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TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.39: Poster

Monday, March 23, 2009, 13:00–16:45, P1A

Multi-orbital Dynamical Correlations in Iron Pnictides — •L. Craco — Max-Planck-Institut fuer Chemische Physik fester Stoffe

In view of the importance of dynamical correlations associated with electron interactions in Fe-pnictides, we will discuss our recent LDA+DMFT results for the correlated electronic structure of Sm- and La-based compounds [1,2]. We will show why multi-orbital electronic correlations are necessary for a concrete description of key physical responses found in their normal state. We present theory-experiment comparison of the one- and two-particle spectral functions. Such a comparison is required for deciding whether a given system is correlated, and if so, how strongly. Our study supports the view that superconductivity in Fe-pnictides arises from a bad metallic, incoherent normal state that is proximate to a Mott-Hubbard insulator.

[1] L. Craco, M. S. Laad, S. Leoni, and H. Rosner, Phys. Rev. B 78, 134511 (2008); and, Virtual Journal of Applications of Superconductivity 15, Issue 8 (2008).

[2] M.S. Laad, L. Craco, S. Leoni, and H. Rosner, arXiv:0810.1607.