Magnetism

Magnetic properties of complex oxides Ba$_6$Ni$_{5-x}$Mn$_x$O$_{15}$ ($x$ = 2, 3, 4) of the $A_{3n+3m}A'_nB_{3m+n}$O$_{9m+6n}$ family

M. A. Melkozerova^a, E. V. Zabolotskaya^a, D. G. Kellerman^a, A. S. Semenova^a, E. Yu. Medvedev^b, G. V. Bazuev<sup>a

a</sup> Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, Ekaterinburg
^b Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg

Abstract: The magnetic interactions in the quasi-one-dimensional complex oxides Ba$_6$NiMn$_4$O$_{15}$, Ba$_6$Ni$_2$Mn$_3$O$_{15}$, and Ba$_6$Ni$_3$Mn$_2$O$_{15}$ have been investigated using electron paramagnetic resonance and magnetic susceptibility measurements. It has been revealed that, for the Ba$_6$Ni$_2$Mn$_3$O$_{15}$ and Ba$_6$Ni$_3$Mn$_2$O$_{15}$ compounds, the magnetic moments are considerably smaller than the theoretical values and depend on the temperature. The results obtained have been interpreted under the assumption that the structure contains Ni$^{3+}$ ions in which the energy level structure can lead to the above anomalies.

Received: 18.05.2010

 English version: Physics of the Solid State, 2011, 53:2, 323–328

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