1. 1st Institute of Physics Georg August University of Göttingen Friedrich‐Hund‐Platz 1 37077 Göttingen Germany
2. IPOC ‐ Functional Polymers Institute of Polymer Chemistry University of Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
3. Max Planck Institute for Solid State Research Heisenbergstraße 1 70569 Stuttgart Germany