Polar catastrophe and the spin-polarized electron gas at the $LaMnO3/SrMnO3$ interface Available to Purchase

From calculations using ab initio density-functional methods, the authors show that analogous to the much-studied polar $LaAlO3/SrTiO3$ interface, there also forms a two-dimensional electron gas at the $LaMnO3/SrMnO3$ (100) interface due to the polar catastrophe. The electron gas originates from the accumulation of half an electron per cell to quench the polar catastrophe and from the leakage of $Mn(eg)$ electrons from the $LaMnO3$ side to the $SrMnO3$ side. These electrons mediate a ferromagnetic double-exchange interaction between the Mn moments at the interface, causing the interface region to be ferromagnetic and in turn the electrons becoming spin-polarized owing to the Zeeman field of the Mn moments.