Electron spectroscopic investigation of metal-insulator transition in Ce1-𝑥Sr𝑥TiO3

Journal of Chemical Sciences

C Carbone¹  S R Krishnakumar1³  Sugata Ray³  M Onoda²  U Manju³  D D Sarma1 5³  S Raj³ 

[1] ISM-CNR sede distaccata Trieste S. S. 14, Km. 163.5 I-34012 Basovizza (TS), Italy$$;Institute of Physics, University of Tsukuba, Tennodai, Tsukuba, 305-8571, Japan$$;Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India$$

关键词: Photoemission;    metal-insulator transition;    Ce1-𝑥Sr𝑥TiO3;    strong correlation.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

We have carried out detailed electron spectroscopic investigation of Ce1-𝑥Sr𝑥TiO3 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 → 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 𝐸𝐹, 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.

【 授权许可】

Unknown