1. Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
2. Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, F-44000 Nantes, France
3. Institutul National de Cercetare-Dezvoltare pentru Tehnologii Izotopice si Moleculare, 400293 Cluj-Napoca, Romania