Xu, P. [P:(DE-HGF)0] ; Rabel, E. [P:(DE-Juel1)144924] ; Zhang, W. [P:(DE-HGF)0] ; Mazzarello, R. [P:(DE-HGF)0] ; Zeller, R. [P:(DE-Juel1)131057] ; Blügel, S. [P:(DE-Juel1)130548]