From calculations using ab initio density-functional methods, the authors show that analogous to the much-studied polar interface, there also forms a two-dimensional electron gas at the (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 electrons from the side to the 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.
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