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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Bezmaternykh L. N., Velikanov D. A., Vorotynov A. M., Bayukov O. A., Schneider M.
Заглавие : Magnetic Properties of Single Crystals of Ludwigites Cu2MBO5 (M = Fe3+, Ga3+)
Разночтения заглавия :авие SCOPUS: Magnetic properties of single crystals of ludwigites Cu2MBO5 (M = Fe3+, Ga3+)
Место публикации : Phys. Solid State. - 2009. - Vol. 51, Is. 10. - P.2077-2083. - ISSN 1063-7834, DOI 10.1134/S106378340910014X
Примечания : Cited References: 18
Предметные рубрики: FE3O2BO3
BEHAVIOR
Аннотация: High-quality single crystals of ludwigites Cu2MBO5 (M = Fe3+, Ga3+) have been grown, and the magnetic, resonance, and Mossbauer studies have been performed. It is established that the Cu2FeBO5 and Cu2GaBO5 compounds are antiferromagnets with Neel temperatures of 32 and 3.4 K, respectively. A model of the magnetic structure of the compounds is proposed. It is shown that the magnetic properties of the ludwigites are substantially dependent on the degree of ion distribution over crystallographic positions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Moshkina E. M., Nazarenko I. I., Seryotkin Yu. V., Nepijko S. A., Ksenofontov V., Medjanik K., Veligzhanin A. A., Bezmaternykh L. N.
Заглавие : Crystal growth, structure, magnetic properties and theoretical exchange interaction calculations of Cu2MnBO5
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 420. - P.309-316. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2016.07.019
Примечания : Cited References: 35. - X-ray diffraction experiment was carried out at the Centre on Molecular Design and Ecologically Safe Technologies at the Novosibirsk State University. The reported study was funded by Russian Foundation for Basic Research (RFBR) and Government of Krasnoyarsk Territory according to the research project No. 16-42-243028.
Предметные рубрики: SPIN-GLASS BEHAVIOR
SINGLE-CRYSTALS
SUPEREXCHANGE INTERACTIONS
LUDWIGITE
DIELECTRICS
CO3B2O6NI3B2O6
WARWICKITES
FE3O2BO3
IFEFFIT
NI3B2O6
Ключевые слова (''Своб.индексиров.''): oxyborates--ludwigites--xmcd--exafs--magnetism
Аннотация: Single crystals of ludwigite Cu2MnBO5 were synthesized by flux growth technique. The detailed structural and magnetic characterizations of the synthesized samples have been carried out. The cations composition of the studied crystal was determined using X-ray diffraction and EXAFS technique, the resulting composition differ from the content of the initial Mn2O3–CuO components of the flux. Magnetic susceptibility measurements and the calculations of the exchange integrals in frameworks of indirect coupling model revealed that monoclinic distortions strongly affect exchange interactions and appearance of magnetic ordering phase at the temperature T=93 K. The hypothesis of the existence of several magnetic subsystems was supposed. © 2016 Elsevier B.V.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N.V., Ivanova N.B., Rudenko V.V., Vasil'ev A.D., Velikanov D.A., Ovchinnikov S.G.
Заглавие : Low-field magnetization of ludwigites Co3O2BO3 and Co3-x Fe (x) O2BO3 (x a parts per thousand 0.14)
Коллективы : Federal Agency for Science and Innovation [MK-4278.2008.2]
Разночтения заглавия :авие SCOPUS: Low-field magnetization of ludwigites Co3O2BO 3 and Co3 - X Fe x O2BO3 (x ≈ 0.14)
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 5. - P966-969. - ISSN 1063-7834, DOI 10.1134/S1063783409050138
Примечания : Cited References: 17. - This study was supported by the Branch of General Physics and Astronomy of the Russian Academy of Sciences (program "Strongly Correlated Electrons") and the Federal Agency for Science and Innovation (project no. MK-4278.2008.2).
Предметные рубрики: ELECTRICAL-PROPERTIES
FE3O2BO3
BEHAVIOR
Аннотация: Ludwigite single crystals of compositions Co3O2BO3 and Co3 - x Fe (x) O2BO3 (x a parts per thousand 0.14) have been synthesized. The crystal structure is investigated at room temperature, and the magnetization is studied in the temperature range T = 4.2-100 K in magnetic fields of up to 600 Oe. The orthorhombic symmetry is revealed, and the unit cell parameters are determined. A number of features are established for the temperature dependence of the magnetization. In unsubstituted Co3O2BO3, two magnetic transitions are found at T (C1) = 43 K and T (C2) = 15 K. At temperatures below 40 K, spin-glass state is revealed. Substitution of iron ions for cobalt ions leads to a noticeable shift in the magnetic transitions toward the high-temperature range: T (C1) = 83 K and T (C2) = 74 K. A ferromagnetic ordering of the P type is found in the Co3 - x Fe (x) O2BO3 (x a parts per thousand 0.14) compound.
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