Abstract
nanoparticles (average diameter and ) are synthesized by the polymeric precursor sol-gel method and characterized by various physico-chemical techniques. Quite strikingly, in the particles, the charge-ordered (CO) and the antiferromagnetic phases observed in the bulk below and , respectively, are completely absent. Instead, a ferromagnetic (FM) transition is observed at followed by an insulator-to-metal transition at . The particles show a residual CO phase but a transition to the FM state also occurs, at a slightly higher temperature of .
- Received 10 July 2006
DOI:https://doi.org/10.1103/PhysRevB.74.144416
©2006 American Physical Society