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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Platunov M. S., Ivanova N. B., Knyazev Yu. V., Bezmaternykh L. N., Eremin E. V., Vasil'ev A. D., Bayukov O. A., Ovchinnikov S. G., Velikanov D. A., Zubavichus Y. V.
Заглавие : Crystal structure and magnetization of a Co3B2O6 single crystal
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2013. - Vol. 117, Is. 1. - P.94-107. - ISSN 1063-7761, DOI 10.1134/S1063776113060186
Примечания : Cited References: 43. - The synchrotron measurements were performed at the Kurchatov Center of Synchrotron Radiation and Nanotechnologies (state contract no. 16.552.11.7055).This work was supported by the Russian Foundation for Basic Research (project nos. 12-02-00175-a, 12-02-90410-Ukr_a, 12-02-31543mol_a, 13-02-00958-a), the President of the Russian Federation (grant no. NSh-1044.2012.2), the Siberian Branch of the Russian Academy of Sciences (project no. 38), the Ministry of Education and Science of the Russian Federation (project no. 8365), and an integration project of SO RAN-NAN of Belarus (project no. 29).
Предметные рубрики: ABSORPTION FINE-STRUCTURE
NICKEL ORTHOBORATE
RAY
GDFE3(BO3)(4)
LUDWIGITE
NI3(BO3)2
NI3B2O6
SPECTRA
Аннотация: The crystal structure and magnetic properties of Co3B2O6 single crystals are studied. Orthorhombic symmetry with space group Pnnm is detected at room temperature. The measurements of static magnetization and dynamic magnetic susceptibility reveal two magnetic anomalies at T (1) = 33 K and T (2) = 10 K and an easy-axis magnetic anisotropy. The effective magnetic moment indicates a high-spin state of the Co2+ ion. A spin-flop transition is found at low temperatures and H (sf) = 23 kOe. EXAFS spectra of the K-edge absorption of Co are recorded at various temperatures, the temperature-induced changes in the parameters of the local environment of cobalt are analyzed, and the effective Co-Co and Co-O distances are determined. The magnetic interactions in the crystal are analyzed in terms of an indirect coupling model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Platunov M. S., Knyazev, Yu. V., Ivanova, N. B., Bayukov O. A., Vasiliev A. D., Bezmaternykh L. N., Nizhankovskii, V. I., Gavrilkin, S. Yu., Lamonova, K. V., Ovchinnikov S. G.
Заглавие : Uniaxial anisotropy and low-temperature antiferromagnetism of Mn2BO4 single crystal
Коллективы : Russian Foundation for Basic Research [13-02-00958, 13-02-00358, 14-02-31051-mol-a], Council for Grants of the President of the Russian Federation [NSh-2886.2014.2, SP-938.2015.5], program of Foundation for Promotion of Small Enterprises in Science and Technology [5468GU1/2014]
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2015. - Vol. 393. - P.316-324. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2015.05.081. - ISSN 18734766(eISSN)
Примечания : Cited References:33. - The authors wish to thank to Prof. M.V.Gorev and Prof J. Bartolome for fruitful discussions, Russian Foundation for Basic Research (Projects no13-02-00958, 13-02-00358, and 14-02-31051-mol-a), Council for Grants of the President of the Russian Federation (Project nos. NSh-2886.2014.2, and SP-938.2015.5). The work of one of coauthors (M.S.P.) was supported by the program of Foundation for Promotion of Small Enterprises in Science and Technology (Grant number 5468GU1/2014) ("UMNIK" program).
Предметные рубрики: MAGNETIC-PROPERTIES
WARWICKITE
OXYBORATE
PARAMETERS
LUDWIGITE
Ключевые слова (''Своб.индексиров.''): antiferromagnets--oxides--magnetic anisotropy--exchange interactions
Аннотация: The Mn2BO4 single crystals have been grown by the flux technique. A careful study of the crystal structure and magnetic properties have been carried out The antiferromagnetic transition at T-N=26 K has been traced through the dc magnetization and specific heat temperature dependences. Magnetic uniaxial anisotropy has been found with easy axis magnetization lying in the ab-plane. The obtained value of effective magnetic moment is assigned to the non-quenched orbital moment of Jahn-Teller Mn3+ ions. The discussion of magnetic properties is based on the superexchange interaction calculations. (C) 2015 Elsevier B.V. All rights reserved.
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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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