Dpto. Fisica de Materiales Basque Country University, UPV/EHU, San Sebastian, Donostia-San Sebastian, Spain
J. J. del Val
Dpto. Fisica de Materiales Basque Country University, UPV/EHU, San Sebastian, Donostia-San Sebastian, Spain
M. Ipatov
Dpto. Fisica de Materiales Basque Country University, UPV/EHU, San Sebastian, Donostia-San Sebastian, Spain
M. Ilyn
Dpto. Fisica de Materiales Basque Country University, UPV/EHU, San Sebastian, Donostia-San Sebastian, Spain
A. Granovsky
Moscow State University, Faculty of Physics, Russian Federation and Dpto. Fisica de Materiales, Basque Country University, UPV/EHU San Sebastian, Moscow, Russia