Abstract
Cu 2 O / La 0.7 Sr 0.3 MnO 3 is a promising heterostructure for the realization of all-oxide spintronics devices, with La0.7Sr0.3MnO3 (LSMO) and Cu2O playing the roles of ferromagnet and semiconductor, respectively. Here we use x-ray photoelectron spectroscopy and first principles calculations to determine the valence band offset at the Cu2O/LSMO interface. The interface band alignment is typical of a p-type semiconductor/metal contact, with an interface barrier of 0.3–0.5 eV depending on Cu2O thickness. The calculated energetics indicates that the prevailing interface is between SrO-terminated LSMO and Cu planes of Cu2O.
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