1. Nanostructured Composite Materials Laboratory, Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India
2. Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 12271, Saudi Arabia
3. Center for Hybrid Nanostructures (CHyN) and Fachbereich Physik, Universitat Hamburg, Hamburg 20146, Germany