1. Polish Academy of Sciences, High Pressure Research Center (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
2. Grenoble High Magnetic Field Laboratory, MPI/FKF-CNRS (GHMFL), 25, Avenue des Martyrs, Grenoble 38-042, France
3. Groupe d'Etude des Semiconducteurs, CNRS-UMR 5650, Universite de Montpellier 2, 12 Place Eugene Bataillon, Montpellier 24095, France
4. CRHEA-CNRS, rue B. Gregory, Sophia Antipolis, 06560 Valbonne, France, France
5. Warsaw University, Institute of Experimental Physics (IEP UW), Hoża 69, Warszawa 00-681, Poland
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