Magnetization Measurement and 55Mn NMR Study of La(Ni1-xMgx)0.5Mn0.5O3

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  • Sonobe Masanobu
    Department of Applied Physics and Chemistry, The University of Electro-Communications
  • Asai Kichizo
    Department of Applied Physics and Chemistry, The University of Electro-Communications

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  • Magnetization Measurement and <SUP>55</SUP>Mn NMR Study of La(Ni<SUB>1−<I>x</I></SUB>Mg<I><SUB>x</SUB></I>)<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3</SUB>
  • Magnetization Measurement and 55Mn NMR
  • Magnetization Measurement and<sup>55</sup>Mn NMR Study of La(Ni<sub>1-<i>x</i></sub>Mg<sub><i>x</i></sub>)<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3</sub>

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Magnetization measurement and 55Mn NMR study on a ferromagnet system La(Ni1−x2+Mgx2+)0.5Mn0.54+O3 are made. The divalent and the tetravalent ions are found to be ordered to a considerable extent in the whole compositional range, and the ferromagnetic superexchange interactions between neighboring Mn4+ and Ni2+ ions are estimated to be 26 K in magnitude. 55Mn NMR signals are observed for samples with x≤0.6 in a frequency range between 270 and 310 MHz. The spectra composed of several equidistantly separated peaks can be successfully interpreted as each peak being the signal from Mn4+ surrounded by a specific number of Ni2+ ions. The hyperfine magnetic field at 55Mn supertransferred from a neighboring Ni2+ ion is determined to be 6.3 kOe, and the field originating from the own 3d magnetic moment of Mn4+ ion is estimated to be −295 kOe, being a typical value for Mn4+ ions in oxides.

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