MAGNETIZATION MEASUREMENTS AND MN-55 NMR-STUDIES OF LANI0.5MN0.5O3

Magnetization measurements and 55Mn NMR study of a system with the nominal formula LaNi1-x MnxO3 (0.0≤ x≤0.5) were made. It was found that materials with 0.03 ≤ x≤0.5 are mixtures of a Pauli paramagnet LaNiO3 and a ferromagnet LaNi0.5 Mn0.5 O3. The Curie temperature of LaNi0.5 Mn0.5 O3 was found to be 275 K. In this material, strong 55Mn NMR signals associated with Mn4+ were observed. The observed hyperfine magnetic fields are about -260 kOe, which is considerably smaller than the ones observed for the Mn4+ ions in other oxides. This smallness of the value seems to be due to the supertransferred hyperfine magnetic fields from the neighboring Ni2+ ions. © 1979, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.