Affiliation: | 1. Research Institute for Technical Physics and Materials Science, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49, Hungary;2. Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Praha, Czech Republic;3. Department of Materials Science and Engineering, Budapest University of Technology and Economics, H-1111 Budapest, Goldmann ter 3, Hungary |