Abstract

X-ray Photoelectron Spectroscopy (XPS) and Ultraviolet Photoelectron Spectroscopy (UPS) techniques along with the Tight Binding Linear Muffin Tin Orbitals within Atomic Sphere Approximation (TB–LMTO–ASA) calculations have been used to obtain the electronic structure of ARuO 3 ( A=Ca,Sr and Ba) compounds. Structure of these compounds was refined using Rietveld fitting of the XRD data. (Ca,Sr)RuO 3 belong to orthorhombic perovskite oxides whereas BaRuO 3 belongs to complex hexagonal perovskite oxides. Structural data indicated strong Ru–Ru interactions in BaRuO 3 whereas no such indication in (Ca,Sr)RuO 3. UPS data show some structures in the conduction bands of (Ca,Sr)RuO 3 and show a flat, free electron like conduction band for BaRuO 3. UPS and LMTO data indicated a progressive increase in electron correlation strength in the series BaRuO 3–SrRuO 3–CaRuO 3.

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