1. Division of Experimental Physics
2. Wrocław University of Science and Technology
3. 50-370 Wrocław
4. Poland
5. Institute of Physics
6. University of Silesia
7. PL-40-007 Katowice
8. Silesian Center for Education and Interdisciplinary Research
9. Institute of Low Temperature and Structure Research
10. Polish Academy of Sciences
11. 50-950 Wrocław 2