J. Kuneš,1,2,* L. Baldassarre,3 B. Schächner,3 K. Rabia,3 C. A. Kuntscher,3 Dm. M. Korotin,4 V. I. Anisimov,4 J. A. McLeod,5 E. Z. Kurmaev,4 and A. Moewes4 1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg 86135, Germany 2Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 53 Praha 6, Czech Republic 3Experimental Physics II, Institute of Physics, University of Augsburg, Augsburg 86135, Germany 4Institute of Metal Physics, Russian Academy of Sciences–Ural Division, 620041 Yekaterinburg GSP-170, Russia 5Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan, Canada S7N 5E2 Received 27 October 2009; published 28 January 2010