1. Department of Physics, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel
2. High-Tc-Superconductivity Lab., Semiconductor Physics Institute, 01108 Vilnius, Lithuania
3. Department of Physics, Faculty of Natural Sciences, Vilnius Gediminas Technical University, LT-10223, Vilnius, Lithuania
4. Department of General and Inorganic Chemistry, Vilnius University, LT-03225 Vilnius, Lithuania
5. Department of Electrical Engineering and Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14627, USA