the Fe-spin sublattice, revealed by all the compounds, and a subsequent spin-reorientational transition for GdFe3(BO3)(4). The Raman data evidence a strong coupling between the lattice and magnetic degrees of freedom in these borates. The Fe-sublattice ordering leads to a strong suppression of the low-energy magnetic scattering, and a multiple peaked two-magnon scattering continuum is observed. Evidence for short-range correlations is found in the "paramagnetic" phase by the observation of a broad magnetic continuum in the Raman data, which persists up to surprisingly high temperatures.
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