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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Platunov M. S., Knyazev Yu. V., Moshkina E. M., Gavrilkin S. Yu., Bayukov O. A., Gorev M. V., Pogoreltsev E. I., Zeer G. M., Zharkov S. M., Ovchinnikov S. G.
Заглавие : Fe-induced enhancement of antiferromagnetic spin correlations in Mn2−xFexBO4
Место публикации : J. Magn. Magn. Mater. - 2018. - Vol. 452. - P.90-99. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2017.12.037
Примечания : Cited References: 34. - This study was supported in part by the grants of: The Council for Grants of the President of the Russian Federation (project nos. SP-938.2015.5, NSh-7559.2016.2), the Russian Foundation for Basic Research (project nos. 16-32-60049 mol_a_dk, 16-32-00206 mol_a, 17-02-00826-a, 16-32-50058). The magnetic measurements were carried out in the Shared Facility Centre of P. N. Lebedev Physical Institute of RAS.
Ключевые слова (''Своб.индексиров.''): sro spin correlations--spin-glass--rehac--magnetic frustrations
Аннотация: Fe substitution effect on the magnetic behavior of Mn2−xFexBO4 (x = 0.3, 0.5, 0.7) warwickites has been investigated combining Mössbauer spectroscopy, dc magnetization, ac magnetic susceptibility, and heat capacity measurements. The Fe3+ ions distribution over two crystallographic nonequivalent sites is studied. The Fe introduction breaks a long-range antiferromagnetic order and leads to onset of spin-glass ground state. The antiferromagnetic short-range-order spin correlations persist up to temperatures well above TSG reflecting in increasing deviations from the Curie-Weiss law, the reduced effective magnetic moment and “missing” entropy. The results are interpreted in the terms of the progressive increase of the frustration effect and the formation of spin-correlated regions.
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