1. O. O. Galkin Donetsk Institute for Physics and Engineering of the National Academy of Sciences of Ukraine, Kyiv 03028, Ukraine
2. G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine, Kyiv 03142, Ukraine
3. Kyiv Academic University, Kyiv 03142, Ukraine
4. Vasyl’ Stus Donetsk National University, Vinnytsia 21021, Ukraine