PRESNIAKOV, Igor A.; RUSAKOV, Viyacheslav S.; DEMAZEAU, Gérard; SOBOLEV, Alexey V.; GLAZKOVA, Ya. S.; GUBAIDULINA, Tatyana V.; GAPOCHKA, M. A.; VOLKOVA, O. S.; VASILIEV, A. N.

doi:10.1103/PhysRevB.85.024406

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PRESNIAKOV, Igor A.
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [Moscou] [MSU]

RUSAKOV, Viyacheslav S.
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [Moscou] [MSU]

DEMAZEAU, Gérard
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2012, vol. 85, n° 2, p. 024406

American Physical Society

Résumé en anglais

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.< Réduire

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Magnetism

Mössbauer spectroscopy

Inorganic compounds

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Magnetic exchange interactions and supertransferred hyperfine fields at 119Sn probe atoms in CaCu3Mn4O12

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