Visualization of hybridization states with atomic resolution using electron energy loss spectroscopy mapping

Abstract

Hybridization state mapping with atomic resolution was demonstrated using electron energy loss spectroscopy combined with scanning transmission electron microscopy. The O 2p states hybridized with Sn 5s and Cu 3d in a layered double perovskite La2CuSnO6 were individually distinguished by significant contrast differences in the oxygen K-edge energy-loss near-edge structure. The anisotropic oxygen intensity in the distorted CuO6 octahedron resulting from the Jahn-Teller effect could also be observed. The localized Cu 3d hole in the bc plane was indirectly imaged in real space using two-dimensional oxygen mapping.