Fei Han, Xiangang Wan, Bing Shen, Hai-Hu Wen
A new compound with a quasi-two-dimensional array of FeSe3O tetrahedra and an orthorombic structure, namely BaFe2Se2O, has been successfully fabricated. Experimental results show that this compound is an insulator and has an antiferromagnetic (AF) transition at 240 K. Band structure calculation reveals that the honeycomb-like Fe sub-lattice is responsible for the narrowing of Fe 3$d$ bands near the Fermi energy, which leads to the localization of magnetism and the Mott insulating behavior. Linear response calculation further indicates a strong in-plane AF exchange $J$, this can account for the enhanced magnetic susceptibility (which has a maximum at about 450 K) above the Neel temperature.
View original:
http://arxiv.org/abs/1206.6154
No comments:
Post a Comment