Metal-insulator transition in $(LaMnO_3)_{2n}/(SrMnO_3)_n$ superlattices
  The modulation of charge density and spin order in (LaMnO$_3$)$_{2n}$/(SrMnO$_3$)$_n$ ($n$=1-4) superlattices is studied via Monte Carlo simulations of the double-exchange model. G-type antiferromagnetic barriers in the SrMnO$_{3}$ regions with low charge density are found to separate ferromagnetic LaMnO$_{3}$ layers with high charge density. The recently experimentally observed metal-insulator transition with increasing $n$ is reproduced in our studies, and $n=3$ is found to be the critical value. 
Shuai Dong, Rong Yu, Seiji Yunoki, Gonzalo Alvarez, J.-M. Liu, and   Elbio Dagotto