Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: SC: Fe-based Superconductors - Theory

TT 32.7: Vortrag

Mittwoch, 16. März 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 Held¹ — ¹Institute 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)