title: Switching Ti valence in SrTiO3 by a dc electric field.
abstract: A (001) SrTiO3 wafer has been investigated in situ at room temperature under application of a static electric field of varying polarity by fluorescence x-ray absorption near edge structure (XANES) analysis at the Sr-K and Ti-K absorption edges. The XANES spectra show a clear shift of the Ti-K absorption edge energy. The shift is attributed to a change of the Ti valence state in a volume invoked by diffusion of the oxygen ions and vacancies. No shift was observed for the Sr-K absorption edge energy. Theoretical calculations support these findings.
authors.affiliation: Institut für Strukturphysik, Technische Universität Dresden, 01062 Dresden, Germany. leisegang@physik.tu-dresden.de
authors.forename: T
authors.initials: T
authors.lastname: Leisegang
authors.forename: H
authors.initials: H
authors.lastname: Stöcker
authors.forename: A A
authors.initials: AA
authors.lastname: Levin
authors.forename: T
authors.initials: T
authors.lastname: Weissbach
authors.forename: M
authors.initials: M
authors.lastname: Zschornak
authors.forename: E
authors.initials: E
authors.lastname: Gutmann
authors.forename: K
authors.initials: K
authors.lastname: Rickers
authors.forename: S
authors.initials: S
authors.lastname: Gemming
authors.forename: D C
authors.initials: DC
authors.lastname: Meyer