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We have measured soft x-ray photoemission and O 1{\it s} x-ray absorptionspectra of Ca$_{1-x}$Sr$_x$RuO$_3$ thin films prepared {\it in situ}. Thecoherent and incoherent parts have been identified in the bulk component of thephotoemission spectra, and spectral weight transfer from the coherent to theincoherent part has been observed with decreasing $x$, namely, with increasingorthorhombic distortion. We propose that, while the Ru 4d one-electronbandwidth does not change with $x$, the distortion and hence the splitting ofthe $t_{2\text{g}}$ band effectively increases electron correlation strength.Although strong mass enhancement is found in the electronic specific heat data,the coherent part remains wide, suggesting enhanced band narrowing only in thevicinity of {\it E$_{F}$}

physical review. b, condensed matter and materials physics

Manifestation of correlation effects in the photoemission spectra of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant="normal">Ru</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></…

Manifestation of correlation effects in the photoemission spectra ofCa1−xSrxRuO3