Depth dependence of itinerant character in Mn-substituted Sr3Ru2O7
  We present a core-level photoemission study of Sr3(Ru 1-xMnx)2O7, in which we monitor the evolution of the Ru-3d fine structure versus Mn substitution and probing depth. In both Ru 3d3/2 and 3d5/2 core levels we observe a clear suppression of the metallic features, i.e. the screened peaks, implying a sharp transition from itinerant to localized character already at low Mn concentrations. The comparison between soft and hard x-ray photoemission, which provides tunable depth sensitivity, reveals that the degree of localized/metallic character for Ru is different at the surface than in the bulk. 
G Panaccione, U Manju, F Offi, E Annese, I Vobornik, P Torelli, Z H   Zhu, M A Hossain, L Simonelli, A Fondacaro, P Lacovig,...
cond-mat.str-el