E.T. Dilmieva - Post-graduate Student, Bauman MSTU; Junior Research Scientist, Kotelnikov IRE RAS (Moscow) E-mail: kelvit@mail.ru; V.V. Koledov - Dr.Sc. (Phys.-Math.), Leading Research Scientist, Kotelnikov IRE RAS (Moscow); Y.S. Koshkidko - Ph.D. (Phys.-Math.), Research Scientist, International Laboratory of Strong Magnetic Fields and Low Temperatures (Wroclaw, Poland)