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Résumé |
The discovery of high-temperature superconductivity in iron-based
compounds triggered an enormous amount of research in condensed matter
physics. Not even two years after their discovery, scientists have already collected a huge amount of experimental data. A very intriguing property of these new compounds is the high flexibility concerning elemental substitutions, leading to several families of superconductors, termed '1111', '122', '11', and so on, depending on their chemical composition.
This talk will be devoted to the analysis of the single-particle properties of
prominent iron-based superconductors using a combination of
density-functional theory with the Dynamical Mean-Field Theory, which enables us to understand also these more complex materials at a first-principle level. We will show that there are significant differences in the
electronic properties, when going from more weakly correlated members
as LaFeAsO, to more correlated ones like FeSe. For reasonable Coulomb
parameters, the properties range from Fermi-liquid like to incoherent
bad-metal like.
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