Affiliation: | 1. Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany;2. Helmholtz Zentrum Dresden Rossendorf, P.O. Box 510119, 01314 Dresden, Germany, and, Technische Universit?t Dresden, 01062 Dresden, Germany;3. Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany |