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Biogenic ferrihydrite nanoparticles doped with gadolinium [Текст] / S. V. Stolyar [и др.] // V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism : abstracts. - Vladivostok : FEFU, 2013. - P232 . - ISBN 978-5-7444-3124-2

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Bayukov, O. A.; Баюков, Олег Артемьевич; Ladygina, V. P.; Ладыгина, Валентина Петровна; Ishchenko, L. A.; Ищенко Л. А.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)
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    Structure and magnetic properties of biogenic ferrihydrite nanoparticles doped with gadolinium / S. V. Stolyar [et al.] // J. Sib. Fed. Univ. Math. Phys. - 2013. - Vol. 6, Is. 3. - P. 358-365 ; Журн. СФУ. Сер. "Математика и физика" . - ISSN 1997-1397
   Перевод заглавия: Структура и магнитные свойства биогенных наночастиц ферригидрита, легированных гадолинием
Кл.слова (ненормированные):
ferrihydrite nanoparticle -- bacterial culture Klebsiela oxytoca -- Mössbauer spectroscopy -- gadolinium doping
Аннотация: Bacterial culture Klebsiella oxytoca was grown in a Lovley medium at various concentrations of gadolinium salt. Biogenic magnetic nanoparticles of ferrihydrite were investigated by Mossbauer spectroscopy and magnetization curves were obtained. The results of structural studies showed that iron Fe(5) takes new position when cultivating is carried out in medium with high concentrations of gadolinium. It was found that gadolinium is fit into the crystal structure of ferrihydrite. These results are consistent with the analysis of the magnetization curves.

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Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Bayukov, O. A.; Баюков, Олег Артемьевич; Ladygina, V. P.; Ischenko, L. A.; Iskhakov, R. S.; Исхаков, Рауф Садыкович

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Magnetic and thermophysical properties of GdxMn1-xS solid solutions / S. S. Aplesnin [et al.] // J. Phys.: Condens. Matter. - 2013. - Vol. 25, Is. 2. - Ст. 025802. - P. , DOI 10.1088/0953-8984/25/2/025802 . - ISSN 0953-8984
Кл.слова (ненормированные):
Antiferromagnetic orders -- Band state -- Face-centered cubic lattices -- Magnetic phase transitions -- Paramagnetic phase -- Temperature dependence -- Antiferromagnetism -- Electron transitions -- Gadolinium -- Manganese -- Paramagnetism -- Sodium chloride -- Specific heat -- Organic polymers
Аннотация: The structural, magnetic, and thermophysical properties of cation-substituted sulfides GdXMn1-XS (0.04 ? X ? 0.25) with the NaCl-type face-centered cubic lattice have been investigated. The range of existence of long-range antiferromagnetic order has been established. The anomalies observed in the temperature dependence of the specific heat correspond to the temperatures of the magnetic phase transition. The anomaly in the specific heat caused by electron transitions between the 4f levels and d band states has been observed. It has been found that the coefficient of thermal expansion decreases with increasing concentration of substituents in the magnetically ordered region and remains nearly invariable in the paramagnetic phase. В© 2013 IOP Publishing Ltd.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Daghestan Sci Ctr, Amirkhanov Inst Phys, Makhachkala 367003, Russia

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Romanova, O.; Романова, Оксана Борисовна; Gorev, M. V.; Горев, Михаил Васильевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Gamzatov, A. G.; Aliev, A. M.
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Coupled R and Fe magnetic excitations in RFe 3(BO 3) 4 multiferroics / A. M. Kuzmenko [et al.] // Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P. 269-272, DOI 10.4028/www.scientific.net/SSP.190.269 . - ISBN 9783037854365
Кл.слова (ненормированные):
Magnetic resonance -- Rare-earth iron borates -- Terahertz spectroscopy -- Antiferromagnetics -- Coupled mode -- Exchange coupled -- Frequency ranges -- G factors -- Iron borate -- Magnetic excitations -- Multiferroics -- Resonance mode -- Strong interaction -- Transmission spectrums -- Antiferromagnetism -- Electron transitions -- Gadolinium -- Ions -- Magnetic materials -- Magnetic permeability -- Magnetic resonance -- Terahertz spectroscopy -- Neodymium
Аннотация: Various resonance modes were observed in the transmission spectra of rare-earth iron borates RFe 3(BO 3) 4 (R = Nd 3+, Sm 3+, Gd 3+) at the frequency range 100-600 GHz, which were attributed to collective magnetic excitations in the exchange coupled Fe- and R-subsystems, i.e. antiferromagnetic (Fe) resonance and electron transitions in the R-ions. Strong interaction of the Fe and R oscillations was revealed and theoretically analyzed taking into account feature of the R-ion ground state. Intensities of the coupled modes (contributions to magnetic permeability) strongly depend on a difference of Fe and R ions g-factors that allows defining the sign of the latter. In particular, an appreciable intensity of exchange (Nd) modes in NdFe 3(BO 3) 4 is caused by g Nd?,|| < 0 whereas in GdFe 3(BO 3) 4 with gGd ? gFe ? 2 the exchange (Gd) modes were hided due to compensation of Fe and Gd contributions. In SmFe 3(BO 3) 4, despite a negligible Sm g-factor, the Sm modes were clear observed due to their excitation via coupling with the Fe-subsystem. В© (2012) Trans Tech Publications.

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Доп.точки доступа:
Kuzmenko, A. M.; Кузьменко А.М.; Mukhin, A. A.; Ivanov, V.Yu.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Moscow International Symposium on Magnetism(5 ; 2011 ; Aug. ; 21-25 ; Moscow)
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    Тонкие пленки железогадолиниевых сплавов [Текст] / Л. В. Киренский [и др.] // Изв. АН СССР, Сер. физич. - 1965. - Т. 29, № 4. - С. 689-694. - Библиогр.: 12 назв. - Phys. Abstr. - 1966. - Vol. 69, 31713
   Перевод заглавия: Thin films of iron-gadolinium alloys

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Киренский, Леонид Васильевич; Kirenskii, L. V.; Неделько, А. А.; Буравихин, Виктор Анатольевич; Пузей, Иван Михайлович; Всесоюзный симпозиум по физике тонких ферромагнитных пленок(2 ; 1964 ; июль ; 10-15 ; Иркутск)
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    Gd3Ga5O12:Nd3+ crystals for a continuous-wave diode-pumped laser operating in 4F3/2 4I11/2 and 4F3/2 4I13/2 channels / A. A. Kaminskii [et al.] // Crystallogr. Rep. - 2002. - Vol. 47, Is. 2. - P. 308-312, DOI 10.1134/1.1466508. - Cited References: 15 . - ISSN 1063-7745
Рубрики:
GALLIUM GARNET
   EMISSION
Кл.слова (ненормированные):
gadolinium -- gallium -- neodymium -- article -- concentration response -- crystal -- pump -- spectroscopy -- X ray -- x ray topography
Аннотация: Garnet crystals of the composition Gd3Ga5O12:Nd3+ (concentration series CNd = 1-10 at. %) were grown from flux. In terms of spectroscopy, these crystals, unlike those grown from melts, form a medium with a single activator center. For the first time, continuous-wave lasing was excited by diode pumping with the use of Gd3Ga5O12:Nd3+ crystals at the wavelengths ?3 = 1.3315 and ?4 = 1.3370 ?m of the 4F3/2 > 4I13/2 channel and also the simultaneous generation at two wavelengths, ?1 = 1.0621 and ?2 = 1.0600 ?m, of the 4F3/2 > 4I11/2 channel. В© 2002 MAIK "Nauka/Interperiodica".

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Другая переводная версия Crystals Gd3Ga5O12:Nd3+ for a continuous-wave diode-pumped laser operating in 4F3/24I11/2 and 4F3/24I13/2 channels [Текст] / A. A. Kaminskij [и др.] // Kristallogr. - 2002. - Vol. 47 Is. 2.- P.344-349 ; Crystallogr. Rep.

Публикация на русском языке Раствор-расплавные кристаллы Gd3Ga5O12:Nd3+ для непрерывных лазеров (4F3/2→4I11/2 и 4F3/2→4I13/2 каналы) с диодно-лазерной накачкой [Текст] / А. А. Каминский [и др.] // Кристаллография. - 2002. - Т. 47 Вып. 2. - С. 344-348

Держатели документа:
Shubnikov Inst. of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow 117333, Russian Federation

Доп.точки доступа:
Kaminskii, A. A.; Butashin, A. V.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович; Kravtsov, N. V.; Firsov, V. V.; Seo, D. T.; Hommerich, U.; Temple, D.; Braud, A.
}
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Magnetic nanoparticles origin in glasses co-doped with iron and gadolinium oxides / R. D. Ivantsov [et al.] // Third Asian school-conference on physics and technology of nanostructured materials (ASCO-NANOMAT 2015) : proceedings. - Vladivostok : Dalnauka, 2015. - Ст. VI.21.06p . - ISBN 978-5-8044-1556-4

Материалы конференции

Доп.точки доступа:
Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Ivanova, O. S.; Иванова, Оксана Станиславовна; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Zubavichus, Y. V.; Mikhlin, Y. L.; Михлин, Юрий Леонидович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Asian School-Conference on Physics and Technology of Nanostructured Materials(3 ; 2015 ; Aug. ; 19-26 ; Vladivostok); Азиатская школа-конференция по физике и технологии наноструктурированных материалов(3 ; 2015 ; авг. ; 19-26 ; Владивосток)
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Magnetic properties and the metal-insulator transition in GdXMn1-XS solid solutions / O. B. Romanova [et al.] // Solid State Commun. - 2010. - Vol. 150, Is. 13-14. - P. 602-604, DOI 10.1016/j.ssc.2009.12.042. - Cited References: 13. - This study was supported by the Russian Foundation for Basic Research project No. 09-02-00554_a; No. 09-02-92001-NNS_a; No. 08-02-90031 Bel_a and Belarus Foundation for Basic Research project No. F04-182; ADTF "Development of scientific potential of the higher school" No. 2.1.1/401. . - ISSN 0038-1098

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
Insulator -- Metals -- Crystal growth -- Phase transitions -- Insulator -- Metals -- Crystal growth -- Phase transitions -- Insulator -- Metals -- Antiferromagnetic semiconductors -- Crystal growth -- Cubic lattice -- Metal-insulator phase transition -- Orders of magnitude -- P-type -- Temperature range -- Thermoelectric properties -- Thermopowers -- Antiferromagnetic materials -- Antiferromagnetism -- Crystal growth -- Crystallization -- Electric properties -- Gadolinium -- Grain boundaries -- Magnetic fields -- Magnetic properties -- Manganese -- Manganese compounds -- Metal insulator boundaries -- Metals -- Semiconductor growth -- Semiconductor insulator boundaries -- Sodium chloride -- Solid solutions -- Solidification -- Metal insulator transition
Аннотация: The structural, magnetic, electrical, and thermoelectric properties of GdXMn1-XS (0.01 <= X <= 0.3) solid solutions synthesized for the first time on the basis of alpha-MnS have been studied experimentally in the temperature range 77-1000 K in magnetic fields up to 10 kOe. The synthesized samples are antiferromagnetic semiconductors with an NaCl-type cubic lattice typical of a-MnS. Both concentration (X-c = 0.3) and temperature (T-c = 450 K) metal-insulator phase transitions have been observed. The concentration metal-insulator transition is accompanied by a decrease in resistivity and thermopower by twelve and two orders of magnitude, respectively, with the change in conductivity from p-type to n-type. (C) 2010 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Romanova, O. B.
Ryabinkina, L. I.
Velikanov, D. A.
Balaev, D. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Sokolov, V. V.
Pichugin, A. Yu.] Russian Acad Sci, Inst Inorgan Chem, Siberian Branch, Novosibirsk 630090, Russia
[Galyas, A. I.
Demidenko, O. F.
Makovetskii, G. I.
Yanushkevich, K. I.] Natl Acad Sci Belarus, GO NPTs Mat Sci Ctr, Minsk 220072, Byelarus
ИФ СО РАН
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Institute of Inorganic Chemistry, Russian Academy of Sciences, Siberian Branch, 630090 Novosibirsk, Russian Federation
GO NPTs Materials Science Center, National Academy of Sciences of Belarus, 220072 Minsk, Belarus

Доп.точки доступа:
Romanova, O. B.; Романова, Оксана Борисовна; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Sokolov, V. V.; Pichugin, A. Y.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Galyas, A. I.; Demidenko, O. F.; Makovetskii, G. I.; Yanushkevich, K. I.
}
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Magnetic structure of the field-induced multiferroic GdFe3(BO3)(4) / H. D. Mo [et al.] // Phys. Rev. B. - 2008. - Vol. 78, Is. 21. - Ст. 214407, DOI 10.1103/PhysRevB.78.214407. - Cited References: 35. - We thank W. Schoenig, D. Coburn, S. Wilkins, and J. Hill for their support at X22C, S. LaMarra for his support at X21, and D. Connor for a critical reading of the manuscript. Use of the National Synchrotron Light Source, Brookhaven National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
IRON BORATE GDFE3(BO3)(4)
   X-RAY-SCATTERING
   POLARIZATION DEPENDENCE
   EXCHANGE SCATTERING
   RESONANCE
   FERROELECTRICITY
Кл.слова (ненормированные):
ferromagnetic materials -- gadolinium compounds -- iron compounds -- magnetic structure -- multiferroics -- Neel temperature -- spin dynamics -- X-ray scattering
Аннотация: We report a magnetic x-ray scattering study of the field-induced multiferroic GdFe3(BO3)(4). Resonant x-ray magnetic scattering at the Gd L-II,L-III edges indicates that the Gd moments order at T-N approximate to 37 K. The magnetic structure is incommensurate below T-N, with the incommensurability decreasing monotonically with decreasing temperature until a transition to a commensurate magnetic phase is observed at T approximate to 10 K. Both the Gd and Fe moments undergo a spin reorientation transition at T-SR approximate to 9 K such that the moments are oriented along the crystallographic c axis at low temperatures. With magnetic field applied along the a axis, our measurements suggest that the field-induced polarization phase has a commensurate magnetic structure with Gd moments rotated similar to 45 degrees toward the basal plane, which is similar to the magnetic structure of the Gd subsystem observed in zero field between 9 and 10 K, and the Fe subsystem has a ferromagnetic component in the basal plane.

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Держатели документа:
[Mo, Haiding
Nelson, Christie S.] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA
[Bezmaternykh, Leonard N.
Temerov, V. T.] RAS, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973, United States
L. V. Kirensky Institution of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Mo, H. D.; Nelson, C. S.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. T.
}
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10.

Magnetoelectric interactions in rare-earth ferroborates / A. M. Kadomtseva [et al.] // J. Exp. Theor. Phys. - 2007. - Vol. 105, Is. 1. - P. 116-119, DOI 10.1134/S1063776107070254. - Cited References: 14 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GDFE3(BO3)(4)
Кл.слова (ненормированные):
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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Держатели документа:
Moscow MV Lomonosov State Univ, Moscow 119992, Russia
Russian Acad Sci, Inst Gen Phys, Moscow 119991, Russia
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Moscow State University, Moscow 119992, Russian Federation
Institute of General Physics, Russian Academy of Sciences, ul. Vavilova 38, Moscow 119991, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Kadomtseva, A. M.; Zvezdin, A. K.; Pyatakov, A. P.; Kuvardin, A. V.; Vorob'ev, G. P.; Popov, Y. F.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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11.

Magneto-optical properties of Dy3+ in oxide glasses: The origin of the magneto-optical activity of f-f transitions and its anomalous temperature dependence / A. V. Malakhovskii [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 4. - P. 701-707, DOI 10.1134/S1063783407040178. - Cited References: 28 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC CIRCULAR-DICHROISM
   FLUOROZIRCONATE ZBLAN GLASS
   OPTICAL-ABSORPTION SPECTRA
   DOPED SODA GLASS
   SPECTROSCOPIC PROPERTIES
   FLUOROBORATE GLASSES
   LITHIUM BORATE
   IONS
   PR3+
   GADOLINIUM
Аннотация: The temperature dependence of the absorption spectra and magnetic circular dichroism due to f-f transitions from the H-6(15/2) to F-6 (5/2) and (6)(F (7/2) + H (5/2)) states in the Dy3+ ion in (Dy2O3-P2O5-SiO2-GeO2) and (Dy2O3-La2O3-Al2O3-B2O3-SiO2-GeO2) glasses and the temperature dependence of the Faraday effect were studied. The temperature dependence of the Faraday effect caused by f-d transitions was found to differ from that of the magnetic circular dichroism due to f-f transitions. It was shown that f-f transitions occur preferentially in Dy3+ ions associated into clusters. The origin of the paramagnetic magneto-optical activity of f-f transitions was analyzed. It was shown that the contributions to this activity can differ in value and sign and that the ratio between these contributions depends on the transition type. In some cases, this difference results in an anomalous temperature dependence of the magneto-optical activity.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
SI Vavilov State Opt Inst, St Petersburg 192371, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660041, Russian Federation
Vavilov State Optical Institute, Birzhevaya liniya 12, St. Petersburg, 192371, Russian Federation

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Isachenko, V. A.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Potseluyko, A. M.; Zabluda, V. N.; Заблуда, Владимир Николаевич; Zarubina, T. V.; Edelman, I. S.; Эдельман, Ирина Самсоновна
}
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12.

Unusual magnetic phase transitions in Gd3+ clusters in multicomponent oxide glasses / J. . Kliava [et al.] // J. Supercond. Nov. Magn. - 2007. - Vol. 20, Is. 2. - P. 149-153, DOI 10.1007/s10948-006-0116-4. - Cited References: 7 . - ISSN 1557-1939

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
GADOLINIUM
RESONANCE
Кл.слова (ненормированные):
oxide glasses -- gadolinium -- magnetic clusters -- superparamagnetism -- Gadolinium -- Magnetic clusters -- Oxide glasses -- Superparamagnetism -- Magnetic clusters -- Magnetic phase transitions -- Oxide glasses -- Weiss constant -- Antiferromagnetic materials -- Ferromagnetic materials -- Gadolinium -- Magnetic anisotropy -- Magnetic susceptibility -- Paramagnetic resonance -- Phase transitions -- Positive ions -- Superparamagnetism -- Glass
Аннотация: Magnetic susceptibility, EPR and optical properties have been studied in a glass system {20La(2)O(3) - 22Al(2)O(3) - 23B(2)O(3) - 35(SiO2 + GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in more heavily doped glasses; two magnetic transitions at 55 and 12 K have been detected and ascribed, respectively, to ferromagnetic and antiferromagnetic clusters of Gd3+ ions. The EPR spectra confirm the clustering at higher Gd contents. At low temperatures the cluster-related resonance indicates an onset of magnetic anisotropy. The clustering, depending on the Gd concentration, correlates with a shift to lower energies of the strong optical absorption band edge.

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Держатели документа:
Univ Bordeaux 1, Cours Liberat 351, CP MOH, UMR 5798, F-33405 Talence, France
RAS, SB, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
SV Vavilov State Opt Inst, St Petersburg 199034, Russia
ИФ СО РАН
CPMOH, UMR 5798 CNRS-Universite Bordeaux-I, 33405 Talence Cedex, France
L.V. Kirensky Institute of Physics, SB, RAS, Krasnoyarsk 660036, Russian Federation
Bar-Ilan University, Department of Physics, Ramat-Gan 52900, Israel
S.V. Vavilov State Optical Institute, St.-Petersburg 199034, Russian Federation
CPMOH, Universite Bordeaux-I, 351 Cours de la Liberation, 33405 Talence Cedex, France

Доп.точки доступа:
Kliava, J.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Potseluyko, A. M.; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Bruckental, I.; Yeshurun, Y.; Zarubina, T.
}
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13.

Optical transitions in GdFe3(BO3)(4) and FeBO3 under high pressures / A. G. Gavriliuk [et al.] // J. Phys.: Condens. Matter. - 2005. - Vol. 17: 2nd International Symposium on Physics of Solids Under High Presure Using Nuclear Probes (JUL 22-25, 2004, Cologne, GERMANY), Is. 48. - P. 7599-7604, DOI 10.1088/0953-8984/17/48/011. - Cited References: 8 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
ELECTRONIC-STRUCTURE
Кл.слова (ненормированные):
Band structure -- Coulomb blockade -- High pressure effects -- Iron compounds -- Magnetic moments -- Mathematical models -- Optical properties -- Relaxation processes -- Coulomb correlations -- Electron correlations -- Insulator-semiconductor transitions -- Optical transitions -- Gadolinium compounds
Аннотация: The optical properties of GdFe3(BO3)(4) under high pressures have been investigated experimentally and theoretically, and the results are compared with the properties of FeBO3. A model of the GdFe3(BO3)(4) band structure is derived within the multielectron model taking into account the strong electron correlations. Crossover of the Fe3+ ion high-spin and low-spin states, collapse of the magnetic moment, the relaxation Coulomb correlations, and insulator-semiconductor transition are predicted. Optical transitions in GdFe3(BO3)(4) and FeBO3 under high pressures were discovered.

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Держатели документа:
RAS, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
RAS, Inst Crystallog, Moscow 119333, Russia
RAS, Inst High Pressure Phys, Troitsk 142190, Russia
ИФ СО РАН
Institute of Crystallography, RAS, 119333, Moscow, Russian Federation
Institute for High Pressure Physics, RAS, 142190, Troitsk, Russian Federation
L V Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Gavriliuk, A. G.; Kharlamova, S. A.; Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Potseluyko, A. M.; Trojan, I. A.; Zabluda, V. N.; Заблуда, Владимир Николаевич
}
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14.

Studies of magnetic and optic properties of rare-earth gallo-ferroborates by Mossbauer and optical spectroscopy / O. A. Bayukov [et al.] // Physica B. - 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P. 1321-1323, DOI 10.1016/j.physb.2005.01.397. - Cited References: 3 . - ISSN 0921-4526

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk, Russia
Inst High Pressure Phys, Troitsk 142190, Russia
Inst Crystallog, Moscow 117333, Russia
Univ Liverpool, Liverpool L69 3BX, Merseyside, England
ИФ СО РАН
LV Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation
Institute of High Pressure Physics, 142190, Troisk, Moscow region, Russian Federation
Institute of Crystallograhy, Leninsky Av. 59, 117333, Moscow, Russian Federation
The University of Liverpool, Liverpool L69 3BX, United Kingdom

Доп.точки доступа:
Bayukov, O. A.; Баюков, Олег Артемьевич; Gavrilyuk, A. M.; Zabluda, V. N.; Заблуда, Владимир Николаевич; Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Potseluyko, A. M.; Tomas, M.; Trojan, I. A.; Kharlamova, S. A.
}
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15.

Unusual magnetic transitions and nature of magnetic resonance spectra in oxide glasses containing gadolinium / J. . Kliava [et al.] // Phys. Rev. B. - 2005. - Vol. 71, Is. 10. - Ст. 104406, DOI 10.1103/PhysRevB.71.104406. - Cited References: 40 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
ELECTRON-PARAMAGNETIC-RESONANCE
   BORATE GLASSES
   IONS
   BEHAVIOR
   GD3+
   SPECTROSCOPY
   SYSTEMS
   GD-3+
   FIELD
   SHAPE
Кл.слова (ненормированные):
gadolinium -- glass -- lanthanide -- oxide -- anisotropy -- article -- chemical structure -- concentration response -- electron spin resonance -- energy -- magnetism -- molecular physics -- nanoparticle -- phase transition -- refraction index -- temperature sensitivity
Аннотация: Magnetic susceptibility, electron paramagnetic resonance (EPR), and optical properties have been studied in a glass system {20La(2)O(3)-22Al(2)O(3)-23B(2)O(3)-35(SiO2+GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in the more heavily doped glasses and ascribed to clustering of Gd3+ ions. Two magnetic phase transitions at 55 and 12 K were detected and ascribed, respectively, to ferromagnetic and antiferromagnetic clusters containing Gd ions. The overall shape of the EPR spectra shows the presence of clustering at the higher Gd contents. At low temperatures the cluster-related resonance signal is altered in shape, indicating an onset of magnetic anisotropy field. This signal is convincingly fitted to superparamagnetic resonance arising from ferromagnetic nanoparticles. The clustering, depending on the Gd concentration, correlates with a significant shift to lower energies of the strong optical absorption band edge, ascribed to a charge transfer transition between Gd ions. A nonmonotonous change of refractive index with the increase of the Gd content indicates changes in the glass matrix and in Gd cluster structure.

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Держатели документа:
Univ Bordeaux 1, CNRS, UMR 5798, CPMOH, F-33405 Talence, France
Bar Ilan Univ, Dept Chem, IL-52900 Ramat Gan, Israel
RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
SI Vavilov State Opt Inst, St Petersburg 199034, Russia
Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
ИФ СО РАН
CPMOH, UMR 5798, CNRS-Universite Bordeaux-I, 33405 Talence Cedex, France
Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
L. V. Kirensky Institute of Physics SB RAS, Krasnoyarsk 660036, Russian Federation
S. V. Vavilov State Optical Institute, St. Petersburg 199034, Russian Federation
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel

Доп.точки доступа:
Kliava, J.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Potseluyko, A. M.; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Melnikova, S.V.; Мельникова, Светлана Владимировна; Zarubina, T. V.; Petrovskii, G.; Bruckental, Y.; Yeshurun, Y.
}
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16.

Magnetoelectric effects in gadolinium iron borate GdFe3(BO3)(4) / A. K. Zvezdin [et al.] // JETP Letters. - 2005. - Vol. 81, Is. 6. - P. 272-276, DOI 10.1134/1.1931014. - Cited References: 23 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
OPTICAL SPECTROSCOPY
   TRANSITIONS
   POLARIZATION
   PHASE
Аннотация: Magnetoelectric interactions have been investigated in a single crystal of gadolinium iron borate GdFe3(BO3)(4), whose macroscopic symmetry is characterized by the crystal class 32. Using the results of this study, the interplay of magnetic and electric orderings occurring in the system has been experimentally revealed and theoretically substantiated. The electric polarization and magnetostriction of this material that arise in spin-reorientation transitions induced by a magnetic field have been investigated experimentally. For H parallel to c and H perpendicular to c, H-T phase diagrams have been constructed, and a strict correlation between the changes in the magnetoelectric and magnetoelastic properties in the observed phase transitions has been ascertained. A mechanism of specific noncollinear antiferroelectric ordering at the structural phase transition point was proposed to interpret the magnetoelectric behavior of the system within the framework of the symmetry approach in the entire temperature range. This ordering provides the conservation of the crystal class of the system when the temperature decreases to the antiferroelectric ordering point. The expressions that have been obtained for the magnetoelectric and magnetoelastic energy describe reasonably well the behavior of gadolinium iron borate observed experimentally. (C) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Moscow MV Lomonosov State Univ, Moscow 119992, Russia
Russian Acad Sci, Inst Gen Phys, Moscow 119991, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siverian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Moscow State University, Vorob'evy gory, Moscow, 119992, Russian Federation
Institute of General Physics, Russian Academy of Sciences, Moscow, 119991, Russian Federation
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation

Доп.точки доступа:
Zvezdin, A. K.; Krotov, S. S.; Kadomtseva, A. M.; Vorob'ev, G. P.; Popov, Y. F.; Pyatakov, A. P.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Popova, E. A.
}
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17.

Spin reorientation effects in GdFe3(BO3)(4) induced by applied field and temperature / S. A. Kharlamova [et al.] // J. Exp. Theor. Phys. - 2005. - Vol. 101, Is. 6. - P. 1098-1105, DOI 10.1134/1.2163925. - Cited References: 14 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
RM(3)(BO3)(4) CRYSTALS
GROWTH
Кл.слова (ненормированные):
Antiferromagnetism -- Ground state -- Magnetic moments -- Magnetic properties -- Mossbauer spectroscopy -- Single crystals -- Temperature distribution -- Spin orientation -- Static magnetic measurements -- Gadolinium compounds
Аннотация: Magnetic properties of GdFe3(BO3)(4) single crystals were investigated by Fe-57-Mossbauer spectroscopy and static magnetic measurements. In the ground state, the GdFe3(BO3)(4) crystal is an easy-axis compensated antiferromagnet, but the easy axis of iron moments does not coincide with the crystal C-3 axis, deviating from it by about 20 degrees. The spontaneous and field-induced spin reorientation effects were observed and studied in detail. The specific directions of iron magnetic moments were determined for different temperatures and applied fields. Large values of the angle between the Fe3+ magnetic moments and the C-3 axis in the easy-axis phase and between Fe3+ moments and the a(2) axis in the easy-plane phase reveal the tilted antiferromagnetic structure. (c) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Liverpool, Liverpool L69 3BX, Merseyside, England
Inst Crystallog, Moscow 119333, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
University of Liverpool, L69 3BX, Liverpool, United Kingdom
Institute of Crystallography, Moscow, 119333, Russian Federation

Доп.точки доступа:
Kharlamova, S. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Thomas, M. F.; Lyubutin, I. S.; Gavriliuk, A. G.
}
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18.

Linear and nonlinear optical spectroscopy of gadolinium iron borate GdFe3(BO3)(4) / A. M. Kalashnikova [et al.] // JETP Letters. - 2004. - Vol. 80, Is. 5. - P. 293-297, DOI 10.1134/1.1825108. - Cited References: 26 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
ORTHOFERRITES
Аннотация: The optical spectra and the second-harmonic generation (SHG) are studied in a noncentrosymmetric GdFe3(BO3)(4) magnet. In the region of weak absorption (alpha similar to 20-400 cm(-1)) below similar to3 eV, three absorption bands are distinguished, which can be unambiguously assigned to forbidden electronic transitions from the ground (6)A(1) state of the Fe3+ ion to its excited states T-4(1) (similar to1.4 eV), T-4(2) (similar to2 eV), and (4)A(1), E-4 (similar to2.8 eV). Intense absorption begins in the region above 3 eV (alpha similar to 2-4 x 10(5) cm(-1)), where two bands at similar to4.0 and 4.8 eV are observed, which are caused by allowed electric dipole charge-transfer transitions. The spectral features of SHG in the 1.2-3.0-eV region are explained by a change in the SHG efficiency caused by a change in the phase mismatch. It is shown that in the weak absorption region, phase matching can be achieved for SHG. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia
Russian Acad Sci, Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Univ Dortmund, D-44227 Dortmund, Germany
Univ Nijmegen, NSRIM Inst, NL-6525 Nijmegen, Netherlands
ИФ СО РАН
Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russian Federation
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Experimental Physics II, Dortmund University, Dortmund, 44227, Germany
NSRIM Institute, University of Nijmegen, 6525, Netherlands

Доп.точки доступа:
Kalashnikova, A. M.; Pavlov, V. V.; Pisarev, R. V.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bayer, M.; Rasing, T.
}
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19.

Structural and electronic transitions in gadolinium iron borate GdFe3(BO3)(4) at high pressures / A. G. Gavriliuk [et al.] // JETP Letters. - 2004. - Vol. 80, Is. 6. - P. 426-432, DOI 10.1134/1.1830662. - Cited References: 20 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
TRIGONAL GDFE3(BO3)(4)
   RM(3)(BO3)(4) CRYSTALS
   OPTICAL-SPECTRA
   BAND-STRUCTURE
   FEBO3
   GROWTH
Аннотация: The optical properties and structure of gadolinium iron borate GdFe3(BO3)(4) crystals are studied at high pressures produced in diamond-anvil cells. X-ray diffraction data obtained at a pressure of 25.6 GPa reveal a first-order phase transition retaining the trigonal symmetry and increasing the unit cell volume by 8%. The equation of state is obtained and the compressibility of the crystal is estimated before and after the phase transition. The optical spectra reveal two electronic transitions at pressures similar to26 GPa and similar to43 GPa. Upon the first transition, the optical gap decreases jumpwise from 3.1 to similar to2.25 eV. Upon the second transition at P = 43 GPa, the optical gap deceases down to similar to0.7 eV, demonstrating a dielectric-semiconductor transition. By using the theoretical model developed for a FeBO3 crystal and taking into account some structural analogs of these materials, the anomalies of the high-pressure optical spectra are explained. (C) 2004 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Inst High Pressure Phys, Troitsk 142092, Moscow Region, Russia
Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Max Planck Inst Chem, D-55020 Mainz, Germany
ИФ СО РАН

Доп.точки доступа:
Gavriliuk, A. G.; Kharlamova, S. A.; Lyubutin, I. S.; Troyan, I. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Potseluiko, A. M.; Eremets, M. I.; Boehler, R.
}
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20.

Antiferromagnetic resonance and phase diagrams of gadolinium ferroborate GdFe3(BO3)(4) / A. I. Pankrats [et al.] // J. Exp. Theor. Phys. - 2004. - Vol. 99, Is. 4. - P. 766-775, DOI 10.1134/1.1826168. - Cited References: 16 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary

Кл.слова (ненормированные):
Anisotropy -- Antiferromagnetic materials -- Antiferromagnetism -- Phase diagrams -- Resonance -- Single crystals -- Antiferromagnetic resonance -- Antiferromagnets -- Crystal axis -- Transition fields -- Gadolinium compounds
Аннотация: Antiferromagnetic resonance in single crystals of rhombohedral gadolinium ferroborate GdFe3(BO3)(4) was studied. The frequency-field dependences of antiferromagnetic resonance over the frequency range 26-70 GHz and the temperature dependences of resonance parameters for magnetic fields oriented along the crystal axis and in the basal plane were determined. It was found that the iron subsystem, which can be treated as a two-sublattice antiferromagnet with anisotropy of the easy-plane type, experienced ordering at T = 38 K. At temperatures below 20 K, the gadolinium subsystem with the opposite anisotropy sign strongly influenced the anisotropic properties of the crystal. This resulted in a spontaneous spin-reorientation transition from the easy-plane to the easy-axis state at 10 K. Below 10 K, magnetic field-induced transitions between the states were observed. Experimental phase diagrams on the temperature-magnetic field plane were constructed for fields oriented along the crystal axis and in the basal plane. A simple model was used to calculate the critical transition fields. The results were in close agreement with the experimental values measured at T = 4.2 K for both field orientations. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Pankrats, A. I.; Панкрац, Анатолий Иванович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич
}
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