Abstract
The layered structures of La 0.67 Sr 0.33 MnO 3 /SrTiO 3 superlattices have been investigated by energy filtered transmission electron microscopy (EFTEM) and spatially resolved electron energy loss spectroscopy (EELS). A general picture of the elemental distribution of the chemically modulated layers was given by the EFTEM images. Chemical shift in both Ti-L 2,3 and Mn-L 2,3 edges, together with an appearance of distinctive shoulders in both Mn-L 3 and Mn-L 2 edges at the interfacial region were observed. These electronic structure changes suggest a stronger crystal field and/or a partial loss of oxygen at the interfaces, accounting for the observed oscillatory exchange coupling and enhanced magnetoresistance in such superlattices.
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