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Numerical quantification of the vibronic broadening of the SrTiO3 Ti L-edge spectrum



Keith Gilmore, Eric L. Shirley


The 2p5-3d1 excited state of the Ti4+ ion in SrTiO3 couples to e_g distortions of the oxygen cage leading to a Jahn-Teller splitting of the degenerate excited states, which are additionally broadened by a Franck-Condon emission of phonons. We quantify these contributions to the broadening of the spectral features of the Ti L-edge of SrTiO3 by solving a model Hamiltonian, taking parameters for the Hamiltonian from previous first-principles calculations. Evaluation of the model Hamiltonian indicates that this vibronic coupling accounts for the majority of the broadening observed for the L_3-edge, but only a minority of the L_2-edge spectral width. The calculations reveal that, with increasing temperature, the spectral features become increasingly asymmetric and the amount of vibronic broadening grows approximately linearly.
Journal of Physics: Condensed Matter


Spectral Broadening, Vibronic Coupling


Gilmore, K. and Shirley, E. (2010), Numerical quantification of the vibronic broadening of the SrTiO3 Ti L-edge spectrum, Journal of Physics: Condensed Matter, [online], (Accessed June 20, 2024)


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Created July 8, 2010, Updated November 10, 2018