http://repository.ias.ac.in/id/eprint/95841 2012-11-23T12:10:52Z info:eu-repo/semantics/descriptiveMetadata http://repository.ias.ac.in/95841/ Role of electron correlation and long range magnetic order in the electronic structure of Ca(Sr)RuO₃ Singh, Ravi Shankar Medicherla, V. R. R. Maiti, Kalobaran QC Physics The room temperature photoemission spectra collected at different surface sensitivities reveal qualitatively different surface and bulk electronic structures in CaRuO₃ and SrRuO₃. 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 SrRuO₃, while the bulk spectrum in CaRuO₃ remains almost the same down to the lowest temperature studied. Elsevier Science 2008 Article PeerReviewed Singh, Ravi Shankar ; Medicherla, V. R. R. ; Maiti, Kalobaran (2008) Role of electron correlation and long range magnetic order in the electronic structure of Ca(Sr)RuO3 Physica B: Condensed Matter, 403 (5-9). pp. 1398-1400. ISSN 0921-4526 http://www.sciencedirect.com/science/article/pii/S0921452607011647 10.1016/j.physb.2007.10.156 10.1016/j.physb.2007.10.156 info:eu-repo/semantics/humanStartPage