[1] Bharathiar Univ, BU DRDO Ctr Life Sci, Div Phys, Coimbatore 641046, Tamil Nadu, India
[2] Bharathiar Univ, Dept Phys, Solid State & Radiat Phys Lab, Coimbatore 641046, Tamil Nadu, India
[3] Kalasalingam Univ, Anand Nagar 626190, Krishnankoil, India
[4] Tohoku Univ, IMRAM, Aoba Ku, Sendai, Miyagi 9808577, Japan