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Light-induced charge transport in BaTiO3 via three charge states of rhodium

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Abstract

By combined studies of electron spin resonance and optical absorption at low temperatures, the charge-transfer bands of Rh5+ and Rh4+ are identified to be peaked near 1.6 and 1.9 eV, respectively. On this basis, the light-induced charge-transfer processes in BaTiO3:Rh are unraveled at room temperature. It is shown that three charge states of Rh are involved, leading to two levels: the shallow Rh4+/5+ and the deeper Rh3+/4+ level. The optical behaviour of these two levels corresponds to those expected from a ‘two-center’ model. The present paper represents the first atomic-scale identification of three charge states of one element leading to optical ‘two-level’ response.

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Authors and Affiliations

  1. Fachbereich Physik, Universität Osnabrück, D-49069, Osnabrück, Germany

    H. Kröse, R. Scharfschwerdt, O. F. Schirmer & H. Hesse

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  1. H. Kröse
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  2. R. Scharfschwerdt
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  3. O. F. Schirmer
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  4. H. Hesse
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Kröse, H., Scharfschwerdt, R., Schirmer, O.F. et al. Light-induced charge transport in BaTiO3 via three charge states of rhodium. Appl. Phys. B 61, 1–7 (1995). https://doi.org/10.1007/BF01090965

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  • DOI: https://doi.org/10.1007/BF01090965

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