1. Department of Physics, University of Washington, Seattle, Washington 98105, USA
2. Shubnikov Institute of Crystallography of Federal Scientific Research Centre, “Crystallography and Photonics” of Russian Academy of Sciences, Moscow 119333, Russia
3. Faculty of Engineering and Natural Sciences, Sabanci University, Orhanli/Tuzla, 34956 Istanbul, Turkey
4. Department of Materials Science and Engineering, Izmir Institute of Technology, Gulbahce/Urla, 35430 Izmir, Turkey