Charge ordering induced by phase separation in polycrystalline La0.7-xLuxSr0.3MnO3 perovskites

Multiphase separation with hexagonal (H), rhombohedral (R), and cubic (C) phase was observed in polycrystalline La0.7-xLuxSr0.3MnO3 series by high-resolution transmission electron microscopy. Particularly, in La0.25Lu0.45Sr0.3MnO3, an abnormal lattice distortion of R phase was confirmed by lattice parameter calculation from x-ray diffraction data, as a character of a charged ordered (CO) state. This CO state, a transitional state induced by the phase-separation process of cation-out diffusion, was identified by magnetization and electron spin resonance measurements. (C) 2004 American Institute of Physics.