Electron doping by charge transfer at LaFeO3/Sm2CuO4 epitaxial interfaces.

Bruno, Flavio Y; Schmidt, Rainer; Varela, Maria; Garcia-Barriocanal, Javier; Rivera-Calzada, Alberto; Cuellar, Fabian A; Leon, Carlos; Thakur, Pardeep et al. · Adv Mater · 2013

basic_science · Level V

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Abstract

Using X-ray absorption spectroscopy and electron energy loss spectroscopy with atomic-scale spatial resolution, experimental evidence for charge transfer at the interface between the Mott insulators Sm2 CuO4 and LaFeO3 is obtained. As a consequence of the charge transfer, the Sm2 CuO4 is doped with electrons and thus epitaxial Sm2 CuO4 /LaFeO3 heterostructures become metallic.