1. B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Nauky Ave., Kharkiv 61103, Ukraine
2. W. Trzebiatowski Institute for Low Temperatures and Structure Research PAS, Okolna, 2 Box 1410, Wroclaw 50-950, Poland
3. L.F. Vereshchagin Institute for High Pressure Physics of the Russian Academy of Sciences, 14 Kaluzhskoe shosse, Troitsk 142190, Russia
4. A.A.Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences, 49 Leninsky pr., Moscow 119991, Russia