Electron energy-loss spectroscopy study of a (LaMnO[sub 3])[sub 8](SrMnO[sub 3])[sub 4] heterostructure

Verbeeck, J.; Lebedev, O. I.; Van Tendeloo, G.; Silcox, J.; Mercey, B.; Hervieu, M.; Haghiri-Gosnet, A. M.
September 2001
Applied Physics Letters;9/24/2001, Vol. 79 Issue 13
Academic Journal
An epitaxially grown heterostructure consisting of alternating layers of LaMnO[sub 3] (8 unit cells) and SrMnO[sub 3] (4 unit cells) on a SrTiO[sub 3] substrate has been studied by a combination of electron energy-loss spectroscopy (EELS) and high-resolution transmission electron microscopy (HRTEM) on an atomic scale. Excitation edges of all elements are captured with subnanometer spatial accuracy, and parametrized to obtain chemical profiles. The fine-edge structure of O K and Mn L[sub 2,3] edges are interpreted as signatures of the local electronic structure and show a spatial modulation of the concentration of holes with O 2p character. The chemical concentration is found to be different for the bottom and top interface of a SrMnO[sub 3] layer. HRTEM complements the EELS results and confirms the asymmetry of the interfaces. © 2001 American Institute of Physics.


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