Surface Chemical Binding States of NO-Intercalated La_1.5Ba_0.5SrCu₂O_6-δ

Abstract

The surface chemical binding states of NO-intercalated La_1.5Ba_0.5SrCu₂O_6-δ were investigated by X-ray photo-electron spectroscopy (XPS) analysis. The N1s XPS spectra suggested the occurrence of surface adsorption of NO₂^- and NO₃^- groups. The chemical shift of the Cu2p XPS peak indicated decreasing hole concentrations at the level of O2p with NO intercalation in contrast to the case of LaBaSrCu₂O_6-δ. In addition, the surface intercalation of NO-produced a chemical shift of the Ba3d and Sr3d XPS peaks. These results suggested that the Ba content affected the surface groups on the cuprates.