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Demidov, A. A.
Magnetic phase transitions in Nd1−xDyxFe3(BO3)4 ferroborates / A. A. Demidov, I. A. Gudim, E. V. Eremin // J. Exp. Theor. Phys. - 2012. - Vol. 114, Is. 2. - P. 259-272, DOI 10.1134/S1063776111160023. - Cited References: 29. - This study was supported financially by the President of the Russian Federation (grant no. MK-497.2010.2). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
SPIN REORIENTATION
   CRYSTAL
   DY
   ND
Аннотация: The magnetic properties of ferroborate single crystals with substituted compositions Nd1−xDyxFe3(BO3)4 (x = 0.15, 0.25) with competing exchange Nd-Fe and Dy-Fe interactions are investigated. For each composition, we observed a spontaneous spin-reorientation transition from the easy-axis to the easy-plane state and step anomalies on the magnetization curves for the spin-flop transition induced by a magnetic field B | c. The measured parameters and effects are interpreted using a unified theoretical approach based on the molecular field approximation and on calculations performed in the crystal-field model for the rare-earth ion. The experimental temperature dependences of the initial magnetic susceptibility from T = 2 K to T = 300 K, anomalies on the magnetization curves for B | c in fields up to 1.8 T, and their evolution with temperature, as well as temperature and field dependences of magnetization in fields up to 9 T are described. In the interpretation of experimental data, the crystal-field parameters in trigonal symmetry for the rare-earth subsystem are determined, as well as the parameters of Nd-Fe and Dy-Fe exchange interactions.

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Публикация на русском языке Демидов, А. А. Магнитные фазовые переходы в ферроборатах Nd1-xDyxFe3(BO3)4 / А. А. Демидов // Журнал экспериментальной и теоретической физики : Издательство "Наука", 2012. - Т. 141, N 2. - С. 294-309. - ISSN 0044-4510

Держатели документа:
[Demidov, A. A.] Bryansk State Tech Univ, Bryansk 241035, Russia
[Gudim, I. A.
Eremin, E. V.] Russian Acad Sci, Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660038, Russia

Доп.точки доступа:
Gudim, I. A.; Гудим, Ирина Анатольевна; Eremin, E. V.; Еремин, Евгений Владимирович; Демидов А. А.
}
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Contribution of Co3+ ions to the high-temperature magnetic and electrical properties of GdCoO3 / V. A. Dudnikov [et al.] // J. Exp. Theor. Phys. - 2012. - Vol. 114, Is. 5. - P. 841-849, DOI 10.1134/S106377611203003X. - Cited References: 28. - This work was supported by the Ural Branch of the Russian Academy of Sciences and Siberian Branch of the Russian Academy of Sciences (project no. 40), the Russian Foundation for Basic Research (project nos. 09-02-00171-a, 10-02-00251), program 2.3 of the Department of Physical Sciences of Russian Academy of Sciences, and Nonprofit Dinastiya Foundation. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
SPIN-STATE
   RCOO3 R
   TRANSITIONS
   COBALTITES
   LACOO3
   OXIDES
   SM
   EU
   ND
Аннотация: The temperature dependence of the static magnetization of polycrystalline rare-earth cobaltite GdCoO3 is measured in the temperature range 2-800 K. The magnetic behaviors of GdCoO3 and Gd3+ are found to be different at temperatures above room temperature, which is caused by the appearance of a contribution from Co3+ ions at high temperatures. The temperature dependence of the magnetic susceptibility of GdCoO3 is determined by the magnetization of rare-earth gadolinium ions and the additional paramagnetic contribution induced by the thermally excited magnetic terms of Co3+ ions. The LDA + GTB method is used to calculate the electronic structure of GdCoO3 in the temperature range 0-300 K with allowance for strong electron correlations. The energy spectrum of GdCoO3 is found to have intragap states that decrease the dielectric gap width with increasing temperature.

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Публикация на русском языке Вклад ионов Co3+ в высокотемпературные магнитные и электрические свойства GdCoO3 [Текст] / В. А. Дудников [и др.] // Ж. эксперим. и теор. физ. : Наука, 2012. - Т. 141 Вып. 5. - С. 966-975

Держатели документа:
[Dudnikov, V. A.
Ovchinnikov, S. G.
Orlov, Yu S.
Kazak, N. V.
Patrin, G. S.
Yurkin, G. Yu] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Dudnikov, V. A.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Ovchinnikov, S. G.
Patrin, G. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Michel, C. R.] Univ Guadalajara, Guadalajara 44430, Jalisco, Mexico

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Orlov, Yu.S.; Орлов, Юрий Сергеевич; Kazak, N. V.; Казак, Наталья Валерьевна; Michel, C. R.; Patrin, G. S.; Патрин, Геннадий Семёнович; Yurkin, G.Yu.; Юркин, Глеб Юрьевич
}
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Antiferromagnetic ordering in REM cobaltite GdCoO3 / V. A. Dudnikov [и др.] // Phys. Solid State. - 2012. - Vol. 54, Is. 1. - P. 79-83, DOI 10.1134/S106378341201009X. - Cited References: 16. - This study was supported by the program of the Branch of Physical Sciences of the Russian Academy of Sciences "Strong Electron Correlations," the Russian Foundation for Basic Research (project no. 09-02-00171-a), and Federal Agency for Science and Innovations (grant no. MK-5632.2010.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SPIN-STATE
   RCo3O3 R
   Sm
   Eu
   Nd
Аннотация: Temperature and magnetic-field dependences of the static magnetization of polycrystalline cobaltite GdCoO3 have been measured. The magnetic properties of the GdCoO3 sample have been studied in the paramagnetic and antiferromagnetic states. The magnetic phase diagram has been constructed. The exchange field between the Gd-Gd sublattices and the anisotropy field have been estimated.

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Публикация на русском языке Антиферромагнитное упорядочение в РЗМ-кобальтите GdCoO[3] [Текст] / В. А. Дудников [и др.] // Физ. тверд. тела. - 2012. - Т. 54 Вып. 1. - С. 72-78

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Kazak, N. V.; Казак, Наталья Валерьевна; Michel, C. R.; Bartolome, J.; Arauzo, A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Patrin, G. S.; Патрин, Геннадий Семёнович
}
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Low-temperature behavior of the magnetoelastic characteristics of praseodymium ferroborate / G. A. Zvyagina [et al.] // Low Temp. Phys. - 2010. - Vol. 36, Is. 4. - P. 296-302 ; Физика низких температур, DOI 10.1063/1.3420962. - Cited References: 16 . - ISSN 1063-777X

РУБ Physics, Applied
Рубрики:
CRYSTAL
STATE
ND
Аннотация: The behavior of the elastic moduli and sound absorption in a PrFe(3)(BO(3))(4) single crystal at low temperatures is studied. A transition of the magnetic subsystem into an antiferromagnetically ordered state is manifested in the temperature behavior of the sound velocities and absorption. The characteristic behavior of the elastic properties of PrFe(3)(BO(3))(4) in an external magnetic field is observed. A phenomenological theory that gives a qualitative description of the observed features is constructed. It is proposed that a weak magnetic moment exists in the crystal. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3420962]

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Держатели документа:
[Zvyagina, G. A.
Zhekov, K. R.
Bilych, I. V.
Zvyagin, A. A.] Natl Acad Sci Ukraine, BI Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
[Zvyagin, A. A.] Tech Univ Dresden, Inst Solid State Phys, D-01069 Dresden, Germany
[Bezmaternykh, L. N.
Gudim, I. A.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
B. I. Verkin Inst. for Low-Temperature Physics, Engineering, National Academy of Sciences of Ukraine, pr. Lenina 47, Kharkov 61103, Ukraine
B. I. Verkin Inst. for Low-Temperature Physics, Engineering, National Academy of Sciences of Ukraine, pr. Lenina 47, Kharkov 61103, Ukraine
Institute for Solid State Physics, Technical University Dresden, Dresden D-01069, Germany
L. V. Kirenskii Inst. of Physics of the Siberian Branch, The Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Zvyagina, G. A.; Zhekov, K. R.; Bilych, I. V.; Zvyagin, A. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна

}
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Magnetoelastic effects in terbium ferroborate / G. A. Zvyagina [et al.] // Low Temp. Phys. - 2008. - Vol. 34, Is. 11. - P. 901-908 ; Физика низких температур, DOI 10.1063/1.3009584. - Cited References: 17 . - ISSN 1063-777X

РУБ Physics, Applied
Рубрики:
CRYSTAL-STRUCTURE
ND
Кл.слова (ненормированные):
acoustic wave velocity -- antiferromagnetic materials -- elastic moduli -- exchange interactions (electron) -- iron compounds -- magnetoelastic effects -- solid-state phase transformations -- terbium compounds
Аннотация: The behavior of the elastic moduli and sound absorption in a terbium orthoborate single crystal at low temperatures is studied. The components of the tensor of the elastic moduli of this system are determined. A structural phase transition and a transition of the magnetic subsystem into an antiferromagnetically ordered state appear in the temperature dependences of the sound velocities and absorption. The magnetic field dependences of the velocities of transverse sound exhibit singularities in the form of jumps at a magnetic field equal to the field of the spin-flop transition of the antiferromagnetic subsystem. Theoretical analysis shows that the observed behavior of the acoustic characteristics are associated not with the rare-earth subsystem of ferroborate but rather with the renormalization of the exchange interaction between iron ions as a result of the magnetoelastic coupling.

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Держатели документа:
[Zvyagina, G. A.
Zhekov, K. R.
Bilych, I. V.
Zvyagin, A. A.] Natl Acad Sci Ukraine, BI Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
[Bezmaternykh, L. N.
Gudim, I. A.] Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
B. I. Verkin Institute for Low-Temperature Physics and Engineering, National Academy of Sciences of Ukraine, pr. Lenina 47, Kharkov 61103, Ukraine
L. V. Kirenskii Institute of Physics, Siberian Branch, Russian Adcademy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Zvyagina, G. A.; Zhekov, K. R.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Bilych, I. V.; Zvyagin, A. A.

}
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Effect of heterovalent substitution of rare-earth elements on the magnetic and transport properties of YBa2Cu3O7 / M. I. Petrov [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 11. - P. 2047-2051, DOI 10.1134/S1063783407110054. - Cited References: 18 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PR
   SUPERCONDUCTIVITY
   CE
   ND
   TRANSITION
   SYSTEM
   LA
Аннотация: The Y(1-x) Ce (x) Ba2Cu3O7 system with low cerium concentrations has been synthesized. The cerium solubility limit measured using x-ray powder diffraction analysis is about 2.4 at. %. The temperature dependences of the magnetization M(T) are measured for samples cooled in a magnetic field (FC) and in a zero field (ZFC). The difference between the magnetizations M-ZFC-M-FC at 77.4 K, which is proportional to the pinning potential, passes through a maximum at x = 0.0156. This concentration corresponds to the average distance (equal to eight lattice constants) between the impurity ions in the plane of the rare-earth elements, which is comparable to the diameter of Abrikosov vortices in YBa2Cu3O7.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfel'd, Yu. S.; Гохфельд, Юлия Сергеевна; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович
}
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Low-temperature magnetic behavior of the rare-earth cobaltites GdCoO3 and SmCoO3 / N. B. Ivanova [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 11. - P. 2126-2131, DOI 10.1134/S1063783407110182. - Cited References: 32. - This study was supported by the Branch of General Physics and Astronomy of the Russian Academy of Sciences within the framework of the program “Strong Electron Correlations” and the Russian Science Support Foundation . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
METAL-INSULATOR-TRANSITION
   RCOO3 R
   SPIN-STATE
   OXIDE
   SM
   ND
   PEROVSKITE
   GLASSES
   PR
   EU
Аннотация: The temperature and magnetic field dependences of the static magnetization of the polycrystalline rare-earth cobaltites GdCoO3 and SmCoO3 have been measured. It is shown that, below room temperature, the magnetization of both compounds derives primarily from the rare-earth ion paramagnetism. The GdCoO3 and SmCoO3 compounds have been found to differ substantially in magnetic behavior, which can be traced to differences in their electronic shell structures. The magnetic behavior of GdCoO3 is close to that of an array of free Gd3+ ions, whereas in SmCoO3 the deviation from the free-ion properties is very large because of the Sm3+ ground state being crystal-field split. Van Vleck magnetic susceptibility measurements of SmCoO3 suggest that the splitting is similar to 10 K.

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Публикация на русском языке Сравнение одноэлектронного и многоэлектронного механизмов концентрационной зависимости зонной структуры ВТСП-купратов [Текст] / В. А. Гавричков [и др.] // Физ. тверд. тела. - 2007. - Т. 49 Вып. 11. - С. 1958-1963

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Guadalajara, Dept Fis, CUCEI, Guadalajara 44430, Jalisco, Mexico
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Departamento de Fisica, C.U.C.E.I., Universidad de Guadalajara, Guadalajara, Jalisco 44430, Mexico

Доп.точки доступа:
Ivanova, N. B.; Иванова, Наталья Борисовна; Kazak, N. V.; Казак, Наталья Валерьевна; Michel, C. R.; Balaev, A. D.; Балаев, Александр Дмитриевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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Effect of strontium and barium doping on the magnetic state and electrical conductivity of GdCoO3 / N. B. Ivanova [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 8. - P. 1498-1506, DOI 10.1134/S1063783407080161. - Cited References: 36 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE
   ORDER
   OXIDE
   BEHAVIOR
   GLASSES
   LACOO3
   PR
   GD
   SM
   ND
Аннотация: A coordinated investigation of the magnetic and electrical properties of polycrystalline cobalt oxide compounds CdCoO3, Gd0.9Ba0.1CoO3, and Gd0.9Sr0.1CoO3 is carried out. Undoped GdCoO3 reveals a low conductivity; a magnetic moment of 7.4 mu(B) per molecule, which is less than the theoretical value for the Gd3+ ion; and an asymptotic Curie temperature of -6 K. Doping GdCoO3 with barium and strontium to substitution of 10 at. % Gd brings about an increase in the conductivity and magnetic transitions at T = 300 K for Gd0.9Ba0.1CoO3 and T = 170 K for Gd0.9Sr0.1CoO3. The magnetization anomalies imply the formation of magnetic clusters. The behavior of the electrical conductivity at high temperatures suggests a variable activation energy. At low temperatures, Mott hopping conduction sets in.

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Публикация на русском языке Влияние допирования стронцием и барием на магнитное состояние и электропроводность GdCoO[3] [Текст] / Н. Б. Иванова [и др.] // Физ. тверд. тела. - 2007. - Т. 49 Вып. 8. - С. 1427-1435

Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Guadalajara, CUCEI, Dept Fis, Guadalajara 44430, Jalisco, Mexico
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Departmento de Fisica, C.U.C.E.I., Universidade de Guadalajara, Guadalajara, Jalisco 44430, Mexico

Доп.точки доступа:
Ivanova, N. B.; Иванова, Наталья Борисовна; Kazak, N. V.; Казак, Наталья Валерьевна; Michel, C. R.; Balaev, A. D.; Балаев, Александр Дмитриевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Bulina, N. V.; Булина, Наталья Васильевна; Panchenko, E. B.
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Chukalina, E. P.
Spectroscopic study of magnetic phase transitions in NdxGd1-xFe3(BO3)(4) / E. P. Chukalina, L. N. Bezmaternykh // Phys. Solid State. - 2005. - Vol. 47: 12th Feofilov Workshop on Spectroscopy of Crystal Activated by Rare-Earth and Transition-Metal Ions (SEP 22-25, 2004, Yekaterinburg, RUSSIA), Is. 8. - P. 1528-1531, DOI 10.1134/1.2014507. - Cited References: 10 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTALS
ND
Аннотация: Magnetic ordering and spin reorientation in iron borates NdxGd1 - xFe3(BO3)(4) (x = 0.01, 0.04, 0.25, 1.0) are studied using a rare-earth spectroscopic probe. (c) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Oblast, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow oblast, 142190, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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10.

Cascade of phase transitions in GdFe3(BO3)(4) / R. Z. Levitin [et al.] // JETP Letters. - 2004. - Vol. 79, Is. 9. - P. 423-426, DOI 10.1134/1.1776236. - Cited References: 8 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
CRYSTALS
ND
Аннотация: Cascade of phase transitions in GdFe3(BO3)(4) at 156, 37, and 9 K has been detected by specific heat measurements and further studied by Raman scattering and Nd3+ spectroscopic probe method. A weakly first-order structural phase transition at 156 K is followed by a second-order antiferromagnetic ordering phase transition at 37 K and a first-order spin-reorientational phase transition at 9 K. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119992, Russia
Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia
Univ Groningen, Ctr Mat Sci, NL-9747 AG Groningen, Netherlands
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Levitin, R. Z.; Popova, E. A.; Chtsherbov, R. M.; Vasiliev, A. N.; Popova, M. N.; Chukalina, E. P.; Klimin, S. A.; van Loosdrecht, PHM; Fausti, D.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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11.

Raman scattering from phonons and magnons in RFe3(BO3)(4) / D. . Fausti [et al.] // Phys. Rev. B. - 2006. - Vol. 74, Is. 2. - Ст. 24403, DOI 10.1103/PhysRevB.74.024403. - Cited References: 26 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
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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Держатели документа:
Univ Groningen, Ctr Mat Sci, NL-9747 AG Groningen, Netherlands
RAS, Inst Spect, Troitsk 142190, Moscow Region, Russia
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Material Science Centre, University of Groningen, 9747 AG Groningen, Netherlands
Institute of Spectroscopy, RAS, 142190, Troitsk, Moscow Region, Russian Federation
L.V. Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Fausti, D.; Nugroho, A. A.; van Loosdrecht, PHM; Klimin, S. A.; Popova, M. N.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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12.

Optical spectroscopy of PrFe3(BO3)(4): Crystal-field and anisotropic Pr-Fe exchange interactions / M. N. Popova [et al.] // Phys. Rev. B. - 2009. - Vol. 80, Is. 19. - Ст. 195101, DOI 10.1103/PhysRevB.80.195101. - Cited References: 36. - We thank S. Klimin for useful information concerning the structure of PrFeINF3/INF(BOINF3/INF)INF4/INF and E. Chukalina for participating in some measurements. This work was supported in part by the Russian Foundation for Basic Research (Grants No. 07-02-01185 and No. 09-02-00930) and by the Russian Academy of Sciences under the Programs for Basic Research. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
TRIGONAL GDFE3(BO3)(4)
   NDFE3(BO3)(4)
   DYFE3(BO3)(4)
   TRANSITIONS
   BORATE
   ION
   ND
Кл.слова (ненормированные):
antiferromagnetic materials -- crystal field interactions -- exchange interactions (electron) -- infrared spectra -- iron compounds -- magnetic susceptibility -- magneto-optical effects -- paramagnetic materials -- praseodymium compounds -- spin Hamiltonians -- visible spectra
Аннотация: High-resolution polarized optical absorption spectra of PrFe3(BO3)(4) in the paramagnetic and antiferromagnetic phases are reported. The measured energies of the crystal-field (CF) levels within the 4f(2) configuration of Pr3+ in the paramagnetic PrFe3(BO3)(4) are described by the CF model that involves the 4f(2)/4f5d and 4f(2)/4f6p configuration interactions. Ordering of Fe spins along the crystalline c axis below T-N=32 K is confirmed by the analysis of the spectra of Er3+ introduced as a probe into PrFe3(BO3)(4). To account for the observed changes in the optical spectra of Pr3+ at temperatures below T-N, in particular, for the shift of the CF levels, splitting of the CF doublets, and the appearance of forbidden lines, the Pr-Fe exchange Hamiltonian defined by seven parameters is considered. The theoretical approach has been tested by calculating the temperature dependence of the magnetic susceptibility. A good agreement between theory and optical and magnetic experimental data is found demonstrating the validity of the model used. The obtained results confirm that the model of the iron dimers inside the spiral chains of Fe3+(O2-)(6) octahedrons introduced by us earlier for NdFe3(BO3)(4) and modified in the present work may serve as a basis for analyzing the low-temperature properties of other rare-earth iron borates.

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Держатели документа:
[Popova, M. N.
Stanislavchuk, T. N.] Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia
[Malkin, B. Z.] Kazan VI Lenin State Univ, Kazan 420008, Russia
[Bezmaternykh, L. N.] RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, 142190 Moscow Region, Russian Federation
Kazan State University, 420008 Kazan, Russian Federation
L.V. Kirensky Institute of Physics, Siberian Branch, RAS, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popova, M. N.; Stanislavchuk, T. N.; Malkin, B. Z.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Russian Foundation for Basic Research [07-02-01185, 09-02-00930]; Russian Academy of Sciences under the Programs for Basic Research
}
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13.

Element selective magnetism in Ho0.5Nd0.5Fe3(BO3)4 single crystal probed with hard X-ray magnetic circular dichroism / M. Platunov [et al.] // J. Magn. Magn. Mater. - 2019. - Vol. 479. - P. 312-316, DOI 10.1016/j.jmmm.2019.02.040. - Cited References: 40. - The study was supported in part by the grants of the Russian Foundation for Basic Research (project Nos. 16-32-60049, 17-02-00826, 18-42-243007) and the Foundation for Assistance to Small Innovative Enterprises (FASIE, UMNIK program). The magnetic measurements were carried out in the Shared Facility Centre of P.N. Lebedev Physical Institute of RAS. We are grateful to Dr. Alexey Bosak for providing assistance of the structural experiments on the ID28 beamline. We are also grateful to Dr. Evgeniy Eremin from Kirensky Institute of Physics for providing the results of magnetic measurements and for useful discussions. The authors thank the ID12 beamline staffs for help during the XMCD experiment and also gratefully acknowledge the beamtime provision (proposal HC-1804) by the ESRF. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
MICROSTRUCTURE
TRANSITIONS
ND
Кл.слова (ненормированные):
X-ray magnetic circular dichroism -- X-ray absorption -- Magnetic properties
Аннотация: We present a study of a Ho0.5Nd0.5Fe3(BO3)4 single crystal aiming at understanding the roles of each magnetic sublattices in magnetic transitions at low temperatures. The crystal structure is determined to have the R32 symmetry in whole studied temperature range but the crystal appears to be racemic. Element selective magnetic properties studied with X-ray magnetic circular dichroism at the L2,3-edges of Ho and Nd, and at the Fe K-edge at T = 3 K under magnetic fields of ±17 T are compared with the results of macroscopic magnetization measurements in pure and substituted crystals. All three magnetic sublattices are shown to be strongly coupled and to undergo a spin-reorientation transition when magnetic field is applied along the trigonal c-axis. On the contrary, when magnetic field is applied in the ab-plane only the holmium atoms exhibit a sizeable magnetization jump. This result allows us to conclude that the spin-flop transitions observed in macroscopic magnetization curves and associated anomalies of electric polarization are due to the Ho3+ magnetic moment reorientation.

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Akademgorodok 50,Bld 38, Krasnoyarsk 660036, Russia.
European Synchrotron, ESRF, 71 Ave Martyrs CS40220, F-38043 Grenoble 9, France.
Swiss Norwegian Beamlines ESRF, 71 Ave Martyrs CS40220, F-38043 Grenoble 9, France.
RAS, PN Lebedev Phys Inst, Moscow 119991, Russia.

Доп.точки доступа:
Platunov, M. S.; Платунов, Михаил Сергеевич; Kazak, N. V.; Казак, Наталья Валерьевна; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Knyazev, Yu. V.; Князев, Юрий Владимирович; Gavrilkin, S. Yu.; Dyadkin, Vadim; Dovgaliuk, Iurii; Chernyshov, Dmitry; Hen, Amir; Wilhelm, Fabrice; Rogalev, Andrei; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research [16-32-60049, 17-02-00826, 18-42-243007]; Foundation for Assistance to Small Innovative Enterprises (FASIE, UMNIK program)
}
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14.

Peschanskii, A. V.
Spectroscopic study of the TbAl3(BO3)4 single crystal: Raman and luminescence spectroscopy / A. V. Peschanskii, A. Y. Glamazda, I. A. Gudim // Low Temp. Phys. - 2020. - Vol. 46, Is. 12. - P. 1223-1230, DOI 10.1063/10.0002478. - Cited References: 20 . - ISSN 1063-777X. - ISSN 1090-6517

РУБ Physics, Applied
Рубрики:
SCATTERING
GENERATION
ND
Кл.слова (ненормированные):
TbAl3(BO3)4 -- vibrational spectrum -- electronic transitions -- Raman spectroscopy -- luminescence
Аннотация: The vibrational and luminescence properties of the TbAl3(BO3)4 single crystal were studied in the temperature range of 5–300 K. Raman spectra of the single crystal revealed 5 of 7 A1 and all E phonon modes predicted by the group-theory analysis. The splitting energy between the LO and TO components of polar E phonons is determined. A group of intense bands associated with the 5D4 → 7F0 electronic transition was observed in the energy range of 14520–14680 cm−1 of the luminescence spectra. The intensity of these bands decreases upon heating. At the same time, the bands which can be assigned with 5D4 → 7F6, 5D4 → 7F5, and 5D4 → 7F4 transitions were revealed in luminescence spectra at room temperature. The intensity of these bands is comparable to the intensity of the Raman spectrum of TbAl3(BO3)4. The observation of luminescence from the 5D4 multiplet (20600–20750 cm−1) upon excitation at λexc = 632.8 nm (15803 cm−1) and λexc = 532 nm (18797 cm−1) indicates strong nonlinear properties of the studied crystal. The structure of the main 7F6 multiplet of Tb+3 in the TbAl3(BO3)4 single crystal has been studied at 5 K by Raman spectroscopy. The energies of the electronic levels of 7F6 and 5D4 multiplets were determined from the luminescence spectra measured at 300 K.

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Публикация в журнале "Физика низких температур" Peschanskii A. V. Spectroscopic study of the TbAl3(BO3)4 single crystal: Raman and luminescence spectroscopy [Текст] / A. V. Peschanskii, A. Y. Glamazda, I. A. Gudim // Физ. низких температур. - 2020. - Т. 46 Вып. 12.- С.1437-1445

Держатели документа:
Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine.
RAS, Siberian Branch, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Glamazda, A. Yu.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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15.

Peschanskii, A. V.
Spectroscopic study of the TbAl3(BO3)4 single crystal: Raman and luminescence spectroscopy / A. V. Peschanskii, A. Y. Glamazda, I. A. Gudim // Физ. низких температур. - 2020. - Т. 46, Вып. 12. - С. 1437-1445. - Cited References: 20 . - ISSN 0132-6414. - ISSN 1816-0328

Переводная версия Peschanskii A. V. Spectroscopic study of the TbAl3(BO3)4 single crystal: Raman and luminescence spectroscopy [Текст] / A. V. Peschanskii, A. Y. Glamazda, I. A. Gudim // Low Temp. Phys. - 2020. - Vol. 46 Is. 12.- P.1223-1230

16.

Synthesis, crystal structure, and physicochemical properties of Bi4-xPrxTi3O12 (x=0.4, 0.8, 1.2, 1.6) solid solutions / L. T. Denisova, M. S. Molokeev, Y. F. Kargin [et al.] // Inorg. Mater. - 2021. - Vol. 57, Is. 9. - P. 919-928, DOI 10.1134/S002016852109003X. - Cited References: 40 . - ISSN 0020-1685. - ISSN 1608-3172

РУБ Materials Science, Multidisciplinary
Рубрики:
BI4-XRXTI3O12 R-X
   HEAT-CAPACITY
   AURIVILLIUS PHASES
   PR
   ND
   BI4TI3O12
Кл.слова (ненормированные):
bismuth titanates -- solid-state synthesis -- crystal structure -- luminescence -- high-temperature heat capacity -- phase transition
Аннотация: Bi4–xPrxTi3O12 (x = 0.4, 0.8, 1.2, 1.6) solid solutions have been prepared by solid-state reactions, via multistep firing of stoichiometric mixtures of their constituent oxides in air at temperatures from 1003 to 1323 K. Their crystal structure has been determined using X-ray diffraction, and their luminescence spectra have been measured at room temperature. High-temperature heat capacity of polycrystalline substituted bismuth titanate samples has been determined by differential scanning calorimetry. The Cp(T) curves of the solid solutions with x = 0.4 and 0.8 have extrema related to phase transitions. Experimental data have been used to calculate the main thermodynamic functions of the solid solutions.

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Публикация на русском языке Синтез, кристаллическая структура и физико-химические свойства твердых растворов Bi4-xPrxTi3O12 (x = 0.4, 0.8, 1.2, 1.6) [Текст] / Л. Т. Денисова, М. С. Молокеев, Ю. Ф. Каргин [и др.] // Неорган. матер. - 2021. - Т. 57 № 9. - С. 968-977

Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Fed Res Ctr, Siberian Branch, Kirensky Inst Phys,Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Baikov Inst Met & Mat Sci, Moscow 119991, Russia.

Доп.точки доступа:
Denisova, L. T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kargin, Yu F.; Gerasimov, V. P.; Герасимов, Виктор Петрович; Krylov, A. S.; Крылов, Александр Сергеевич; Aleksandrovskii, A. S.; Александровский, Александр Сергеевич; Chumilina, L. G.; Denisov, V. M.; Vasil'ev, G. V.; Васильев Г. В.
}
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17.

Synthesis, crystal structure, and thermal properties of substituted titanates Bi2Pr2Ti3O12 and Bi2Nd2Ti3O12 / L. T. Denisova, M. S. Molokeev, N. A. Galiakhmetova [et al.] // Phys. Solid State. - 2021. - Vol. 63. Is. 8. - P. 1159-1164, DOI 10.1134/S1063783421080084. - Cited References: 39. - This study was carried out in part within the state assignment for the Siberian Federal University, project no. FSRZ-2020-0013 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
BI4-XRXTI3O12 R-X
   PHASE-EQUILIBRIA
   HEAT-CAPACITY
   ND
   BI4TI3O12
   PR
Кл.слова (ненормированные):
substituted bismuth titanate -- solid-state synthesis -- crystal structure -- high-temperature heat capacity -- thermodynamic functions
Аннотация: Titanates Bi2Pr2Ti3O12 and Bi2Nd2Ti3O12 have been obtained by the solid-phase synthesis using sequential annealing of the Bi2O3, Nd2O3, Pr6O11, and TiO2 stoichiometric mixtures in air at temperatures of 1003–1323 K. Their crystal structure has been established by X-ray diffractometry and the high-temperature heat capacity has been determined by differential scanning calorimetry. Based on the experimental Cp = f(T) data, the main thermodynamic functions have been calculated.

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Публикация на русском языке Синтез, кристаллическая структура и теплофизические свойства замещенных титанатов Bi2Pr2Ti3O12 и Bi2Nd2Ti3O12 [Текст] / Л. Т. Денисова, М. С. Молокеев, Н. А. Галиахметова [и др.] // Физ. тверд. тела. - 2021. - Т. 63 Вып. 8. - С. 1056-1061

Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Denisova, L. T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Galiakhmetova, N. A.; Denisov, V. M.; Vasil'ev, G. V.; [FSRZ-2020-0013]
}
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18.

    Magnetic and transport properties of Gd(0.9)A(0.1)CoO(3-delta) (A = Ba, Sr) / N. V. Kazak [et al.] // J. Magn. Magn. Mater. - 2009. - Vol. 321, Is. 9. - P. 1266-1271, DOI 10.1016/j.jmmm.2008.11.087. - Cited Reference Count: 31. - Гранты: This study was supported by the Rosnauka (Project no. MK-4278.2008.2), Russian Foundation for Basic Research (Project no. 08-02-90708 mob_st) and "Strongly correlated electrons'' program of the Department of Physical Sciences of RAS. - Финансирующая организация: Rosnauka [MK-4278.2008.2]; Russian Foundation for Basic Research [08-02-90708 mob_st]; "Strongly correlated electrons'' program of the Department of Physical Sciences of RAS . - ISSN 0304-8853
Рубрики:
PEROVSKITE
   PR
   LA
   EU
   ND
   LN
   TRANSITION
   SPIN
   GD
   SM
Кл.слова (ненормированные):
Perovskite structure -- Doped cobaltite -- Magnetic susceptibility -- Metal-insulator transition -- Doped cobaltite -- Magnetic susceptibility -- Metal-insulator transition -- Perovskite structure -- Antiferromagnetism -- Barium -- Cobalt compounds -- Electric conductivity -- Ferromagnetic materials -- Ferromagnetism -- Gadolinium -- Magnetic susceptibility -- Metal insulator boundaries -- Oxide minerals -- Paramagnetic materials -- Perovskite -- Phase separation -- Semiconductor insulator boundaries -- Transport properties -- Antiferromagnetic -- Doped cobaltite -- Doped samples -- Electrical conductivity measurements -- Ferromagnetic transitions -- Insulator-metal transitions -- Magnetic and transport properties -- Magnetic behaviors -- Perovskite structure -- Temperature ranges -- Transport datum -- X- ray diffractions -- Metal insulator transition
Аннотация: The X-ray diffraction, magnetization and electrical conductivity measurements for Gd(0.9)A(0.1)CoO(3-delta) (A = Ba, Sr) have been made. The complicated magnetic behavior, including the paramagnetic-ferromagnetic-antiferromagnetic and paramagnetic-ferromagnetic transitions, was found for Ba- and Sr-doped samples. The gradual insulator-metal transitions were observed in a wide temperature range T = 600-800 K. The complex magnetic and transport data could be explained on the basis of the structural phase separation. (C) 2009 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660074, Russia
Univ Guadalajara, CUCEI, Dept Fis, Guadalajara 44430, Jalisco, Mexico
Siberian Fed Univ, Inst Nat & Humanitary Res, Krasnoyarsk 660041, Russia
AA Galkin Donetsk Phystech Natl Acad Sci Ukraine, UA-83114 Donetsk, Ukraine

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Ivanova, N.B.; Pashkevich, Yu. G.; Michel, C.R.; Bondarenko, G. V.; Бондаренко, Геннадий Васильевич
}
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