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Strongly correlated electrons: Estimates of model parameters

The determination of renormalized parameters in model Hamiltonians is discussed. A simple model of a 3d compound is studied, and it is shown how higher states can be projected out, resulting in a simpler model with renormalized parameters. This is applied to the calculation of effective Coulomb integrals for 3d and 4f compounds. Effects left out in this approach are discussed. We then focus on fullerides and compare theoretical and experimental data for the Coulomb interaction and the electron-phonon strength.

preprint2012arXivOpen access
Olle Gunnarsson
cond-mat.str-elcond-mat.mtrl-sci
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Olle Gunnarsson

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