1. Lomonosov Moscow State University, 119991 Moscow, Russia
2. Tver State University, 170100 Tver, Russia
3. Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
4. Technische Universität Dresden, D-01062 Dresden, Germany
5. Faculty of Mathematics and Physics, Charles University, 12116 Prague, Czech Republic
6. Institute of Physics CAS, 18221 Prague, Czech Republic
7. Institute of Low Temperatures and Structure Research, PAS, 50-950 Wroclaw, Poland