Abstract
The crystallographic superstructures were investigated for charge-orbital ordered manganites, Nd1-xSr1+xMnO4 (x=2/3, 3/4), by low-temperature high-resolution electron microscopy. Transverse and sinusoidal structural modulations were successfully observed in the images at 80 K. The observation implies that a new kind of“Wigner-crystal”model accompanied with a charge-density wave of eg electrons best explains the charge-orbital ordered state.
