Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Série SEM-BESSON
Domaines cond-mat
Date Lundi 11 Mai 2009
Heure 10:30
Institut IMPMC
Salle Salle de Conférence, Bâtiment 15,140 rue de Lourmel, 75015 Paris
Nom de l'orateur Mazin
Prenom de l'orateur Igor
Addresse email de l'orateur
Institution de l'orateur Naval Research Laboratories
Titre Electronic structure, superconductivity and magnetism in ferropnictides
Résumé There is growing evidence that the newly discovered high-Tc superconductivity in ferropnictides is intimately related to their unique magnetic properties. In the first part of the talk I will discuss the electronic structure of ferropnictides as it emerges from the density functional calculations, and will show that this electronic structure strongly favors a new unconventional superconducting state with an s-wave angular dependence of the gap, but with a sigh-changing order parameter. I will also discuss experimental evidence for and against this state, as well as potential experiments that can provide decisive evidence to this effect. In the second part of the talk I will argue for strong incipient antiferromagnetism in both parent and superconducting ferropnictides and discuss several hypotheses about why this strong magnetism has not been observed, or observed at a much weaker level, in the available experiments.
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