1. Department of Physics “Ettore Pancini”, University of Naples “Federico II”, 80126 Naples, Italy
2. Faculty of Geotechnical Engineering, University of Zagreb, 42000 Varaždin, Croatia
3. Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy
4. Department of Molecular Medicine and Medical Biotechnology, University of Naples “Federico II”, 80131 Naples, Italy
5. CNR – SPIN (Institute for Superconductors, Oxides and other Innovative Materials and Devices), Piazzale V. Tecchio 80, 80125 Naples, Italy