1. Department
of Physics and Earth Sciences, University of Ferrara, 44121 Ferrara, Italy
2. Department
of Physics, Informatics and Mathematics, University of Modena and Reggio Emilia, 41100 Modena, Italy
3. Max-Plank Institute for Solid State Research, 70569 Stuttgart, Germany
4. Institute
of Science and Technology for Ceramics, CNR-ISTEC 48018 Faenza, Italy
5. Nanotechnology Living Lab (NTLL) at Dhitech, 73100 Lecce, Italy
6. Tozzi Renewable Energy, 48123 Ravenna, Italy