Reduction of Curie temperature and saturation magnetization in Ba2-xNaxFeMoO6

摘要

We investigated the role of carrier electrons on ferromagnetism in a half-metallic double perovskite Ba2FeMoO6 by means of a partial substitution of Na+ for Ba2+. Single-phase samples of Ba2-xNaxFeMoO6 are synthesized up to x = 0.6. The nonmetallic upturn in resistivity appears with the Na substitution, suggesting a reduction of the carrier doping level. Because of the observed decrease of both magnetoresistance and Curie temperature with x, the Na substitution negatively works for applicative performance. We will show, however, that the observed decrease of the saturation moment with x is of importance to advance understanding for the stabilization of ferromagnetism. (c) 2005 American Institute of Physics.