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

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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova O. S., Ivantsov R. D., Edelman I. S., Petrakovskaja E. A.
Заглавие : A comparative study of γ-Fe2O3 and ε-Fe2O3 nanoparticles arising in borate glasses doped with Fe and Gd
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P9.11. - P.397. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 1. - The work was supported partly by the RFBR grant No. 14-02-01211
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--magnetic circular dichroism--magnetic measurements
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova O. S., Ivantsov R. D., Edelman I. S., Petrakovskaja E. A.
Заглавие : A comparative study of γ-Fe2O3 and ε-Fe2O3 nanoparticles arising in borate glasses doped with Fe and Gd
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2016. - Vol. 9, Is. 4. - P.459–462. - ISSN 1997-1397, DOI 10.17516/1997-1397-2016-9-4-459-462; Журн. СФУ. Сер. "Математика и физика"
Примечания : Cited References: 6. - The work was supported partly by the RFBR, 14-02-01211-a, and by the President of Russia Grant NSh-7559.2016.2.
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--magnetic circular dichroism--magnetic measurements--магнитные наночастицы--магнитный круговой дихроизм--магнитные измерения
Аннотация: Formation and properties of the iron oxides γ -Fe2O3 and ϵ-Fe2O3 nanoparticles arising in glasses of basic compositions Ge2O-K2O-Al2O3-B2O3 and K2O-Al2O3-B2O3 doped with different concentrations of Fe2O3 and Gd2O3 and subjected to the additional thermal treatment are studied. The X-ray diffraction, TEM microscopy, magnetooptical effects, and electron spin resonance study allow elucidating the matrix and Gd role in determining the nanoparticle properties.Изучены свойства наночастиц γ-Fe2O3 и ϵ-Fe2O3, формирующихся в стеклах основного состава Ge2O-K2O-Al2O3-B2O3 и K2O-Al2O3-B2O3, допированных Fe2O3 и Gd2O3 и подвергнутых дополни- тельной термической обработке. Результаты исследования рентгеновской дифракции, электрон- ной микроскопии, магнитооптических эффектов и электронного спинового резонанса позволили объяснить роль матрицы и гадолиния в определении свойств наночастиц.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Burkova L. V., Seredkin V. A., Yakovchuk V. Y.
Заглавие : An analysis of the mechanism of Kerr effect enhancement in Mn/Dy/Bi
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1999. - Vol. 41, Is. 1. - P80-86. - ISSN 1063-7834, DOI 10.1134/1.1130733
Примечания : Cited References: 35
Предметные рубрики: ELECTRONIC-STRUCTURE
THIN-FILMS
MAGNETIC-PROPERTIES
RARE-EARTH
MAGNETOOPTICAL PROPERTIES
MNBI FILMS
STABILITY
GD
Аннотация: A study is reported of the structural, magnetic, and magneto-optic properties of Mn/Dy/Bi films obtained by multilayer technology. The maximum Kerr rotation angle in such films is shown to be theta(k) = 2.25 degrees. Possible reasons for such a large Kerr effect enhancement are considered, namely, an increase in the 6p - 3d transition probability caused by symmetry distortion, polarization of the Bi6p band, and a change in the density of states near the Fermi level. The latter reason has been analyzed by simulating the electronic structure of Mn/Dy/Bi through superposition of Dy levels on the MnBi band structure. This approach has revealed possible additional transitions which may be induced by the presence of a Dy buffer and could contribute to the Kerr magneto-optic effect. (C) 1999 American Institute of Physics. [S1063=7834(99)02001-8].
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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., Temerov V. L.
Заглавие : Change of the local magnetic properties during f-f transitions in multiferroic Nd0.5Gd0.5Fe3(BO3)4 single crystal
Коллективы : Ultrafast Magnetism Conference
Место публикации : Ultrafast magnetism conf. (UMC 2015): program. - Nijmegen, 2015
Материалы конференции
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Temerov V. L.
Заглавие : Changes of the local magnetic properties of the optically excited Nd3+ ions and their manifestation in the near IR spectra of the Nd0.5Gd0.5Fe3(BO3)4 crystal
Коллективы : Russian Foundation [16-02-00273]; [Nsh-2886.2014.2]
Место публикации : Opt. Mater.: Elsevier Science, 2016. - Vol. 52. - P.126-133. - ISSN 0925-3467, DOI 10.1016/j.optmat.2015.12.029. - ISSN 1873-1252(eISSN)
Примечания : Cited References: 29. - The work was supported by the Russian Foundation for Basic Researches Grant 16-02-00273 and by the President of Russia Grant No. Nsh-2886.2014.2.
Предметные рубрики: SINGLE-CRYSTAL
GdFe3(BO3)4
STATES
Ключевые слова (''Своб.индексиров.''): f-f transitions--nd3+ ion--excited states--local magnetic properties
Аннотация: Polarized absorption spectra of f–f transitions 4I9/2 → 4F3/2 and (2H9/2 + 4F5/2) in the Nd3+ ion in the Nd0.5Gd0.5Fe3(BO3)4 single crystal were studied as a function of temperature in the range of 2–40 K and as a function of magnetic field in the range of 0–65 kOe at 2 K. It was found out that the selection rules for f–f electron transitions substantially changed in the magnetically ordered state of the crystal, and they strongly depended on the orientation of the Fe and Nd ions magnetic moments relative to the light polarization. The splitting of the ground and excited states of the Nd3+ ion in the exchange field of the Fe sublattice were determined. It was revealed that the value of the exchange splitting (the exchange interaction) in the excited states did not correlate with the theoretical Landé factors. The Landé factors of the excited states were experimentally found. In general, the local magnetic properties in the vicinity of the excited ion depend substantially on its electron state. In particular: (1) in one of the excited states a weak ferromagnetic moment appears, (2) the changes of type of the local magnetic anisotropy take place in some excited states, and (3) in some excited states the energetically favorable orientation of the Nd3+ ion magnetic moment is opposite to that in the ground state. In some excited states the nonequivalent Nd3+ centers were found out.Поляризованные спектры поглощения F-е переходов 4I9/2 → 4F3/2 и (2H9/2 + 4F5/2) в иона Nd3+ в Nd0.5Gd0.5Fe3(BO3)4 монокристалл изучались как функции температуры в интервале 2-40 K и в зависимости от магнитного поля в диапазоне 0-65 кЭ при 2 К. Выяснилось, что Правила отбора для F-F электронных переходов существенно изменился в магнитно-упорядоченном состоянии кристалла, и они сильно зависели от ориентации магнитных моментов ионов Fe и Nd по отношению к поляризация света. Расщепление основного и возбужденного состояний иона Nd3+ в обменном поле подрешетки Fe были определены. Было выявлено, что величина обменного расщепления (обменное взаимодействие) в возбужденных состояниях не коррелируют с теоретическими факторами Ланде. Факторы Ланде возбужденных состояний были найдены экспериментально. В целом, локальные магнитные свойства в непосредственной близости от возбужденного иона существенно зависят от его электронного состояния. В частности: (1) в одном из возбужденной состояния появляется слабый ферромагнитный момент, (2) изменения типа локальных магнитной анизотропии происходит в некоторых возбужденных состояниях, и (3) в некоторых возбужденных состояниях энергетически благоприятных ориентация иона Nd3+ магнитного момента противоположны тем, что в основном состоянии. В некоторых возбужденных состояниях были обнаружены неэквивалентные центры Nd3+.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ji, Haipeng, Huang, Zhaohui, Xia, Zhiguo, Molokeev M. S., Jiang, Xingxing, Lin, Zheshuai, Atuchin V. V.
Заглавие : Comparative investigations of the crystal structure and photoluminescence property of eulytite-type Ba3Eu(PO4)3 and Sr3Eu(PO4)3
Место публикации : Dalton Trans.: Royal Society of Chemistry, 2015. - Vol. 44, Is. 16. - P.7679-7686. - ISSN 1477, DOI 10.1039/c4dt03887h. - ISSN 14779234(eISSN)
Примечания : Cited References:65. - This work was supported by the National Natural Science Foundations of China (grant no. 51032007, no. 51002146, no. 51272242), the Research Fund for the Doctoral Program of Higher Education of China (grant no. 20130022110006), Natural Science Foundations of Beijing (2132050), and the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047) and Beijing Youth Excellent Talent Program (YETP0635). VVA is partly supported by the Ministry of Education and Science of the Russian Federation.
Предметные рубрики: LIGHT-EMITTING-DIODES
DOPED Sr3Gd(PO4(3 PHOSPHOR
EFFICIENT
Аннотация: In this study, the Ba3Eu(PO4)3 and Sr3Eu(PO4)3 compounds were synthesized and the crystal structures were determined for the first time by Rietveld refinement using powder X-ray diffraction (XRD) patterns. Ba3Eu(PO4)3 crystallizes in cubic space group I3d, with cell parameters of a = 10.47996(9) Å, V = 1151.01(3) Å3 and Z = 4; Ba2+ and Eu3+ occupy the same site with partial occupancies of 3/4 and 1/4, respectively. Besides, in this structure, there exists two distorted kinds of the PO4 polyhedra orientation. Sr3Eu(PO4)3 is isostructural to Ba3Eu(PO4)3 and has much smaller cell parameters of a = 10.1203(2) Å, V = 1036.52(5) Å3. The bandgaps of Ba3Eu(PO4)3 and Sr3Eu(PO4)3 are determined to be 4.091 eV and 3.987 eV, respectively, based on the UV–Vis diffuse reflectance spectra. The photoluminescence measurements reveal that, upon 396 nm n-UV light excitation, Ba3Eu(PO4)3 and Sr3Eu(PO4)3 exhibit orange-red emission with two main peaks at 596 nm and prevailing 613 nm, corresponding to the 5D0 → 7F1 and 5D0 → 7F2 transitions of Eu3+, respectively. The dynamic disordering in the crystal structures contributes to the broadening of the luminescence spectra. The electronic structure of the phosphates was calculated by the first-principles method. The analysis elucidats that the band structures are mainly governed by the orbits of phosphorus, oxygen and europium, and the sharp peaks of the europium f-orbit occur at the top of the valence bands.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhachev A. L., Malakhovskii A. V., Nelson C. S., Gudim I. A., Temerov V. L.
Заглавие : Comparison of the absorption spectra of Nd3+ ions in the NdFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and Ho0.75Nd0.25Fe3(BO3)4 crystals
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 1. - P.113-121. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783421010200
Примечания : Cited References: 21. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: number 19-42-240003 “Influence of the local en-vironment on magneto-optical properties of f–f transitions in rare-earth aluminum and iron borates”
Аннотация: The polarized optical absorption spectra in the region of a series of the f–f transitions of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and NdFe3(BO3)4 crystals at 90 K have been compared. The spectral features related to the difference in the local environment of Nd3+ ions in these crystals have been established. In the region of the transition 4I9/2 → 4G5/2 + 2G7/2 of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4 crystal, the appearance of some absorption lines at the structural transition R32 → P3121 around ~200 K due to the local symmetry variation has been found. The intensity of these lines smoothly increases with a decrease in temperature from the transition point. The temperature dependence of the lattice parameters of the Ho0.75Nd0.25Fe3(BO3)4 crystal has been measured. It has been found that, at the transition temperature, the lattice parameter a changes stepwise, which is indicative of the occurrence of a first-order phase transition. The lattice parameter c changes smoothly.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Belskaya N., Bashleev Z., Molokeev M. S., Soloviev L., Shabanova K.
Заглавие : Crystal growth of ReCa3Mn3O3(BO3)4 (Re = Gd, Y) gaudefroyite: Phase sequence and equilibrium study in multi-component fluxes
Место публикации : J. Cryst. Growth. - 2022. - Vol. 600. - Ст.126917. - ISSN 00220248 (ISSN), DOI 10.1016/j.jcrysgro.2022.126917
Примечания : Cited References: 32. - The study was supported by the Russian Science Foundation (grant No. 21-72-00130). The X-ray, and EDX data were obtained using the analytical equipment of the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: The work is aimed at studying the crystallization of ReCa3Mn3O3(BO3)4 (Re = Gd, Y) borates with the gaudefroyite structure in different flux systems. Gaudefroyites are promising materials in the field of spin ice and magnetocaloric effect. The study has been performed on systems based on the following solvents: Bi2Mo3O12-Na2B4O7-B2O3, Bi2O3-Na2B4O7-B2O3, Bi2O3-BaO-Na2B4O7-B2O3, Li2WO4-Li2O-B2O3. The influence of the solvent components on the sequence of high-temperature crystallizing phases has been studied. The feature of Mo- and W-containing fluxes consisting in the formation of stable chemical bonds of the M2+Mo(W)O4 (M = Ca, Mn) molybdate or tungstate types has been revealed which prevents the formation of gaudefroyite type bonds. An approach has been suggested for changing the sequence of the crystallizing phases which consists in the super saturation of molybdate (tungstate) bonds by Na+ or Li+ cations up to the formation of delafossite-type bonds (Li(Na)-Mn-O phase) with higher manganese valence states Mn3+ and Mn4+. The optimization of the growth conditions of ReCa3(MnO)3(BO3)4 (Re = Gd, Y) gaudefroyite crystals has allowed one to obtain single crystal samples with the size up to 0.8 × 0.8 × 5 mm3. The structural characterization and chemical composition of all the obtained phases are also presented.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Galyas A. I., Demidenko O. F., Makovetskii G. I., Yanushkevich K. I., Ryabinkina L. I., Romanova O. B.
Заглавие : Crystal structure and electrical properties of Gd (x) Mn1-x S and Ti (x) Mn1-x Se solid solutions
Коллективы :
Разночтения заглавия :авие SCOPUS: Crystal structure and electrical properties of GdxMn1 - xS and TixMn1 - xSe solid solutions
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 4. - P687-690. - ISSN 1063-7834, DOI 10.1134/S1063783410040037
Примечания : Cited References: 10. - This study was supported by the Belarussian Republican Foundation for Fundamental Research (project no. F04-182), the Russian Foundation for Basic Research-Belarussian Republican Foundation for Fundamental Research (project no. 08-02-90031), the Russian Foundation for Basic Research (project nos. 09-02-00554-a and 09-02-92001-NNS-a), and the Federal Agency for Education of the Russian Federation (the State Program "Development of the Scientific Potential of the Higher School," project no. 2.1.1/401).
Предметные рубрики: MNSE
SULFIDES
CO
Аннотация: Regions of the existence of sulfide Gd (x) Mn1 - x S and selenide Ti (x) Mn1 - x Se solid solutions have been identified. Their electrical and thermoelectric properties have been studied in the temperature range 80-900 K. It has been established that the substitution of Gd2+ and Ti2+ ions for Mn2+ cations initiates reversal of the type of charge carrier with respect to the starting compounds MnS and MnSe. The cation substitution in solid solutions brings about a change from the hole conduction (alpha 0) characteristic of the manganese monosulfide and monoselenide to the electronic conduction (alpha 0).
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platunov M. S., Dudnikov V. A., Orlov Yu. S., Kazak N. V., Solovyov L. A., Zubavichus Y. V., Veligzhanin A. A., Dorovatovskii P. V., Vereshchagin S. N., Shaykhutdinov K. A., Ovchinnikov S. G.
Заглавие : Crystal structure and electronic states of Co and Gd ions in a Gd0.4Sr0.6CoO2.85 single crystal
Коллективы : Russian Foundation for Basic Research [13-02-00958, 13-02-00358, 14-02-31051, 16-32-60049]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [SP-938.2015.5]; program "UMNIK"; Siberian Branch, Russian Academy of Sciences [V.45.3.1]
Место публикации : JETP Letters. - 2016. - Vol. 103, Is. 3. - P.196-200. - ISSN 0021-3640, DOI 10.1134/S0021364016030139. - ISSN 1090-6487(eISSN)
Примечания : Cited References:20. - This work was supported in part by the Russian Foundation for Basic Research (project nos. 13-02-00958, 13-02-00358, 14-02-31051, and 16-32-60049), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. SP-938.2015.5), and by the program "UMNIK." The X-ray diffraction and thermochemical studies were supported by the Siberian Branch, Russian Academy of Sciences (project no. V.45.3.1).
Предметные рубрики: X-RAY-ABSORPTION
PROFILE REFINEMENT
PEROVSKITE
CHARGE
SPIN
Аннотация: X-ray diffraction and X-ray absorption near edge structure (XANES) spectra have been measured at the Со K-edge and Gd L3-edge in GdCoO3 and Gd0.4Sr0.6CoO2.85 cobaltites. The effect of Sr substitution on the crystal structure and electronic and magnetic states of Co3+ ions in a Gd0.4Sr0.6CoO2.85 single crystal has been analyzed. The XANES measurements at the Co K-edge have not showed a noticeable shift of the absorption edge with an increase in the concentration of Sr. This indicates that the effective valence of cobalt does not change. An increase in the intensity of absorption at the Gd L3-edge is due to an increase in the degree of hybridization of the Gd(5d) and O(2p) states. The effect of hole doping on the magnetic properties results in the appearance of the ferromagnetic component and in a significant increase in the magnetic moment.
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