(LaCrO(3))(m)/SrCrO(3) superlattices as transparent p-type semiconductors with finite magnetization

The electronic and magnetic properties of (LaCrO(3))(m)/SrCrO(3) superlattices are investigated using first principles calculations. We show that the magnetic moments in the two CrO(2) layers sandwiching the SrO layer compensate each other for even m but give rise to a finite magnetization for odd m, which is explained by charge ordering with Cr(3+) and Cr(4+) ions arranged in a checkerboard pattern. The Cr(4+) ions induce in-gap hole states at the interface, implying that the transparent superlattices are p-type semiconductors. The availability of transparent p-type semiconductors with finite magnetization enables the fabrication of transparent magnetic diodes and transistors, for example, with a multitude of potential technological applications.