[1] Indian Inst Technol, Dept Phys, Bombay 400076, Maharashtra, India
[2] Indian Inst Technol, ACRE, Bombay 400076, Maharashtra, India
[3] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India
[4] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India
[5] CNRS, LMOV, Versailles, France