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Séminaire MCBT

Mardi 12 février à 11h ,
Salle Louis Weil, E424

Orateur : Anna Galler (Centre de Physique Théorique, Ecole Polytechnique, Palaiseau)
"Electronic correlations in potential new rare-earth permanent magnet materials"

Abstract

Identifying or even designing new materials for permanent magnet applications is currently a very active field of research. While, at present, the best permanent magnets are based on the expensive rare-earth elements Nd, Sm or Dy (e.g. Nd2Fe14B), efforts are made to replace them with more available elements like Ce, with the hope to discover compounds with even better performance and lower material costs. Theoretical efforts to assist this quest encounter intriguing challenges related to the correlated nature of the rare-earth 4f states. In particular, in the family of potential Ce-based permanent magnet materials a key question is the localized vs. heavy-fermion behavior of the Ce-4f electrons. In this talk, I will present a theoretical method – the dynamical mean-field theory – which is suitable to address the correlated nature of the Ce-4f states. I will use this method in combination with density functional theory in order to investigate the magnetic properties of the potential hard-magnetic materials CeFe12, CeFe11Ti and CeFe11TiN from first principles.

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