RUSAKOV, Viyacheslav S.; PRESNIAKOV, Igor; SOBOLEV, Alexey; GUBAIDULINA, Tatyana V.; BARANOV, Alexey; DEMAZEAU, Gérard; VESELOVA, K. M.; VOLKOVA, O. S.; VASILIEV, A. N.

doi:10.1134/S1063776109040086

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RUSAKOV, Viyacheslav S.
Chair of Radiochemistry, Department of Chemistry

PRESNIAKOV, Igor
Chair of Radiochemistry, Department of Chemistry

SOBOLEV, Alexey
Chair of Radiochemistry, Department of Chemistry

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Journal of Experimental and Theoretical Physics (JETP) / Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki. 2009, vol. 108, n° 4, p. 605-615

MAIK Nauka/Interperiodica

Résumé en anglais

The manganite CaCu3Mn4O12 doped by 119Sn atoms (about 1 at % with respect to Mn atoms) is studied by Mössbauer 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 119Sn 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.< Réduire

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Mössbauer spectroscopy

Solid solution

Magnetism

Perovskite

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Magnetic hyperfine interactions of <sup>119</sup>Sn probe atoms in the binary perovskite CaCu<sub>3</sub>Mn<sub>4</sub>O<sub>12</sub>

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