Affiliation: | 1. St. Petersburg State Polytechnical University, St. Petersburg, 195251, Russia 2. Max Planck Institute of Microstructure Physics, Weinberg 2, 06120, Halle (Saale), Germany 5. Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhni Novgorod, 603950, Russia 3. Martin-Luther-Universit?t Halle-Wittenberg, Interdisziplin?res Zentrum für Materialwissenschaften (IZM), Heinrich-Damerow-Str., 4, D-06120, Halle (Saale), Germany 4. Martin-Luther-Universit?t Halle-Wittenberg, Institut für Physik, Von-Danckelmann-Platz 3, D 06120, Halle (Saale), Germany
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