Publications of the IAS FellowsRole of electron correlation and long range magnetic order in the electronic structure of Ca(Sr)RuO<sub>3</sub>Ravi ShankarSinghauthorV. R. R.MedicherlaauthorKalobaranMaitiauthorThe room temperature photoemission spectra collected at different surface sensitivities reveal qualitatively different surface and bulk electronic structures in CaRuO<sub>3</sub> and SrRuO<sub>3</sub>. The extracted bulk spectra are dominated by the coherent feature intensity with a weak correlation induced feature at higher binding energies. The First principle calculations provide a wonderful representation of the bulk spectra for the effective electron correlation strength, U/W∼0.2 as expected for highly extended 4d systems. This resolves a long-standing issue that arose due to the prediction of large U/W similar to 3d systems. Photoemission spectra across the magnetic phase transition reveal unusual evolution exhibiting a large reduction in the coherent feature intensity in the bulk spectrum of SrRuO<sub>3</sub>, while the bulk spectrum in CaRuO<sub>3</sub> remains almost the same down to the lowest temperature studied.QC Physics2008Elsevier ScienceArticle

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