Using a two-orbital model and Monte Carlo simulations, we investigate the effect of nonmagnetic B-site substitution on half-doped CE-type manganites. The lattice defects induced by this substitution destabilize the CE phase, which transforms into (1) the ferromagnetic (FM) metallic competing state, or (2) a regime with short-range FM clusters, or (3) a spin-glass state, depending on couplings and on the valence of the B-site substitution. While a C-type antiferromagnetic state is usually associated with an average eg charge density less than 0.5, the nonmagnetic B-site substitution that lowers the eg charge density is still found to enhance the FM tendency in our simulations. The present calculations are in qualitative agreement with experiments and provide a rationalization for the complex role of nonmagnetic B-site substitution in modulating the phase transitions in manganites.
@article{arxiv.0812.1922,
title = {Non-magnetic B-site Impurities Induce Ferromagnetic Tendencies in CE Manganites},
author = {Xiao Chen and Shuai Dong and Kefeng. Wang and J. -M. Liu and Elbio Dagotto},
journal= {arXiv preprint arXiv:0812.1922},
year = {2009}
}