1. G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03680 Kyiv-142, Ukraine
2. A.V. Shubnikov Institute of Crystallography of RAS, 59 Leninskiy Ave., 119333 Moscow, Russia
3. National Science Center Kharkov Institute of Physics and Technology, NAS of Ukraine, 1, Akademicheskaya Str., 61108 Kharkov, Ukraine
4. Oak Ridge National Laboratory, Oak Ridge, 37831-6118 Tennessee, USA