1. Institute for Theoretical Solid State Physics, Leibniz IFW Dresden, Helmholtzstraße 20, D-01069 Dresden, Germany
2. Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany
3. Institute of Applied Physics, MD 2028 Chişinǎu, R. Moldova