1. Prokhorov General Physics Institute of RAS, Vavilov Str. 38, 119991 Moscow, Russia
2. Frantsevich Institute for Problems of Materials Science, NAS, Krzhyzhanovsky Str. 3, 03680 Kiev, Ukraine
3. Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia
4. Lebedev Physical Institute of RAS, Leninskii pr. 53, 119991 Moscow, Russia
5. Vereshchagin Institute of High Pressure Physics of RAS, Troitsk, 142190 Moscow, Russia