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Sci. Lett. J. 2014, 3: 55
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Research Article
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Full Text
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Complexity in the core level spectra of Ca1-xSrxRuO3
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Kalobaran Maiti, Ravi Shankar Singh§
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Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai - 400 005, India
§ Present Address: Indian Institute of Science Education and Research, Bhopal ITI (Gas Rahat) Building, Govindpura, Bhopal - 462 023, India
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Abstract |
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We investigate the core level spectra of Ca1-xSrxRuO3 employing high resolution photoemission spectroscopy. Sample surface appears to be dominated by the contributions from Ru-O layers. Sr 3p core level spectra are sharp and asymmetric in SrRuO3 as expected in a metallic system, and exhibit multiple features for the intermediate compositions that can be attributed to the difference in Ca-O and Sr-O covalency. The Ru core level spectra exhibit distinct signature of satellite features due to the finite electron correlations strength among Ru 4d electrons. The intensity of the satellite feature is weaker in the surface spectra compared to the bulk. The low temperature spectra exhibit enhancement of satellite intensity in the spectra corresponding to ferromagnetic compositions due to the inter-site exchange coupling induced depletion of the intensity at the Fermi level. The increase in x leads to a decrease in satellite intensity that has been attributed to the increase in hopping interaction strength due to the enhancement of the Ru-O-Ru bond angle. Evidently, the complex electronic properties of these materials are derived from the interplay between the electron correlation and hopping interaction strengths.
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Keywords
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Electron correlation; Electronic structure; Photoemission; Ruthenates
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