(La-139, Mn-55) NMR and magnetic susceptibility data on microscopic phase separation in La0.9MnO3 single crystal

Magnetic susceptibility of the La0.9MnO3 single crystal was measured and it s (La-139, Mn-55) NMR spectra were recorded. The data obtained indicate tha t the areas with an A-type antiferromagnetic order (T-N = 140 K) and magnet ic moments aligned with the b axis occupy a major part of the sample volume in manganite with a considerable concentration of cationic vacancies; simu ltaneously, the clusters with a canted magnetic sublattice and ferromagneti c interaction between magnetic moments are formed near the vacancies. Charg e distribution in these clusters is materially different from that in the a ntiferromagnetic areas. Magnetic state and relative concentration of the cl usters are discussed. (C) 2000 MAIK "Nauka/Interperiodica".