1. Institute of Low Temperature and Structure Research, PAS, Okólna 2, 50-422 Wrocław, Poland
2. Centre for Advanced Materials and Smart Structures, PAS, Okólna 2, 50-422 Wrocław, Poland
3. International Laboratory of High Magnetic Fields and Low Temperatures, PAS, Gajowicka 95, 53-421 Wrocław, Poland
4. Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland