1. Amirkhanov Institute of Physics, DFRC of RAS, 367003 Makhachkala, Russia
2. Institute of Low Temperature and Structure Research, PAS, 50-950 Wroclaw, Poland
3. Instituto de Física, Universidade Federal Fluminense, Campus da Praia Vermelha, 24210-346 Niterói, RJ, Brazil
4. L.V. Kirensky Institute of Physics SB RAS, 660036 Krasnoyarsk, Russia
5. Department of Physics, Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea
6. Department of Physics, University of South Florida, 4202 East Fowler Avenue Tampa, Florida 33620, USA