Affiliation: | (1) Institute of Physical Metallurgy, Czechoslovak Academy of Sciences, Žižkova 22, CS-616 62 Brno, Czechoslovakia;(2) Institute of Experimental Physics, Slovak Academy of Sciences, Solovjevova 47, CS-043 53 Koŝice, Czechoslovakia;(3) Department of Experimental Physics, Safárik University, CS-041 54 Koŝice, Czechoslovakia;(4) Research Institute of the East Slovakian Iron and Steel Works, CS-044 54 Koŝice, Czechoslovakia |