Affiliation: | (1) Institute of Physics, University Mainz, Staudingerweg 7, 55099 Mainz, Germany;(2) Institute of Physics, National Academy of Sciences of Ukraine, pr. Nauki 46, 03028 Kiev, Ukraine;(3) Institute of Solid State Research IFF-6 “Electronic Properties”, Research Centre Jülich, 52425, Jülich, Germany |