Affiliation: | 1. Department of Physics, Giresun University, 28100 Giresun, Turkey;2. Department of Physics, A?r? ?brahim Çeçen University, 04100 A?r?, Turkey;3. Department of Physics, Bingöl University, 12000 Bingöl, Turkey;4. Department of Physics, Atatürk University, 25240 Erzurum, Turkey |