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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S., Gerasimova J. V., Ershov A. A., Krylov A. S., Shaykhutdinov K. A., Vtyurin A. N., Molokeev M. S., Terent'ev K. Yu., Mikhashenok N. V.
Заглавие : Raman spectra and phase composition of MnGeO3 crystals
Коллективы : RFBR [13-02-00825]; Ministry of Science and Education of the Russian Federation
Место публикации : J. Raman Spectrosc.: Wiley-Blackwell, 2016. - Vol. 47, Is. 5. - P.531-536. - ISSN 0377-0486, DOI 10.1002/jrs.4816. - ISSN 1097-4555(eISSN)
Примечания : Cited References:21. - The work was partially supported by the RFBR through grants no. 13-02-00825.; O.A.S. and K.A.S. are partially supported by the Ministry of Science and Education of the Russian Federation.
Предметные рубрики: TENSOR ANALYSIS
SINGLE-CRYSTAL
POLYCRYSTALLINE
SPECTROSCOPY
PYROXENE
Ключевые слова (''Своб.индексиров.''): raman spectroscopy--lattice dynamics--raman tensor analysis--orthopyroxene--clinopyroxene
Аннотация: MnGeO3 single-crystal samples have been synthesized by optical zonal melting and spontaneous crystallization. X-ray crystal analysis showed the first sample to be a two-phase one with phase ratio as follows: 17% - monoclinic C2/c, and 83% - orthorhombic Pbca; the phase ratio of the second sample was unknown. Raman spectra have been produced for these samples. Lattice dynamics has been simulated and polarization dependencies of lines' intensities have been analyzed to interpret experimental Raman spectra and to attribute lines to the spectra of monoclinic and orthorhombic phases. Copyright (C) 2015 John Wiley & Sons, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Petrakovskii G. A., Kartashev A., Eremin E. V., Temerov V. L.
Заглавие : Low-temperature magnetic phase diagram of HoFe3(BO3)(4) holmium ferroborate: a magnetic and heat capacity study
Разночтения заглавия :авие SCOPUS: Low-temperature magnetic phase diagram of HoFe3(BO 3)4 holmium ferroborate: A magnetic and heat capacity study
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2009. - Vol. 21, Is. 43. - Ст.436001. - ISSN 0953-8984, DOI 10.1088/0953-8984/21/43/436001
Примечания : Cited References: 20
Предметные рубрики: SINGLE-CRYSTAL
DYFE3(BO3)(4)
ND3+
Ключевые слова (''Своб.индексиров.''): antiferromagnetic state--applied magnetic fields--characteristic temperature--crystal axis--heat capacities--low temperatures--magnetic field parallel--magnetic phase diagrams--magnetic phase transitions--magnetization jump--schottky anomaly--spin reorientation transitions--thermal measurements--antiferromagnetic materials--antiferromagnetism--holmium--magnetic fields--phase diagrams--single crystals--specific heat--phase transitions
Аннотация: We present the results of the magnetic and heat capacity study of a magnetic phase diagram of a HoFe3(BO3)(4) single crystal. Two magnetic phase transitions are found in the low-temperature region. The transition from the paramagnetic to easy-plane antiferromagnetic state occurs at T-N = 37.4 K and is independent of an applied magnetic field. The sharp heat capacity peaks and magnetization jumps corresponding to the spontaneous and field-induced spin-reorientation transitions between the easy-axis and easy-plane states are observed below 4.7 K. Also, the additional heat capacity peaks, which can be attributed to the Schottky anomalies with the field-dependent characteristic temperatures, are found. According to the magnetic and thermal measurement data, the magnetic phase diagrams of HoFe3(BO3)(4) for the magnetic field parallel and perpendicular to the crystal axis are constructed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Svistov L. E., Chubarenko V. A., Shapiro A. Y., Zalesskii A. V., Petrakovskii G. A.
Заглавие : Antiferromagnetic resonance in Bi2CuO4
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 1998. - Vol. 86, Is. 6. - P1228-1233. - ISSN 1063-7761, DOI 10.1134/1.558595
Примечания : Cited References: 14
Предметные рубрики: SINGLE-CRYSTAL
RANGE
Аннотация: Magnetic resonance of the low-frequency spin-wave branch in the Bi2CuO4 antiferromagnet with an easy-plane anisotropy has been studied. Angular, frequency, and temperature dependences of the position and width of the antiferromagnetic resonance (AFMR) line have been measured. Our measurements combined with earlier data [H. Ochta, K. Yoshida, T. Matsuya, T. Nanba, M. Motokawa, K. Yamada, Y. Endon, and S. Hosoya, J. Phys. Sec. Jpn. 61, 2921 (1992); E. W. Ong, G. H. Kwei, R. A. Robinson, B. L. Ramakrishna, and R. B. von Dreele, Phys. Rev. B 42, 4255 (1990)] have allowed us to determine anisotropy constants of this material and to account for the unusual character of its static susceptibility anisotropy. The AFMR line shifts to the high-field side and broadens in a temperature range of 10-15 K, and the cause of this has remained unclear. In the low-temperature range the line shows a hysteresis corresponding to a static field magnitude several times as large as the spin-flop field. The position and width of the AFMR line depend sensitively on the sample preparation technique. (C) 1998 American Institute of Physics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : PANKRATS A. I., PETRAKOVSKII G. A., SABLINA K. A.
Заглавие : MICROWAVE RESONANCE-ABSORPTION IN ANTIFERROMAGNET BI2CUO4
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 1994. - Vol. 91, Is. 2. - P121-124. - ISSN 0038-1098, DOI 10.1016/0038-1098(94)90267-4
Примечания : Cited References: 13
Предметные рубрики: SINGLE-CRYSTAL
NEUTRON-SCATTERING
RANGE
Аннотация: The resonance absorption in Bi2CuO4 single crystals was found in the frequency range 35-80 GHz for H(perpendicular-to)C4 Case and it was absent for H(parallel-to)C4 case. The frequency-field dependence for H(perpendicular-to)C4 case at 4.2 K is typical for easy-plane antiferromagnets with weak magnetic anisotropy in this plane. In contrast to the sublattice magnetization of Bi2CuO4 the resonance parameters depend strongly on the temperature below 20 K. Besides, the resonance field has a considerable jump at TN which ls not typical for second order phase transitions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moiseenko E. T., Altunin R. R., Zharkov S. M.
Заглавие : Formation of the atomically ordered L10 structure with the [001] orientation during the solid-state reaction in Fe/Pd bilayer thin films
Коллективы : Russian Foundation for Basic Research [14-03-00515, 16-32-00225, 16-38-60075]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 6. - P.1233-1237. - ISSN 1063-7834, DOI 10.1134/S1063783417060154. - ISSN 1090-6460(eISSN)
Примечания : Cited References:21. - This study was supported by the Russian Foundation for Basic Research, projects nos. 14-03-00515, 16-32-00225, and 16-38-60075.
Предметные рубрики: MAGNETIC-FIELD
SINGLE-CRYSTAL
FEPT FILMS
Аннотация: The formation of the atomically ordered L10-FePd structure during the solid-state reaction in Fe/Pd bilayer thin films is in situ investigated by electron microscopy and electron diffraction analysis. The initial iron and palladium layers were mainly coherently oriented crystallites with the orientation relationship α-Fe (001)[110] || Pd(001)[100]. It is established that the solid-state reaction between the iron and palladium layers upon heating at a rate of 4–8°C/min starts with the formation of the FePd solid solution at 390°C; at 430°C, the formation of the atomically ordered L10-FePd structure is observed. It is shown that at the low heating rate (4–8°C/min), the L10-FePd structure with the [001] orientation relative to the film plane forms, while at the high heating rate (50°C/min) it forms with the [100], [010], and [001] orientations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Bovina A. F., Molokeev M. S., Krylov A. S., Shabanov A. V., Chernyshov A. V., Sofronova S. N.
Заглавие : Study of flux crystal growth peculiarities, structure and Raman spectra of double (Mn,Ni)3BO5 and triple (Mn,Ni,Cu)3BO5 oxyborates with ludwigite structure
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk Krai; Krasnoyarsk Territorial Foundation for Support of Scientific and RD Activities [20-42-240011]
Место публикации : CrystEngComm. - 2021. - Vol. 23, Is. 33. - P.5624-5635. - ISSN 1466-8033(eISSN), DOI 10.1039/d1ce00750e
Примечания : Cited References: 32. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Krai, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 20-42-240011. X-ray and EDX data were obtained with the use of the analytical equipment of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS"
Предметные рубрики: MAGNETIC-PROPERTIES
SINGLE-CRYSTAL
Аннотация: Crystallization of heterovalent double (Mn,Ni)3BO5 and triple (Mn,Ni,Cu)3BO5 oxyborates with the ludwigite structure is studied in fluxes based on Bi2Mo3O12 diluted with Na2CO3 or Li2CO3 carbonates. Single crystals of five (Mn,Ni)3BO5 and three (Mn,Ni,Cu)3BO5 compounds with different cation ratios are obtained. The ion concentration is determined from the analysis of the lattice parameters by powder and single crystal XRD. The comparative analysis of the polarized Raman spectra of double and triple ludwigites is presented. The actual high nickel and small copper concentrations in the crystals are discussed. The hierarchy of chemical bonds in the fluxes used in addition to the approach involving stabilization of the manganese valence state using solvent components is estimated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Malakhovskii A. V., Ovchinnikov S. G.
Заглавие : Effect of optical f - f excitations on the Nd-Fe exchange interaction in Nd ferroborate with multiferroic properties
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [19-02-00034]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Krasnoyarsk Regional Fund of Science [20-42-240016]; Government of Krasnoyarsk Territory
Место публикации : Phys. Rev. B. - 2021. - Vol. 104, Is. 6. - Ст.064445. - ISSN 2469-9950, DOI 10.1103/PhysRevB.104.064445. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 28. - The reported study was supported by the RFBR Grant 19-02-00034. V.A.G. is also grateful to the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science according to the research project "Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials" No. 20-42-240016
Предметные рубрики: LOCAL MAGNETIC-PROPERTIES
SINGLE-CRYSTAL
EXCITED-STATES
Аннотация: We considered the effect of optical pumping at the f−f transitions frequency on d−f superexchange in the rare-earth antiferromagnetic ferroborate Nd0.5Gd0.5Fe3(BO3)4 between Nd3+ ions in the excited states of the 4G5/2, 2G7/2, and Fe3+ in the ground state 6A1. In the ferroborate, d−f superexchange is directly related to the strong magnetoelectric coupling observed in the ground state of the material. We show that under optical pumping at the frequency of f−f transitions 4I9/2↔(4G5/2+2G7/2) in the Nd3+ ion, the nature of the d−f interaction changes to FM. The phenomena can be explained by the occupation of the excited Nd3+ “spin pure” states with spin 1/2, or their mixing to the optically excited states with spin 3/2 due to the spin-orbit interaction. Near optically excited ions Nd3+, magnetic frustrations change from FM ordering under the d−f AFM interaction to AFM ordering under the FM interaction in the basal hexagonal plane.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platunov M. S., Gudim I. A., Ovchinnikova, Elena N., Kozlovskaya, Ksenia A., Wilhelm, Fabrice, Rogalev, Andrei, Hen, Amir, Ivanov, Vsevolod Y., Mukhin, Alexander A., Dmitrienko, Vladimir E.
Заглавие : X-ray Natural Circular Dichroism imaging of multiferroic crystals
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-72-00002, 16-12-10531]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-12029, 19-02-00483]; Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC "Crystallography and Photonics" RAS
Место публикации : Crystals. - 2021. - Vol. 11, Is. 5. - Ст.531. - ISSN 2073-4352, DOI 10.3390/cryst11050531
Примечания : Cited References: 70. - This research was funded by the Russian Science Foundation (grant 19-72-00002). K.A.K. acknowledges support from the Russian Foundation for Basic Research (project no. 19-52-12029 and project no. 19-02-00483). V.E.D. was partly supported by the Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC "Crystallography and Photonics" RAS. V.Y.I. and A.A.M. were supported by the Russian Science Foundation [grant 16-12-10531]
Предметные рубрики: OPTICAL-ACTIVITY
MAGNETOELASTIC PROPERTIES
SINGLE-CRYSTAL
Аннотация: The polarizing spectroscopy techniques in visible range optics have been used since the beginning of the 20th century to study the anisotropy of crystals based on birefringence and optical activity phenomena. On the other hand, the phenomenon of X-ray optical activity has been demonstrated only relatively recently. It is a selective probe for the element-specific properties of individual atoms in non-centrosymmetric materials. We report the X-ray Natural Circular Dichroism (XNCD) imaging technique which enables spatially resolved mapping of X-ray optical activity in non-centrosymmetric materials. As an example, we present the results of combining micro-focusing X-ray optics with circularly polarized hard X-rays to make a map of enantiomorphous twinning in a multiferroic SmFe3(BO3)4 crystal. Our results demonstrate the utility and potential of polarization-contrast imaging with XNCD as a sensitive technique for multiferroic crystals where the local enantiomorphous properties are especially important. In perspective, this brings a novel high-performance method for the characterization of structural changes associated with phase transitions and identification of the size and spatial distribution of twin domains.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pavlovskiy M. S., Shaykhutdinov K. A., Wu L. S., Ehlers G., Temerov V. L., Gudim I. A., Shinkorenko A. S., Podlesnyak A.
Заглавие : Observation of soft phonon mode in TbFe3(BO3)4 by inelastic neutron scattering
Коллективы : Laboratory Directed Research and Development Program of Oak Ridge National Laboratory; RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-243039]
Место публикации : Phys. Rev. B. - 2018. - Vol. 97, Is. 5. - Ст.054313. - ISSN 2469-9950, DOI 10.1103/PhysRevB.97.054313. - ISSN 2469-9969(eISSN)
Примечания : Cited References:40. - This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. L.S.W. was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US DOE. The work was funded by RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund according to Research Project No. 16-42-243039.
Предметные рубрики: STRUCTURAL PHASE-TRANSITIONS
SINGLE-CRYSTAL
SPECTROSCOPY
Аннотация: The phonon dispersion in terbium iron borate TbFe3(BO3)4 has been measured by inelastic neutron scattering in a temperature range 180˂T˂350 K through the displacive structural transition at TS=192.5K and studied by ab initio calculations. Significant, but not complete, softening of the transverse acoustic (TA) branch has been observed at the corner of the Brillouin zone (Λ point) at temperatures T⪆TS, in full agreement with theoretical calculations. The TA soft mode undergoes considerable broadening at the Λ point near the transition temperature that can be attributed to the anharmonic interference between transverse acoustic and optical modes.
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