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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova N. B., Kazak N. V., Markov V. V., Ovchinnikov S. G., Rudenko V. V., Abd-Elmeguid M. M.
Заглавие : Analysis of the electrical and optical properties of VBO3 single crystals and Fe1-xVxBO3 solid solutions on the basis of a many-electron model of energy band structure
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 8. - P1462-1468. - ISSN 1063-7834, DOI 10.1134/1.1788779
Примечания : Cited References: 32. - One of the authors (M.M.A.) would like to thank the Deutsche Forschungsgemeinschaft (SFB608) for financial support. This study was supported by the Russian Foundation for Basic Research (project no. 03-02-16286), the program "Integration" (project no. B0017), and the program of the Division of Physical Sciences of the Russian Academy of Sciences "Strongly Correlated Electrons"
Предметные рубрики: MAGNETIC-PROPERTIES
CALCITE STRUCTURE
PHASE-TRANSITION
FERRIC BORATE
HIGH-PRESSURE
FEBO3
FE1-XCRXBO3
FERROMAGNET
MOSSBAUER
SPECTRA
Аннотация: A many-electron model of the energy band structure of VBO3 and of Fe1 - xVxBO3 solid solutions is proposed with strong electron correlations taken into account. Experimental optical absorption spectra and data on the resistivity are discussed in the framework of the suggested model. Variation in the magnetic and electronic properties of VBO3 and Fe1 - xVxBO3 under high pressure is predicted. For VBO3, a Mott-Hubbard (insulator-metal) transition is expected in the high-pressure phase. In Fe1 - xVxBO3 solid solutions, a nontrivial variation in the properties is predicted, leading to the appearance of a different magnetic state. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gokhfeld Yu. S., Belskaya N. A., Kazak N. V., Velikanov D. A., Gromilov S. A., Sukhikh A. S., Rudenko V. V., Ovchinnikov S. G.
Заглавие : Charge ordering and magnetiс transitions in Fe1.75V0.25BO4 warwickite
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. H: Magnetism of strongly correlated electron systems. - Ст.H.P12. - P.98-99. - ISBN 978-5-94469-051-7
Примечания : Cited References: 7. - This work was supported by RFBR №20-02-00559, №21-52-1203
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Ivanova N. B., Rudenko V. V., Ovchinnikov S. G., Vasil'Ev A. D., Knyazev Yu. V.
Заглавие : Conductivity study of Co3O2BO3 and Co 3-xFexO2BO3 oxyborates
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Solid State Phenomena. - 2009. - Vol. 152-153. - С. 104-107. - ISSN 10120394 (ISSN); 390845168X (ISBN); 9783908451686 (ISBN), DOI 10.4028/www.scientific.net/SSP.152-153.104
Ключевые слова (''Своб.индексиров.''): doped cobaltite--electrical conductivity--ludwigite--variable-range hopping--crystal structure--electric conductivity--magnetic materials--single crystals--crystal structure--electric conductivity--magnetic materials--magnetism--single crystals--electrical conductivity--electrical resistivity--experimental data--mott variable-range hopping--oxyborates--temperature regions--variable-range hopping--doped cobaltite--ludwigite--variable range hopping--cobalt--cobalt
Аннотация: Single crystals of cobalt oxyborates Co3O2BO 3 and Co3-xFexO2BO3 were synthesized. The crystal structure and electric properties were investigated. The difference in the electrical resistivity behaviors was found. For parent Co3O2BO3 nor simple activation law, nor Mott variable range hopping (VRH) are acquirable to describe the experimental data in wide temperature region. In contrast for Co3-xFex O 2BO3 Mott's variable-range hopping conductivity clearly dominates.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorotynov A. M., Vasiliev A. D., Rudenko V. V., Bayukov O. A., Velikanov D. A., Ovchinnikov S. G., Vorotynova O. V.
Заглавие : Crystal and magnetic properties of the new copper-sodium borate CuNaB3O6 · 0.842H2O
Место публикации : J. Exp. Theor. Phys.: Pleiades Publishing, 2014. - Vol. 119, Is. 3. - P.532-541. - ISSN 1063-7761, DOI 10.1134/S1063776114080202. - ISSN 1090-6509
Примечания : Cited References: 20
Предметные рубрики: ALPHA'-NaV2O5
CuGeO3
Аннотация: A new compound CuNaB3O6 · 0.842H2O was grown for the first time. Its crystal structure, magnetic susceptibility, and magnetic resonance properties are presented. It was proposed that CuNaB3O6 · 0.842H2O is a spin-Peierls magnet with the transition temperature T SP - 128 K and a ladder spin structure. The possibility of a structural phase transition at T ˂ T SP is predicted.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorotynov A. M., Vasiliev A. D., Rudenko V. V., Bayukov O. A., Velikanov D. A., Ovchinnikov S. G., Vorotynova O. V.
Заглавие : Crystal and magnetic properties of the new copper-sodium borate CuNaB3O6 · 0.842H2O
Место публикации : Журн. эксперим. и теор. физ.: Наука, 2014. - Т. 146, Вып. 3. - С.607-617. - ISSN 0044-4510, DOI 10.7868/S004445101409020X
Примечания : Библиогр.: 20 назв.
Аннотация: A new compound CuNaB3O6 · 0.842H2O was grown for the first time. Its crystal structure, magnetic susceptibility, and magnetic resonance properties are presented. It was proposed that CuNaB3O6 · 0.842H2O is a spin-Peierls magnet with the transition temperature T SP ∼ 128 K and a ladder spin structure. The possibility of a structural phase transition at T ˂ T SP is predicted.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kazak N. V., Bartolome J., Rudenko V. V., Vasil'ev A. D., Bayukov O. A., Knyazev Yu.V., Platunov M. S.
Заглавие : Distribution of Fe ions ludwigite structure of Co3-xFexO2BO3
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Ekaterinburg, 2010. - P.378
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Knyazev Yu. V., Bayukov O. A., Shustin M. S., Balatskii D. V., Bel’skaya N. A., Gromilov S. A., Sukhikh A. S., Rudenko V. V., Kazak N. V.
Заглавие : Effect of electron delocalization on the “recoil-free” absorption of γ-quants in Fe1.75V0.25BO4 warwickite
Коллективы : International Baltic Conference on Magnetism: focus on nanobiomedicine and smart materials, Балтийский федеральный университет им. И. Канта
Место публикации : 4th International Baltic Conference on Magnetism (IBCM 2021): Book of abstracts. - 2021. - P.139
Примечания : Cited References: 2
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Bayukov O. A., Shustin M. S., Balatskii D. V., Bel’skaya N. A., Gromilov S. A., Sukhikh A. S., Rudenko V. V., Kazak N. V.
Заглавие : Effect of electron delocalization on the “recoil-free” absorption of γ-Ray photons in Fe1.75V0.25BO4 warwickite
Место публикации : JETP Letters. - 2021. - Vol. 113, Is. 4. - P.279-284. - ISSN 00213640 (ISSN), DOI 10.1134/S002136402104010X
Примечания : Cited References: 42. - This work was supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-2339.2020.2) and by the Russian Foundation for Basic Research (project no. 20-02-00559-a)
Аннотация: Mössbauer spectroscopy is used to study the characteristic features of the crystal lattice dynamics in powdered single crystals of Fe1.75V0.25BO4 warwickite in the temperature range of 4.2–505 K. The Debye temperature (ΘD = 260 K) is determined from the temperature dependence of the probability of the Mössbauer effect in the thin absorber approximation. It is found that the electron delocalization related to the fast electronic transfer between neighboring Fe3+ and Fe2+ cations takes place in the temperature range of 260−505 K. As a result, iron cations exhibiting the mixed valence (Fe2.5+) arise. This process correlates with a change in the elastic properties of the lattice. Such correlation leads to a sharp decrease in the recoil-free absorption of γ‑ray photons by the crystal lattice in the range of 260–400 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorotynov A. M., Rudenko V. V., Ovchinnikov S. G., Molokeev M. S.
Заглавие : Electron Paramagnetic Resonance of Cr3+ Ions in ABO(3) (A = Sc, In, Ga) Diamagnetic Crystals
Место публикации : J. Exp. Theor. Phys. - 2018. - Vol. 127, Is. 6. - P.1067-1073. - ISSN 1063-7761, DOI 10.1134/S1063776118120245. - ISSN 1090-6509(eISSN)
Примечания : Cited References: 14
Предметные рубрики: SPIN-RESONANCE
PAIRS
ANISOTROPY
VBO3
Аннотация: A magnetic resonance method is applied to the investigation of a number of isostructural diamagnetic compounds ABO3 (A = Sc, In, and Ga) with small additions of Cr3+ ions (S = 3/2) sufficient to observe single-ion and pair spectra. It is shown that the resonance spectra for isolated Cr3+ ions can be described to a good accuracy by the ordinary axial spin Hamiltonian for 3d ions in octahedral oxygen environment. The parameters of the spin Hamiltonian are determined for single Cr3+ ion and Cr3+–Cr3+ pair. Lattice distorsions of the parent ABO3 crystals caused by the Cr3+ impurities is discussed.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorotynov A. M., Ovchinnikov S. G., Rudenko V. V., Vorotynova O. V.
Заглавие : Electron paramagnetic resonance of Cr3+ ions in ABO3 (A = Sc, Lu, In) diamagnetic crystals
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 122, Is. 4. - P.734-737. - ISSN 1063-7761, DOI 10.1134/S1063776116040087. - ISSN 1090-6509(eISSN)
Примечания : Cited References:11
Предметные рубрики: Spin-resonance
Pairs
Anisotropy
CrBO3
VBO3
Аннотация: A magnetic resonance method is applied to the investigation of a number of isostructural diamagnetic compounds ABO3 (A = Sc, Lu, In) with small additions of Cr3+ ions (S = 3/2) sufficient to observe single-ion spectra. It is shown that the resonance spectra for isolated Cr3+ ions can be described to a good accuracy by the ordinary axial spin Hamiltonian for 3d ions in octahedral oxygen environment. The parameters of the spin Hamiltonian are determined. It is established that Cr3+ ions in these crystals are characterized by easy-axis-type anisotropy.
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11.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vorotynov A. M., Rudenko V. V., Ovchinnikov S. G., Vorotynova O. V.
Заглавие : Electron-spin resonance of Cr3+ ions in ABO3 (A=In, Sc, Lu) crystals
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.P5.12. - P.284. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 2
Ключевые слова (''Своб.индексиров.''): magnetic resonance--single-ion anisotropy
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kazak N. V., Knyazev Yu. V., Platunov M. S., Vasiliev A. D., Bezmaternykh L. N., Rudenko V. V., Ivanova N. B., Bartolome J., Arauzo A., Ovchinnikov S. G.
Заглавие : Electronic and magnetic states of the Co and Fe in ludwigite system Co3бxFexBO5
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.]; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст.H.04. - P.57-58. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 6. - The work was supported by Russian Foundation for Basic Research (project nos. 17-02-00826-a).
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Gavriliuk A. G., Ovchinnikov S. G., Lyubutin I. S., Edel'man I. S., Rudenko V. V.
Заглавие : Evolution of the optical absorption spectra and electronic structure of the VBO3 crystal under high pressures
Коллективы : Russian Foundation for Basic Research [07-02-00490a, 08-02-00897a, 08-02-90708 mob_st, 09-02-00171a, 07-02-00226]; Federal Agency for Science and Innovation [MK-4278.2008.2, 01.164.12.HB11]; Russian Academy of Sciences
Место публикации : J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 3. - P.455-465. - ISSN 1063-7761, DOI 10.1134/S1063776109090118
Примечания : Cited References: 27. - We would like to thank A. D. Vasil'ev for performing the X-ray diffraction investigations.This study was supported by the Russian Foundation for Basic Research (project nos. 07-02-00490a, 08-02-00897a, 08-02-90708 mob_st, 09-02-00171a, and 07-02-00226), the Federal Agency for Science and Innovation (Rosnauka) (project no. MK-4278.2008.2, contract no. 01.164.12.HB11), and the Branch of Physical Sciences of the Russian Academy of Sciences within the framework of the program "Strongly Correlated Electrons."
Предметные рубрики: BAND-STRUCTURE
PHASE-TRANSITION
FEBO3
FE1-XVXBO3
STATE
MODEL
Ключевые слова (''Своб.индексиров.''): charge-transfer excitations--d-d transitions--ferromagnetic semiconductor--fundamental absorption edge--high pressure--optical absorption spectrum--absorption--boron--boron compounds--electronic properties--electronic structure--optical materials--oxygen--vanadium--light absorption
Аннотация: The evolution of optical absorption spectra of the ferromagnetic semiconductor VBO3 under high pressures up to 70 GPa has been investigated. It has been revealed that, below the fundamental absorption edge (E (g1) = 3.02 eV), the spectra exhibit a series of bands V1 (2.87 eV), V2 (2.45 eV), V3 (1.72 eV), and V4(1.21 eV) due to the d-d transitions in the V3+ ion and charge-transfer excitations. A model of the electronic structure of the VBO3 semiconductor has been constructed. This model combines the one-electron description of the s and p states of boron and oxygen and the many-electron description of the vanadium d states.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Potseluyko A. M., Ovchinnikov S. G., Alexandrovsky A. S., Chernov V. A., Rudenko V. V.
Заглавие : EXAFS study of Fe1-xVxBO3 system
Разночтения заглавия :авие SCOPUS: EXAFS study of Fe1 - x Vx BO3 system
Место публикации : Physica B: ELSEVIER SCIENCE BV, 2006. - Vol. 378-80: International Conference on Strongly Correlated Electron Systems (SECES 05) (JUL 26-30, 2005, Vienna, AUSTRIA). - P327-329. - ISSN 0921-4526, DOI 10.1016/j.physb.2006.01.119
Примечания : Cited References: 10
Предметные рубрики: MANY-ELECTRON MODEL
CALCITE STRUCTURE
BAND-STRUCTURE
FEBO3
VBO3
TRANSITION
CRBO3
Ключевые слова (''Своб.индексиров.''): strongly correlated electron systems--x-ray absorption spectra--transition-metal compounds--strongly correlated electron systems--transition-metal compounds--x-ray absorption spectra--absorption--atomic force microscopy--solid solutions--transition metal compounds--x ray analysis--strongly correlated electron systems--x-ray absorption spectra--iron compounds
Аннотация: The room-temperature EXAFS measurements have been made on FeBO3 and VBO3, as well as on Fe1-xVxBO3 series with concentration x=0.13,0.3, and 0.95. The first-shell Me-O bond lengths deduced from EXAFS have shown a compositional independence. It has been found that Fe1-xVxBO3 forms solid solutions with random distribution of Fe3+ and V3+ ions. (c) 2006 Elsevier B.V. All rights reserved.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Gizhevskii B. A., Kazak N. V., Rudenko V. V., Telegin A. V.
Заглавие : Experimental observation of the virtual electronic states of a mott-Hubbard insulator FeBO3 in infrared absorption spectra
Коллективы : Russian Foundation for Basic Research [07-02-00226, 09-02-00171-a, 09-02-90730]; Russian Federation; Young Scientists and Leading Scientific Schools [MK-4278.2008.2]; Branch of Physical Sciences, Russian Academy of Sciences (program "Strong Electron Correlations"); Siberian Branch and Ural Division, Russian Academy of Sciences
Место публикации : JETP Letters. - 2009. - Vol. 90, Is. 7. - P.519-523. - ISSN 0021-3640, DOI 10.1134/S0021364009190059
Примечания : Cited References: 17. - We are grateful to I. S. Edelman, Yu. P. Sukhorukov, V. F. Shabanov, and A. N. Vtyurin for discussions of the results. This work was supported by the Russian Foundation for Basic Research (project nos. 07-02-00226, 09-02-00171-a, and 09-02-90730-mob_st); by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-4278.2008.2); by the Branch of Physical Sciences, Russian Academy of Sciences (program "Strong Electron Correlations"); and by the Siberian Branch and Ural Division, Russian Academy of Sciences (integration project no. 40).
Предметные рубрики: BAND-STRUCTURE
PRESSURE
MODEL
VBO3
Аннотация: A number of new peaks close to the previously predicted energies of virtual electronic states [S.G. Ovchinnikov and V.N. Zabluda, Zh. Eksp. Teor. Fiz. 125, 150 (2004) [JETP 98, 135 (2004)]] have been observed in the absorption spectra of FeBO3 single crystals in the infrared range. The 0.27-eV peak was absent in the scheme presented in the work cited above and, to explain it, a multielectron theory taking into account the (2) T (2) low-spin term of the Fe3+ ion has been developed.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova N. B., Vasil'ev A. D., Velikanov D. A., Kazak N. V., Ovchinnikov S. G., Petrakovski G. A., Rudenko V. V.
Заглавие : Magnetic and electrical properties of cobalt oxyborate Co3BO5
Разночтения заглавия :авие SCOPUS: Magnetic and electrical properties of cobalt oxyborate Co 3BO5
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 4. - P651-653. - ISSN 1063-7834, DOI 10.1134/S1063783407040087
Примечания : Cited References: 13
Предметные рубрики: LUDWIGITES
Аннотация: Single crystals of cobalt oxyborate Co3BO5 are synthesized. The results of investigations into the structural, magnetic, and electrical properties are reported. It is found that Co3BO5 crystals exhibit two magnetic anomalies at T (1) = 17 K and T (2) = 45 K. The temperature dependence of the electrical resistivity is investigated. Deviations both from the activation law of variation in the electrical resistance and from the Mott variable-range hopping conduction are revealed.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev A. D., Bayukov O. A., Vasil'ev A. D., Velikanov D. A., Ivanova N. B., Kazak N. V., Ovchinnikov S. G., Abd-Elmeguid M. M., Rudenko V. V.
Заглавие : Magnetic and electrical properties of Fe1.91V0.09BO4 warwickite
Разночтения заглавия :авие SCOPUS: Magnetic and electrical properties of Fe1.91V 0.09BO4 warwickite
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2003. - Vol. 97, Is. 5. - P989-995. - ISSN 1063-7761, DOI 10.1134/1.1633954
Примечания : Cited References: 22. - This study was supported in part by the Russian Foundation for Basic Research (project no. 03-02-16286) and by the Federal Program “Integration” (project no. B0017)
Предметные рубрики: ELECTRONIC-STRUCTURE
CRYSTAL-STRUCTURE
FE2OBO3
CHAINS
FE2BO4
FEBO3
Ключевые слова (''Своб.индексиров.''): electric conductivity--magnetic variables measurement--magnetization--single crystals--hopping conductivity--warwickite--iron compounds
Аннотация: We have performed a complex investigation of the structure and the magnetic and electrical properties of a warwickite single crystal with the composition Fe1.91V0.09BO4 . The results of Mossbauer measurements at T = 300 K indicate that there exist "localized" (Fe2+, Fe3+) and "delocalized" (Fe2.5+) states distributed over two crystallographically nonequivalent positions. The results of magnetic measurements show that warwickite is a P-type ferrimagnet below T = 130 K. The material exhibits hopping conductivity involving strongly interacting electrons. The experimental data are analyzed in comparison to the properties of the initial (unsubstituted) Fe2BO4 warwickite. The entire body of data on the electric conductivity and magnetization are interpreted on a qualitative basis. (C) 2003 MAIK "Nauka / Interperiodica".
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova N. B., Bartolome J., Rudenko V. V., Platunov M. S.
Заглавие : Magnetic and electronic properties of cobaltites Gd1-xCaxCoO3
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Ekaterinburg, 2010. - P.377
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorotynov A. M., Ovchinnikov S. G., Rudenko V. V., Sudakov A. N.
Заглавие : Magnetic anisotropy of antiferromagnet (CH3)(4)NMnCl3
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2000. - Vol. 42, Is. 7. - P1313-1316. - ISSN 1063-7834, DOI 10.1134/1.1131384
Примечания : Cited References: 14
Предметные рубрики: EXCITATIONS
Аннотация: The parameters of the electron paramagnetic resonance (EPR) spectra of S ion pairs in diamagnetic crystals are analyzed. A relation between the spin Hamiltonian constants is established for solitary ions and pairs for (CH3)(4)NCdCl3:Mn2+ crystals. In contrast to solitary ions, an additional contribution (which is a linear function of the exchange field) to the "single-ion" spin Hamiltonian constants appears in the case of pairs. It is shown that anisotropic exchange mechanisms do not play a significant part in the formation of the axial constant of the spin Hamiltonian for this crystal. Some aspects of the method of studying "single-ion" anisotropy predicted by the two-ion model are developed with the help of an isostructural diamagnetic analog with impurity concentration of the paramagnetic ions of a magnetically concentrated substance sufficiently high for observing the EPR spectrum of the pairs. It is found that the microscopic quantities determined partially from the EPR spectra for pairs and solitary Mn2+ ions in (CH3)(4)NCdCl3 are in accord with the experimental value of the effective field for the (CH3)(4)NMnCl3 crystal anisotropy which can be described primarily by the dipole and "single-ion" mechanisms of the exchange origin. (C) 2000 MAIK "Nauka/Interperiodica".
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev A. D., Ivanova N. B., Kazak N. V., Ovchinnikov S. G., Rudenko V. V., Sosnin V. M.
Заглавие : Magnetic anisotropy of the VBO3 and CrBO3 transition-metal borates
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 2. - P287-291. - ISSN 1063-7834, DOI 10.1134/1.1553533
Примечания : Cited References: 16
Аннотация: Temperature and field dependences of the magnetization of VBO3 and CrBO3 single crystals with the magnetic field applied parallel and perpendicular to the (111) basal plane were measured. VBO3 was found to have a considerable uniaxial anisotropy with a field H-a approximate to 6.25 T. CrBO3 was shown to exhibit not only uniaxial but also hexagonal anisotropy. The experimental anisotropy constants were estimated, and their temperature dependences are presented. (C) 2003 MAIK "Nauka / Interperiodica".
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