%0 Journal Article
%T Raman spectroscopy study of the interface structure in (CaCuO2)n/(SrTiO3)m superlattices
%A D. Di Castro
%A S. Caramazza
%A D. Innocenti
%A G. Balestrino
%A C. Marini
%A P. Dore
%A P. Postorino
%J Physics
%D 2013
%I arXiv
%R 10.1063/1.4828358
%X Raman spectra of CaCuO2/SrTiO3 superlattices show clear spectroscopic marker of two structures formed in CaCuO2 at the interface with SrTiO3. For non-superconducting superlattices, grown in low oxidizing atmosphere, the 425 cm-1 frequency of oxygen vibration in CuO2 planes is the same as for CCO films with infinite layer structure (planar Cu-O coordination). For superconducting superlattices grown in highly oxidizing atmosphere, a 60 cm-1 frequency shift to lower energy occurs. This is ascribed to a change from planar to pyramidal Cu-O coordination because of oxygen incorporation at the interface. Raman spectroscopy proves to be a powerful tool for interface structure investigation.
%U http://arxiv.org/abs/1308.5616v2