1. Department of Physics, Faculty of Science, University of Zagreb 1 , Bijenička Cesta 32, HR-10000 Zagreb, Croatia
2. Institute for Materials Research-UNAM, Ciudad Universitaria Coyoacan 2 , C.P. 04510, Mexico D.F., Mexico
3. Institute of Physics 3 , Bijenička Cesta 46, HR-10000 Zagreb, Croatia
4. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory 4 , Upton, New York 11973, USA
5. Department of Physics, Princeton University 5 , Princeton, New Jersey 08544, USA
6. Department of Physics, University of Osijek 6 , Trg Ljudevita Gaja 6, HR-31000 Osijek, Croatia
7. Faculty of Science, University of Sarajevo 7 , Zmaja od Bosne 35, 71000 Sarajevo, Bosnia and Herzegovina
8. Donostia International Physics Center 8 , 20018 Donostia-San Sebastian, Spain