Journal
PHYSICAL REVIEW B
Volume 71, Issue 16, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.71.161102
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We investigate the electronic structure of 4d transition-metal oxides CaRuO3 and SrRuO3. The analysis of the photoemission spectra reveals significantly weak electron correlation strength (U/W similar to 0.2) as expected in 4d systems and resolves the long-standing issue that arose due to the prediction of large U/W similar to 3d systems. It is shown that the bulk spectra, thermodynamic parameters, and optical properties in these systems can consistently be described using first-principles calculations. The observation of different surface and bulk electronic structures in these weakly correlated 4d systems is unusual.
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