Local Magnetic Field of a Perovskite Manganite La0.7Ca0.3MnO3

Abstract

The time-differential perturbed angular correlation method with the 140Ce probe was applied to a microscopic investigation on a perovskite manganite, La07Ca03Mn03. A drastic change was observed in the time evolution of the directional anisotropies around the Curie temperature (Tc•`245K), reflecting the paramagnetic-ferromagnetic phase transition. The internal magnetic field at the probe nucleus stabilized at the A site was estimated to be Bint= 6.9•}0.3T at 240K, whereas no appreciable magnetic field was observed at 260 K. From a comparative study using two different probe-introduction methods, in addition, we found that ascendant ions of the probe, 140Ba and 140La , can be located at the A site by heat treatment.