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- W2093025377 abstract "In this study, we report on investigations of the electronic structure of SrTiO$_3$ annealed at temperature ranging between 550 and 840$^circ$C in an ultrahigh vacuum. Annealing induced oxygen vacancies (O$_{vac}$) impart considerable changes in the electronic structure of SrTiO$_3$. Using core-level photoemission spectroscopy, we have studied the chemical potential shift ($Deltamu$) as a function of annealing temperature. The result shows that the chemical potential monotonously increases with electron doping in SrTiO$_{3-delta}$. The monotonous increase of the chemical potential rules out the existence of electronic phase separation in the sample. Using valence band photoemission, we have demonstrated the formation of a low density of states at the near Fermi level electronic spectrum of SrTiO$_{3-delta}$. The gap-states were observed by spectral weight transfer over a large energy scale of the stoichiometric band gap of SrTiO$_3$ system leading finally to an insulator - metal transition. We have interpreted our results from the point of structural distortions induced by oxygen vacancies." @default.
- W2093025377 created "2016-06-24" @default.
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- W2093025377 date "2014-08-07" @default.
- W2093025377 modified "2023-10-14" @default.
- W2093025377 title "Chemical potential shift and gap-state formation in SrTiO3−<i>δ</i> revealed by photoemission spectroscopy" @default.
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- W2093025377 doi "https://doi.org/10.1063/1.4892397" @default.
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