# Electron spectroscopic investigation of metal–insulator transition in $Ce_{1-x}Sr_xTiO_3$

Manju, U and Krishnakumar, SR and Ray, Sugata and Raj, S and Onoda, M and Carbone, C and Sarma, DD (2003) Electron spectroscopic investigation of metal–insulator transition in $Ce_{1-x}Sr_xTiO_3$. In: Journal of Chemical Sciences, 115 (5-6). pp. 491-498.

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Abstract. We have carried out detailed electron spectroscopic investigation of $Ce_{1–x}Sr_xTiO_3$ exhibiting insulator–metal transition with x. Core level X-ray photoelectron spectra of Ce 3d as well as resonant photoemission spectra obtained at the Ce $4d \rightarrow 4f$ resonant absorption threshold establish Ce as being in the trivalent state throughout the series. Using the ‘off-resonance’ condition for Ce 4f states, we obtain the Ti 3d dominated spectral features close to $E_F$, exhibiting clear signatures of coherent and incoherent peaks. We discuss the implications of our findings in relation to the metal–insulator transition observed in this series of compounds.