原文如下The V-I curves of the Nd0.7Ca0.3MnO3 sample change from
linear to nonlinear behavior at temperatures below the charge ordering.
另Doped manganites with perovskite structures of formula
R1−xAxMnO3 (R=rare earth element, A=alkaline earth element
) have recently attracted considerable attention owing to
their especially strong competitive interactions, which are
responsible for colossal magnetoresistance, insulator-metal
transition, charge ordering (CO), and paramagneticferromagnetic
transition.还有Recent experiments have established that the CO state can be destabilized,
melted, or collapsed into a metallic state by various
means.