1. Physics Department, Chelyabinsk State University, Chelyabinsk 454001, Russia
2. National University of Science and Technology "MISiS," Moscow 119049, Russia
3. Material Science, TU Darmstadt, Darmstadt 64287, Germany
4. ITMO University, St. Petersburg 197101, Russia
5. National Research South Ural State University, Chelyabinsk 454080, Russia
6. Faculty of Physics, Tver State University, Tver 170100, Russia