1. Laboratoire National des Champs
Magnétiques Intenses, UPR 3228, CNRS-UJF-UPS-INSA, Grenoble and Toulouse, France
2. High Field Magnet Laboratory,
Institute of Molecules and Materials, Radboud University Nijmegen, Toernooiveld 7, NL-6525 ED Nijmegen, The Netherlands
3. Institute of Physics PAS Al. Lotników 32/46 PL-02-668 Warsaw, Poland
4. Braun Center for Submicrometer
Research, Weizmann Institute of Science, Rehovot 76100, Israel