1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 117333, Russia
2. Institute of Radioengineering and Electronics, Russian Academy of Sciences, sq. Vvedensky 1, Fryazino, Moscow range, 141120, Russia
3. Research Institute for Technical Physics and Materials Science, Hungarian Academy of Sciences, P.O. Box 49, 1525 Budapest 114, Hungary