Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 25: Focussed session: Frontiers of electronic structure theory: Strong correlations from first principles II (jointly with TT)

O 25.1: Topical Talk

Dienstag, 27. März 2012, 10:30–11:00, HE 101

Iron Pnicitdes and Chalchogenides: a New Class of Strongly Correlated Electron Systems. — •Gabriel Kotliar — Rutgers University Piscataway NJ

The discovery of superconductivity in the iron pnictides and chalchogenides took the scientific community by surprise. Since then many tools have been applied to these systems, and many competing physical pictures have been proposed.

In this talk will argue that compounds in this family should be thought as Hund's metals, a new class of strongly correlated materials where the correlations are controlled by the strength of the Hund's rule coupling J rather than by the Hubbard U. While correlations in these materials are strong, their physical properties are strikingly different from that of transition metal oxides.

In support of this picture we will present several LDA+DMFT studies for various observables stressing the role of various spectroscopies such as optical conductivity, photoemission and inelastic neutron scattering.