Abstract
The totally symmetric and Jahn-Teller vibrations due to a Mn2+ impurity in cubic fluoroperovskites are explored by means of Density Functional calculations on 21 atom clusters. In addition to reproduce the experimental Mn2+-F- distances at zero pressure, Re, the present calculations indicate that on passing from KMgF3:Mn2+ (Ro=2.06Å) to CsCdF3:Mn2+ (R0=2.15Å) both ωE and ωA are reduced by about 45%. As salient feature this huge reduction is found to be practically twice that calculated for a system like KMgF3:Mn2+ when the equilibrium distance is forced to change 9 pm due to an applied hydrostatic pressure. Therefore this result stresses that though chemical and hydrostatic pressures produce the same effects on the electronic properties of a localized center in an insulating material, this conclusion is not necessarily true when local vibrations are considered. The relevance of this result with regard to the Stokes shift is discussed.
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© 2001 Springer Science+Business Media Dordrecht
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Barriuso, M.T., Moreno, M., Aramburu, J.A. (2001). Jahn-Teller and A1g Vibrations for Mn2+ Doped Fluoroperovskites: Stokes Shift. In: Kaplan, M.D., Zimmerman, G.O. (eds) Vibronic Interactions: Jahn-Teller Effect in Crystals and Molecules. NATO Science Series, vol 39. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0985-0_43
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DOI: https://doi.org/10.1007/978-94-010-0985-0_43
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