Ivan Franko National University of Lviv, Department for Metal Physics, Kyrylo and Mephodii 8, Ua-79005 Lviv, Ukraine
Stepan Mudry
Ivan Franko National University of Lviv, Department for Metal Physics, Kyrylo and Mephodii 8, Ua-79005 Lviv, Ukraine
Paweł Kajak
Gdansk University of Technology, Department of Solid State Physics, Faculty of Applied Physics and Mathematics, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland