[1] B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, United Kingdom
[2] Kyiv National Taras Shevchenko University, Physical and Biological Faculties, 64 Volodymyrska Str., Kyiv 01601, Ukraine
[3] Technical University of Ilmenau, Institute of Physics, Laboratory of Chemistry, 09684 Ilmenau, Germany