1. Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India
2. Institute for Solid state Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
3. Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan
4. Elettra Sincrotrone Trieste ScPA, Strada Statale 14, km 163.5, Basovizza 34149, Trieste, Italy
5. Department of Chemistry, Centre for Materials Science and Nanotechnology, University of Oslo, Blindern, P.O. Box 11126, 0318 Oslo, Norway
6. National Physical Laboratory (CSIR), Dr. K. S. Krishnan Road, New Delhi 110012, India