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Magnetic exchange interactions and supertransferred hyperfine fields at 119Sn probe atoms in CaCu3Mn4O12статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Presniakov I.A., Rusakov V.S., Demazeau G., Sobolev A.V., Glazkova Ya S., Gubaidulina T.V., Gapochka A.M., Volkova O.S., Vasiliev A.N.
- Журнал: Physical Review B
- Том: 85
- Год издания: 2012
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 024406
- Последняя страница: 024406
- DOI: 10.1103/PhysRevB.85.024406
- Аннотация: The double manganite CaCu3Mn4O12 doped with 119Sn atoms (∼1 at.% with respect to manganese atoms) was studied by use of Mössbauer spectroscopy. Formally tetravalent Sn4+ ions substitute for isovalent manganese ions in the octahedral (Mn4+O6) polyhedra. The covalency effects on the magnetic interactions like superexchange in Cu2+-O-Mn4+ and Mn4+-O-Mn4+ bonds and supertransferred hyperfine interactions of the 119Sn probe atoms in the manganite structure are discussed. Using a semiquantitative nearest-neighbor cluster model relating the hyperfine magnetic field on the 119Sn nuclei (HSn = 105 kOe at T = 77 K) to covalency parameters and angle characterizing the Sn-O-M (M = Cu, Mn) bonds, it has been shown how such an analysis of supertransferred hyperfine interactions of tin probe ions can get fruitful information about strength and sign of the superexchange interactions between Mn4+ and Cu2+ magnetic ions. A consistent description of the results in the framework of the Weiss molecular field model considering the specific local environment of tin atoms has made it possible to estimate exchange integrals: JCuMn = −51.1 ± 0.3 K and JMnMn = −0.6 ± 0.2 K.
- Добавил в систему: Волкова Ольга Сергеевна