Local Magnetic Field of a Perovskite Manganite La_<0.7>Ca_<0.3>MnO_3
The time-differential perturbed angular correlation method with the <SUP>140</SUP>Ce probe was applied to a microscopic investigation on a perovskite manganite, La<SUB>0.7</SUB>Ca<SUB>0.3</SUB>MnO<SUB>3</SUB>. A drastic change was observed in the time evolution of the directional anisotropies around the Curie temperature (T<SUB>c</SUB>∼245K), reflecting the paramagnetic-ferromagnetic phase transition. The internal magnetic field at the probe nucleus stabilized at the A site was estimated to be B<SUB>int</SUB>=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, <SUP>140</SUP>Ba and <SUP>140</SUP>La, can be located at the A site by heat treatment.
- Journal of Nuclear and Radiochemical Sciences
Journal of Nuclear and Radiochemical Sciences 8(2), 89-92, 2007-12-01
The Japan Society of Nuclear and Radiochemical Sciences