1. B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Nauky Ave., Kharkiv 61103, Ukraine
2. Joint Institute for Nuclear Research, Dubna 141980, Russia
3. M.N. Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Yekaterinburg 620108, Russia and Ural Federal University, Yekaterinburg 620002, Russia
4. Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
5. Scientific-Practical Material Research Center, National Academy of Sciences of Belarus, Minsk 220072, Belarus