Electronic structure and metal-insulator transition in SrTi
1 - x
Ru xO 3 |
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| Authors: | M Abbate JA Guevara SL Cuffini YP Mascarenhas E Morikawa |
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| Institution: | (1) Departamento de Fısica, Universidade Federal de Paraná, Caixa Postal 19091, 81531-990 Curitiba PR, Brazil, BR;(2) Instituto de Fısica de S ao Carlos, Universidade de S ao Paulo, Av. Dr. C. Botelho 1465,13560-250 S ao Carlos SP, Brazil, BR;(3) Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, LA 70806, USA, US |
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| Abstract: | We studied the changes in the electronic structure of SrTi1-xRuxO3 across the metal-insulator transition. The parent compound, SrTiO3, is a well known diamagnetic insulator; whereas the doped compound, SrTi1-xRuxO3, becomes a ferromagnetic metal above x
C
= 0.35. The techniques used in the study were photoemission (PES) and O 1
s X-ray absorption (XAS) spectroscopy. The experimental spectra were analyzed in terms of band structure and Hubbard model
calculations. The PES and XAS spectra of SrTi1-xRuxO3 show the Ru 4
d bands growing in the band gap of SrTiO3 . The analysis in terms of the Hubbard model indicates that the Ti 3
d and Ru 4
d bands are mostly decoupled. This suggests that the metal-insulator transition is a percolation transition like that of metals
embedded in a rare gas matrix. Electron correlation effects are present in this system, but they do not seem to play a major
role in the transition.
Received 10 September 2001 |
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| Keywords: | PACS 79 60 Bm Clean metal semiconductor and insulator surfaces – 78 70 Dm X-ray absorption spectra – 71 30 +h Metal-insulator transitions and other electronic transitions |
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