1. Laboratoire
National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 143,
avenue de Rangueil, 31400 Toulouse, France
2. Institute
of Physics, Wroclaw University of Technology, 50-370 Wroclaw, Poland
3. Laboratoire
National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25,
avenue de Martyrs, 38042 Grenoble, France
4. Institute
for Nanoscience, CNR-NANO S3, via Campi 213/A, 41125 Modena, Italy
5. Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
6. Department
of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel