1. Department of Physical and Chemical Sciences University of L'Aquila via Vetoio L'Aquila 67100 Italy
2. Consiglio Nazionale delle Ricerche (CNR)‐Istituto Officina dei Materiali (IOM) Laboratorio TASC in Area Science Park S.S. 14 km 163.5 Trieste 34149 Italy
3. Charles University V Holesovickaˇch 2, Prague 8 Prague 18000 Czechia
4. Elettra‐Sincrotrone S.C.p.A S.S. 14‐km 163.5 in AREA Science Park Trieste 34149 Italy
5. Department of Industrial and Information Engineering and Economics University of L'Aquila Via G. Gronchi 18, 7 L'Aquila I‐67100 Italy
6. Department of Physics Faculty of Sciences Atatürk University Erzurum 25240 Turkey
7. Basic Sciences Department Faculty of Sciences Erzurum Technical University Erzurum 25050 Turkey
8. CNR‐SPIN Uos L'Aquila Via Vetoio 10 L'Aquila I‐67100 Italy
9. College of Science Institute of Materials Physics and Chemistry Nanjing Forestry University Nanjing 210037 P. R. China
10. Theoretical Physics and Applied Mathematics Department Ural Federal University Mira Street 19 Ekaterinburg 620002 Russia
11. CNR‐IMM Istituto per la Microelettronica e Microsistemi VIII strada 5 Catania I‐95121 Italy