[1] Norwegian Univ Sci & Technol, Dept Phys, NO-7491 Trondheim, Norway
[2] Tampere Univ Technol, Fac Nat Sci, Lab Phys, FI-33101 Tampere, Finland
[3] Forschungszentrum Julich, PGI 1, D-52425 Julich, Germany
[4] Forschungszentrum Julich, Julich Aachen Res Alliance HPC, D-52425 Julich, Germany