Affiliation: | 1. A. Che?kowski Institute of Physics , University of Silesia , 40-007 Katowice, Uniwersytecka 4, Poland aleonars@us.edu.pl;3. Institut für Festk?perforschung , Forschungszentrum Jülich, Jülich 52425, Germany;4. A. Che?kowski Institute of Physics , University of Silesia , 40-007 Katowice, Uniwersytecka 4, Poland |