1. B. I. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Kharkiv 61103, Ukraine
2. The Faculty of Physics, V. N. Karazin Kharkiv National University, Kharkiv 61022, Ukraine
3. Institute for Low Temperatures and Structure Research, Polish Academy of Sciences, Wroclaw 50-422, Poland
4. Department of Electrical and Computer Engineering, University of Thessaly, Volos 38221, Greece
5. Department of Materials, Imperial College, London SW7 2AZ, United Kingdom