1. Department of Physics, Kastamonu University, 37100 Kuzeykent, Kastamonu, Turkey
2. Applications and Research Center for Advanced Studies, Istanbul Aydin University, 34295 Sefakoy, Istanbul, Turkey
3. Application and Research Center for Advanced Studies, Istanbul Aydin University, 34295 Sefakoy, Istanbul, Turkey
4. Department of Physics, Ankara University, 06100 Tandogan, Ankara, Turkey