Abstract
The orbital-charge-spin ordering phase diagram for half-doped perovskites (Ln rare earth) with ordered cations has been investigated comparatively with that of the solid-solution analogs. A large modification of the phase diagram is observed upon the -site disordering near the original bicritical point between the charge-orbital ordering and ferromagnetic metallic phases. The random potential by quenched disorder inherent in the -site solid solution is found to suppress the respective long-range orders and gives rise to the colossal magnetoresistive state.
- Received 3 September 2002
DOI:https://doi.org/10.1103/PhysRevLett.90.177203
©2003 American Physical Society