Тип публикации: статья из журнала
Год издания: 2023
Идентификатор DOI: 10.21883/pss.2023.02.55410.512
Аннотация: <jats:p> The content of metal ions and their valence state for three Ni<jats:sub>x</jats:sub>Cu<jats:sub>y</jats:sub>Mn<jats:sub>3-x-y</jats:sub>BO<jats:sub>5</jats:sub> compositions were estimated by EXAFS and XANES spectroscopy methods. In all three compositions, the copper y content did not exceed 0.25; in the third composition,Показать полностьюsome manganese ions entered the compound not only in the trivalent, but also in the divalent state. A detailed study of the magnetic properties showed that two magnetic transitions are observed in all compositions: one in the region of 60-75 K, and the second in the region of 10 K. Based on the exchange interactions calculated within the framework of the empirical model, the magnetic ordering temperatures for two- and three-lattice magnets were determined and it was assumed that the magnetic transition in the region of 60-75 K is associated with the ordering of magnetic moments in positions 2 and 3. Keywords: ludwigites, magnetic phase transition, indirect exchange interactions. </jats:p>
Журнал: Physics of the Solid State
Выпуск журнала: Т. 65, № 2
Номера страниц: 260
ISSN журнала: 10637834
Место издания: Saint Petersburg
Издатель: Физико-технический институт им. А.Ф. Иоффе РАН