[1] Jawaharlal Nehru Ctr Adv Sci Res, Int Ctr Mat Sci, Bangalore 560064, Karnataka, India
[2] Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India
[3] Savitribai Phule Pune Univ, Fergusson Coll, Dept Phys, Pune 411004, Maharashtra, India
[4] Indian Inst Sci, Undergratuate Program, Bangalore 560012, Karnataka, India