1. CEA/DEN/DEC Bat 352 Cadarache, 13108 Saint Paul lez Durance, France
2. SPMS, LRC Carmen, CNRS Centrale Supélec, 92295 Châtenay-Malabry, France
3. CEA DEN/DANS/DMN/SRMA/LA2M, 91191 Gif-sur-Yvette, France
4. Institut Laue-Langevin, 6 rue Jules Horowitz, B.P. 156, 38042 Grenoble cedex, France