1. Dipartimento
di Fisica, Sapienza Università di Roma, Piazzale A. Moro
2, 00185 Roma, Italy
2. High Field Magnet Laboratory (HFML −
EMFL), Radboud University, Toernooiveld 7, NL-6525
ED Nijmegen, The Netherlands
3. Department of Electronic Materials Engineering, Research School of
Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia