Affiliation: | (1) Sevchenko Research Institute of Applied Physical Problems, Minsk, 220064, Belarus;(2) Institute of Solid-State Physics, Schiller University of Jena, D-07743 Jena, Germany;(3) Technical University, 20-618 Lublin, Poland;(4) Institute of Physics, Sklodowska-Curie University of Lublin, 20-031 Lublin, Poland |