Hyperfine magnetic fields at the nuclei of probe ¹¹⁹Sn atoms and exchange interactions in the CaCu₃Mn_3.96Sn_0.04O₁₂ manganite

Viyacheslav S. Rusakov (1) , Igor Presniakov (1) , Alexey Sobolev (1) , Gérard Demazeau (2) , Tatyana V. Gubaidulina (1) , M. E. Matsnev (1) , M. A. Gapochka (1) , O. S. Volkova (1) , A. N. Vasilev (1)

1 Moscow State University
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

We have investigated the hyperfine magnetic interactions between the nuclei of probe ¹¹⁹Sn atoms in the CaCu₃Mn_3.96Sn_0.04O₁₂ double manganite by Mössbauer spectroscopy using magnetic measurements. A consistent description of the results obtained in terms of the Weiss molecular field model by taking into account the peculiarities of the local environment of tin atoms has allowed the indirect Cu²⁺-O-Mn⁴⁺ (J _CuMn ≈ −51 ± 1 K) and Mn⁴⁺-O-Mn⁴⁺ (J _MnMn ≈ −0.6 ± 0.6 K) exchange interaction integrals to be estimated. Based on the Kanamori-Goodenough-Anderson model, we show that the magnitude and sign of the intrasublattice exchange integral J _MnMn correspond to both the electronic configuration of the Mn⁴⁺ cations and the geometry of their local crystallographic environment in the compound under study.

Domaines: Matériaux

Viyacheslav S. Rusakov, Igor Presniakov, Alexey Sobolev, Gérard Demazeau, Tatyana V. Gubaidulina, et al.. Hyperfine magnetic fields at the nuclei of probe ¹¹⁹Sn atoms and exchange interactions in the CaCu₃Mn_3.96Sn_0.04O₁₂ manganite. Journal of Experimental and Theoretical Physics (JETP) / Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki, 2011, 112 (4), pp.617-624. ⟨10.1134/S1063776111030149⟩. ⟨hal-00598702⟩