Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: SC: Iron-Based Superconductors - Theoretical Approaches

TT 17.5: Talk

Tuesday, March 23, 2010, 15:15–15:30, H20

The Curious Iron Pnictides: A Mottness Point of View — •Mukul Laad¹ and Luis Craco² — ¹Institut für Theoretische Physik, RWTH Aachen D-52056, Aachen, Germany — ²MPI-CPfS, Nöthnitzer Strasse 40, 01187 Dresden, Germany

Based on perusal of various experiments, we propose that Fe pnictides are “bad metals” close to a Mott-Hubbard instability, as in the classic V₂O₃. First-principles LDA+DMFT calculations confirm this suspicion, giving excellent quantitative agreement with a host of one- and two-particle responses.

We have studied the instability of this “bad metal” to an unconventional SC, whose gap function has an admixture of extended-s and s_xy components. This, to our knowledge, is the first time that such an instability has been studied within LDA+DMFT.