1. Materials Science; Technische Universität Darmstadt; 64287 Darmstadt Germany
2. Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE); University Duisburg-Essen; 47057 Duisburg Germany
3. Dresden High Magnetic Field Laboratory (HLD-EMFL); Helmholtz-Zentrum Dresden-Rossendorf; 01328 Dresden Germany