Institution: | 1. A. F. Ioffe Physico‐Technical Institute, 194021 St. Petersburg, Russia;2. Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi Pr. 31, 199004 St. Petersburg, Russia;3. Institut fuer Experimentalphysik, Freie Universitaet Berlin, 14195 Berlin, Germany |