Charge-ordered stripes in La1−xCaxMnO3 with x>0.5 (invited)

Charge-ordered stripes in ${\mathrm{La}}_{\text{1−x}}{\mathrm{Ca}}_x{\mathrm{MnO}}_3$ with $x$ >0.5 were studied by electron diffraction and electron microscopy. Charge-ordered domains were observed in dark-field images and the stripes within the domain were revealed by high resolution lattice images. The modulation wave vector δ of the charge ordering follows closely the relationship of $\text{δ=1−x}$ and shows a slight variation from area to area. The incommensurability of the charge ordering to the underlying fundamental lattice gives rise to the presence of discommensurations in the incommensurate phase. Configurations of discommensurations in this system do not follow the general rules observed in other incommensurate systems.