Magnetic exchange interactions and supertransferred hyperfine fields at 119Sn probe atoms in CaCu3Mn4O12 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2012

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

Résumé

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.
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hal-00663175 , version 1 (26-03-2024)

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Igor A. Presniakov, Viyacheslav S. Rusakov, Gérard Demazeau, Alexey V. Sobolev, Ya. S. Glazkova, et al.. Magnetic exchange interactions and supertransferred hyperfine fields at 119Sn probe atoms in CaCu3Mn4O12. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2012, 85 (2), pp.024406. ⟨10.1103/PhysRevB.85.024406⟩. ⟨hal-00663175⟩
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