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We investigate the nature and origin of the metal-insulator transition inSr2Ru1-xTixO4 as a function of increasing Ti content (x). Employing detailedcore, valence, and conduction band studies with x-ray and ultravioletphotoelectron spectroscopies along with Bremsstrahlung isochromat spectroscopy,it is shown that a hard gap opens up for Ti content greater than equal to 0.2,while compositions with x<0.2 exhibit finite intensity at the Fermi energy.This establishes that the metal-insulator transition in this homovalentsubstituted series of compounds is driven by Coulomb interaction leading to theformation of a Mott gap, in contrast to transitions driven by disorder effectsor band flling.Comment: Accepted for publication in Phys. Rev.

physical review. b, condensed matter and materials physics

Electron-spectroscopic investigation of the metal-insulator transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ru</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>Ti</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math><mml:math …

Electron-spectroscopic investigation of the metal-insulator transition inSr2Ru1−xTixO4