%0 Journal Article
%@ 0921-4526
%A Singh, Ravi Shankar
%A Medicherla, V. R. R.
%A Maiti, Kalobaran
%D 2008
%F ias:95841
%I Elsevier Science
%J Physica B: Condensed Matter
%K Photoemission; Correlated Electron Systems; Mott Insulator; Transition Metal Oxide
%N 5-9
%P 1398-1400
%R 10.1016/j.physb.2007.10.156
%T Role of electron correlation and long range magnetic order in the electronic structure of Ca(Sr)RuO<sub>3</sub>
%U http://repository.ias.ac.in/95841/
%V 403
%X The 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.
%Z Copyright of this article belongs to Elsevier Science.