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Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 32: SC: Fe-based Superconductors - Theory

TT 32.7: Talk

Wednesday, March 16, 2011, 12:15–12:30, HSZ 304

Dichotomy between Large Local and Small Ordered Magnetic Moments in Iron-Based Superconductors — •Alessandro Toschi1, Philipp Hansmann1, Ryotaro Arita2, Shiro Sakai1, Giorgio Sangiovanni1, and Karsten Held11Institute for Solid State Physics, Vienna University of Technology, Austria — 2Department of Applied Physics, University of Tokyo, Japan

We study a four-band model for iron-based superconductors within the local density approximation combined with dynamical mean-field theory (LDA + DMFT). This successfully reproduces the results of models which take As p degrees of freedom explicitly into account and has several physical advantages over the standard five d-band model. Our findings[1] reveal that the new superconductors are more strongly correlated than their single-particle properties suggest. Two-particle correlation functions unveil the dichotomy between local and ordered magnetic moments in these systems, calling for further experiments to better resolve the short time scale spin dynamics.
P. Hansmann, R. Arita, AT, S. Sakai, G. Sangiovanni, K. Held, Phys. Rev. Lett. 104, 197002 (2010)

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