1. Department of Physics Gebze Technical University Gebze Kocaeli 41400 Turkey
2. Laboratory of Physical Methods of Solid State Investigation Institute of Applied Problems in Physics Academiei str. 5 Chisinau MD 2028 Moldova
3. LIMMS/CNRS‐IIS (IRL2820) International Collaborative Research Center Institute of Industrial Science The University of Tokyo 4-6-1 Komaba Meguro‐ku Tokyo 153-8505 Japan
4. Department of Physics Kocaeli University Kocaeli 41380 Turkey