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Title: The essential interactions in oxides and spectral weight transfer in doped manganites
Authors: Alexandrov, A.S.
Bratkovsky, A.M.
Issue Date: 1999
Abstract: We calculate the value of the Frohlich electron-phonon interaction in manganites, cuprates, and some other charge-transfer insulators and show that this interaction is much stronger than any relevant magnetic interaction. A polaron shift due to the Frohlich interaction, which is about 1 eV, suggests that carriers in those systems are small (bi)polarons at all temperatures and doping levels, in agreement with the oxygen isotope effect and other data. An opposite conclusion, recently suggested in the literature, is shown to be incorrect. The frequency and temperature dependence of the optical conductivity of ferromagnetic manganites is explained within the framework of the bipolaron theory.
Description: This is a pre-print. It is also available at: http://arxiv.org/abs/cond-mat/9908183. The definitive version: ALEXANDROV and BRATKOVSKY, 1999. The Essential Interactions in Oxides and Spectral Weight Transfer in Doped Manganites. Journal of Physics: Condensed Matter, 11(48), L531-L539, is available at: http://www.iop.org/EJ/journal/JPhysCM.
URI: https://dspace.lboro.ac.uk/2134/1205
Appears in Collections:Pre-Prints (Physics)

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