1. Condensed Matter Simulation, Université de Liège, Sart-Tilman B4000, Belgium
2. Aix-Marseille University, CNRS, UMR7325, Marseille 13288, France
3. Institute of Physics 1A, Rheinisch-Westfälische Technische Hochschule Aachen, Aachen 52074, Germany
4. Consiglio Nazionale delle Richerche, Istituto di Scienze e Tecnologie Chimiche “Giulio Natta”, Milano 20133, Italy
5. Istituto Lombardo Accademia di Scienze e Lettere, Milano 20121, Italy
6. Peter-Grünberg-Institute (PGI 10), Forschungszentrum Jülich, Jülich 52428, Germany