Magnetic hyperfine interactions of Sn-119 probe atoms in the binary perovskite CaCu3Mn4O12статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The manganite CaCu3Mn4O12 doped by Sn-119 atoms (about 1 at % with respect to Mn atoms) is studied by Mossbauer spectroscopy. The introduction of diamagnetic tin atoms is found not to affect the structure of the manganite. Tetravalent tin atoms are shown to substitute for the isovalent manganese atoms that are located in an octahedral oxygen surrounding. The cluster method of molecular orbitals is used to calculate the contributions of Mn4+ and Cu2+ cations that belong to different structural sublattices to the hyperfine magnetic field at Sn-119 nuclei (H (Sn) = 105 kOe at T = 77 K). These partial contributions are analyzed, and the intrasublattice Mn4+-O-Mn4+ exchange interactions are found to play a significant role in the formation of the magnetic structure of the manganite.